NUREG/IA-0135

CAMP006

International

Agreement Report

Post-Test Analysis of PIPER-ONE

PO-IC-2 Experiment by

RELAP5/MOD3 Codes

Prepared by

R. Bovalini, F. D'Auria, G. M. Galassi, M. Mazzini

University of Pisa

Via Diotisalvi, 2

1-56126 Pisa

Italy

Office of Nuclear Regulatory Research

U.S. Nuclear Regulatory Commision

Washington, DC 20555-0001

November 1996

Prepared as part of

The Agreement on Research Participation and Technical Exchange

under the International Thermal-Hydraulic Code Assessment

and Maintenance Program (CAMP)

Published by

U.S. Nuclear Regulatory Commission
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NUREG/IA-0135

CAMP006

International

Agreement Report

Post-Test Analysis of PIPER-ONE

PO-IC-2 Experiment by

RELAP5/MOD3 Codes

Prepared by

R. Bovalini, E D'Auria, G. M. Galassi, M. Mazzini

University of Pisa

Via Diotisalvi, 2

1-56126 Pisa

Italy

Office of Nuclear Regulatory Research

U.S. Nuclear Regulatory Commision

Washington, DC 20555-0001

November 1996

Prepared as part of

The Agreement on Research Participation and Technical Exchange

under the International Thermal-Hydraulic Code Assessment

and Maintenance Program (CAMP)

Published by

U.S. Nuclear Regulatory Commission

ABSTRACT

RELAP5/MOD3.1 was applied to the PO-IC-2 experiment performed in PIPER-ONE facility,

which has been modified to reproduce typical isolation condenser thermal-hydraulic conditions.

RELAP5 is a well known code widely used at the University of Pisa during the past seven years.

RELAP5IMOD3.1 was the latest version of the code made available by the Idaho National

Engineering Laboratory at the time of the reported study. PIPER-ONE is an experimental facility

simulating a General Electric BWR-6 with volume and height scaling ratios of 1/2200 and lI,

respectively. In the frame of the present activity a once-through heat exchanger immersed in a

pool of ambient temperature water, installed approximately 10 m above the core, was utilized to

reproduce qualitatively the phenomenologies expected for the Isolation Condenser in the

simplified BWR (SBWR). The PO-IC-2 experiment is the flood up of the PO-SD-8 and has been

designed to solve some of the problems encountered in the analysis of the PO-SD-8 experiment.

A very wide analysis is presented hereafter including the use of different code versions.

mii

CONTENTS

ABSTRACT ......................................................................................................................... iii

LIST OF FIGURES ................................................................................. vii

LIST OF TABLES .................................................................................. ix

ACKNOW LEDGM ENTS ................................................................................................... xi

1. INTRODUCTION .............................................................................................................. 1

2. DESCRIPTION OF THE EXPERIM ENT ...................................................................... 3

2.1 PIPER-ONE Facility ........................................................................................ 3

2.2 TEST PO-IC-2 ................................................................................................. 11

2.2.1 Planning of the test ............................................................................. 11

2.2.2 Test execution ................................................................................... 11

2.2.3 Test results ........................................................................................ 11

3. ADOPTED CODES A D NODALIZATION ............................................................... 27

3.1 The used codcs .............................................................................................. 27

3.2 Strategy of calculations and specific objectives ............................................ 27

3.3 Adopted nodalization ..................................................................................... 27

4. ANALYSIS OF POST-TEST CALCULATION RESULTS .......................................... 39

4.1 Steady state calculations (Phase I of the post-test analysis) ........................... 39

4.2 Reference calculation results (Phase 2 of the post-test analysis) .................... 44

4.2.1 Primary circuit behavior ................................................................... 45

4.2.2 IC behavior ........................................................................................ 46

4.2.3 Heat transfer coefficient across the IC tubes ................................... 48

4.3 Sensitivity Calculations (Phase 3, of the Post-test analysis) .............. 50

4.3.1 Significant results ............................................................................ 51

4.3.2 Results in Apps. 2 and 4 ................................................................... 68

4.3.3. Isolation of downcomer (App.3) ..................................................... 68

4.4 Scaling analysis .............................................................................................. 69

5. CONCLUSIONS ............................................................................................................... 71

REFERENCES ...................................................................................................................... 73

APPENDIX 1: Results of reference calculation (Post-Test IC31) .................................... Al

APPENDIX 2: IC36 results .............................................................................................. A2

APPENDIX 3: IC37 results .............................................................................................. A3

APPENDIX 4: ICA6 results ........................................................................................... A4

APPENDIX 5: Listing of RELAP5/M od3.1 input .......................................................... A5

APPENDIX 6: Overview of the scaling analysis ............................................................ A6

v

LIST OF FIGURES

Figure 1: Sketch of PIPER-ONE facility ........................................................................ 4

Figure 2: Comparison between main regions in PIPER-ONE and in BWR-6 ................. 5

Figure 3: Details of the heating rod of PIPER-ONE ....................................................... 5

Figure 4: Connection between isolation condenser loop and PIPER-ONE loop ............ 6

Figure 5: Sketch of isolation condenser pool with temperature measurement

locations (part A) .............................................................................................. 8

Figure 6: Sketch of isolation condenser pool with temperature measurement

locations (part B) .............................................................................................. 9

Figure 7: Core power and lower plenum pressure ......................................................... 16

Figure 8: Core power and fluid temperature in lower plenum ...................................... 16

Figure 9: Core power and downcomer level ................................................................. 17

Figure 10: Core power and core level ............................................................................. 17

Figure 11: Pressure drop and flowrate across IC ............................................................ 18

Figure 12: Tube "A" axial temperature distribution (external TC) .................................. 18

Figure 13: Tube "A" internal and external TC (upper elevation) ..................................... 19

Figure 14: Tube "A" fluid temperature and external TC (middle elevation) ................... 19

Figure 15: Tubes "A" and "B" fluid temperature (middle elevation) ............................. 20

Figure 16: Tubes "A," "B" and "C" external TC (middle elevation) ............................... 20

Figure 17: IC fluid temperatures (inlet center and outlet) ................................................ 21

Figure 18: Pool internal axial fluid temperatures ............................................................ 21

Figure 19: Pool internal temperatures in different azimutal positions ............................. 22

Figure 20: Pool internal and external (upper elevation) .................................................. 22

Figure 21: Pool internal and external (middle elevation) ................................................ 23

Figure 22: Pool internal and external (lower elevation) .................................................. 23

Figure 23: Pool internal and external different positions ................................................ 24

Figure 24: Temperature at IC inlet comparison with saturation temperature ................... 24

Figure 25: Rod power and thermal power across IC ....................................................... 25

Figure 26: Temperature jump across the wall ................................................................. 25

Figure 27: Fluid temperature disuniformity across tubes ................................................ 26

Figure 28: Surface temperature disuniformities ............................................................... 26

Figure 29: Nodalization of PIPER-ONE loop ................................................................. 37

Figure 30: Measured and calculated trends of lower plenum pressure ............................ 42

Figure 31: Measured and calculated trends of lower plenum temperature ..................... 42

Figure 32: Measured and calculated trends of core level ................................................ 43

Figure 33: Measured and calculated trends of downcomer level .................................... 43

Figure 34: Lower plenum pressure .................................................................................. 52

Figure 35: IC tubes wall surface temperature (external side level 3) ............................... 53

vii
Figure 36:

Figure 37:

Figure 38:

Figure 39:

Figure 40:

Figure 41:

Figure 42:

Figure 43:

Figure 44:

Figure 45:

Figure 46:

Figure 47:

Figure 48:

Figure 49:

Figure 50:

Figure 51:

Figure 52:

Figure 53:

Figure 54:

Figure 55:

Figure 56:

Figure 57:

Figure 58:

Figure 59:

Figure 60:

Figure 61:

Figure 62:

Figure 63:

IC tubes fluid temperature (middle level 3) .................................................. 53

IC outlet fluid temperature .............................................................................. 54

Heat transfer coefficient at the inside of IC tubes wall (level 3) .................... 54

Heat transfer coefficient at the outside of IC tubes wall (level 3) .................. 55

Lower plenum pressure .................................................................................. 55

IC tubes wall surface temperatures (external side level 3) ............................ 57

IC tubes fluid temperature (middle elevation) ................................................ 57

IC outlet fluid temperature .................................................................................. 58

Heat transfer coefficient at the inside of IC tubes wall (level 3) .................... 58

Heat transfer coefficient at the outside of IC tubes wall (level 3) .................. 59

Lower plenum pressure ................................................................................. 59

IC tubes wall surface temperature (external side level 3) ............................... 60

IC tubes fluid temperature (middle elevation) ................................................ 60

IC outlet fluid temperature ............................................................................. 61

Heat transfer coefficient at the inside of IC tubes wall (level 3) .................... 61

Heat transfer coefficient at the outside of IC tubes wall (level 3) .................. 62

Lower plenum pressure .................................................................................. 62

IC tubes wall surface temperature (external side level 3) ............................... 63

IC tubes fluid temperature (middle elevation) ................................................ 63

IC outlet fluid temperature .............................................................................. 64

Heat transfer coefficient at the inside of IC tubes wall (level 3) .................... 64

Heat transfer coefficient at the outside of IC tubes wall (level 3) .................. 65

Lower plenum pressure ...................................................................................... 65

IC tubes wall surface temperature (external side level 3) ............................... 66

IC tubes fluid temperature (middle elevation) ................................................ 66

IC outlet fluid temperature .................................. 67

Heat transfer coefficient at the inside of IC tubes wall (level 3) .................... 67

Heat transfer coefficient at the outside of IC tubes wall (level 3) ................. 68

viii
LIST OF TABLES

Table I: Comparison between isolation condenser related data in PIPER-ONE

and in SBW R ................................................................................................ 10

Table II: PIPER-ONE test PO-IC-2: initial conditions ................................................ 12

Table EIl: PIPER-ONE test PO-IC-2: boundary conditions ........................................... 12

Table IV: PIPER-ONE test PO-IC-2: power history ..................................................... 12

Table V: Details of nodes geometry in the RELAP5 nodalization .............................. 29

Table VI: Details of relevant junction related parameters of RELAP5 nodalization ......... 36

Table VII: Comparison between measured and calculated initial conditions ................. 41

Table VIII: Comparison between measured and calculated boundary conditions ............ 41

Table IXa: Evaluation of the heat transfer c" efficient (Ph.w.2) ...................................... 49

Table IXb: Evaluation of the heat transfer c4 efficient (Ph.w.4) ........................................ 49

Table X: List of calculations and varied parameters ..................................................... 50

Table XI: Documented calculations ............................................................................... 51

ix

ACKNOWLEDGMENTS

The authors acknowledge the contribution of the technical staff of the Scalbatraio

Laboratory for performing the experiments and in particular F. Mariotti, F. Pistelli, R.

Centonze and F. Rosellini.

The University of Munchen student C. Rierter also contributed to the preparation of

the facility for the experiment.

The authors gratefully acknowledge also D. Del Corso, for typing and editing this

document.

Thanks are finally due to Dr. P. Marsili of ANPA for collaborating in defining the

objectives of the activity and for revising the manuscript.

xi

1. INTRODUCTION

Innovative reactors, (essentially AP-600 and SBWR) arc characterized by

simplification in the design and by the presence of passive systems. Experimental and

theoretical research arc needed to qualify the new components introduced in the design and

to charactcrizc the new thcrmalhydraulic scenarios cxpccted during accidents. Available

systcm codes have to bc validated in order to be used for evaluating the thcrmalhydraulic

performances of the new systems, especially in case of long lasting transients evolving at

low pressure /I/.

In the framc of the activities carried out at University of Pisa related to the analysis of

thermalhydraulic situations of interest to the mentioned reactors (e.g. refs. /2/, and /3/),

threc series of experiments have been carried out utilizing the PIPER-ONE facility. They

were aimed at the experimental investigation of the behaviour of systems simulating the

main features of the Gravity Driven Cooling System (GDCS, first series of experiments,

rcfs. /4/) and of the reactor pressure vessel Isolation Condenser (IC, second and third series

of experiments, rcfs. /5/ to /7/ and ref. /8/, respectively). At the same time Rclap5/mod2 /9/,

and mod/3 /10/ codes have been extensively applied as best estimate tools to predict the

transient scenarios of both SBWR and AP-600 reactors: (see also refs./ Il/and /12/).

PIPER-ONE is a General Electric BWR experimental simulator specifically designed

in the early '80 to reproduce small break LOCAs transient scenarios (e.g. rcfs. / 3/ - 15/).

The volume scaling ratio is 1/2200, the height scaling ratio is 1/1 and the available core

power is roughly 25% of the scaled full nominal power. The mentioned experiments were

essentially devoted to a qualitative investigation of the thermalhydraulic conditions typical

of the new components foreseen in the above reactors (essentially SBWR) and at setting up

a data base suitable for code assessment. The distortions that characterize PIPER-ONE

hardware in comparison with a scaled loop simulating SBWR. completely prevent a

possible application of the measured data to reactor conditions: the core and downcomer

heights, as well the distance between the Bottom of Active Fuel (BAF) and the Isolation

Condenser top are important parameters not considered in the model.

The aforementioned applications to innovative reactors scenarios emphasized the

codes inadequacies in producing reliable results when system pressure attains values below

0.5 MPa. Numerical deficiencies, limited ranges of validity of the utilized correlations and

lack of user experience (i.e. difficulty to develop a suitable code use strategy) are retained

mostly responsible of this situation.

The purposes of the activity described in the present document, that is the direct

follow up of the post-test evaluation of the previous IC experiment PO-SD-8, ref. /7/, are

essentially three:

a) to give an outline of test results obtained during the high pressure part of the test PO-IC2 also related to the study of the Isolation Condenser performance;

b) to evaluate the capabilities of the latest version of RelapS/mod3 code (i.e. version 3.1) in

reproducing the experimental scenario giving emphasis to the attempt of fixing the code

limitations and the criteria for the optimal use of the code.

c) to demonstrate possible improvement in the latest code version with respect to the

previous one especially in relation to condensation.

In order to achieve these objectives the original Rclap5/mod2 nodalization of the

PIPER-ONE apparatus /16/, also modified to perform pre-tcst and post-test calculations of

the test PO-SD-8 (e.g. refs. /7/ and /17/), was completely revised. In particular, the number

of nodes was roughly doubled also considering the available computer code capabilities.

This nodalization was qualified by the calculation of the test PO-SD-8 and was used

extensively for stability analysis in PIPER-ONE loop, ref. /I M

I
Many sensitivity calculations were performed in the present context to identify some

unknown boundary conditions (e.g. spatial distribution of heat losses to the environment)

and to optimize the user choices like the countercurrent flow limiting option in the annular

region of steam separator to predict liquid deentrainmcnt from the mixture flowing out

from the core.

2
2. DESCRIPTION OF THE EXPERIMENT

2.1 PIPER-ONE Facility

The PIPER-ONE apparatus is an integral test facility designed for reproducing the

behaviour of BWRs in thermalhydraulic transient, dominated by gravity forces.

The ENEL BWR plant installed at Caorso (I) was formerly taken as the reference

prototype in the design of the apparatus. The reactor is a General Electric BWR-4 plant,

equipped with a Mark II containment, but it has some features of the latest GE design (e.g.,

8xg fuel rod assembly). The situation of nuclear energy in Italy, at the beginning of the

experimental phase, led to a revision of the original experimental programme. The BWR-6

plant, equipped with 624 fuel bundles was assumed at reference for the first test carried-out

on the PIPER-ONE facility, chosen by OECD-CSNI as ISP 21 /191; then, the latter was

used as a reference plant for all the LOCA tests, which had already been performed.

The simplified sketch of the apparatus is shown in Fig. 1; it includes the main loop,

the ECCS simulators (LPCI/CS, HPCI/CS) and the systems simulating ADS, SRV and

steam line, as well as the blow-down line.

Nine zones can be identified in the main loop: lower plenum, core, core bypass

(outside the core), guide tube region, upper plenum, region of separators and dryers, steam

dome, upper downcomer, lower downcomer and jet pump region. The correspondence

between the circuit and the vessel of the actual plant is shown in Fig. 2.

The volume scaling factor is about 1/2200, while the core cell geometry and the

piezometric heads acting on the lower core support plate are the same in the model and in

the reference plant.

The heated bundle consists of 16 (4x4) indirectly heated electrical rods, whose height,

pitch and diameter are the same as in the reference plant (Fig. 3). The maximum available

power is 320 kW, corresponding to about 25% of scaled full of the reference BWR.

The one-dimensionality as well as the overall simplicity of the apparatus are

highlighted in Fig. 1; this is the direct outcome of the main objective of the research. In fact,

the primary circuit was designed in such a way to have as far as possible:

- one dimensional cylindrical volumes (nodes in codes calculations);

- connections between adjacent nodes clearly defined (geometric discontinuities, Venturi

nozzles, orifices);

- lack of items (such as pumps and control systems) which can originate confusing

situations in code calculations.

The instrumentation system has features consistent with the fundamental philosophy

of the facility design:

- direct measurements of integral or mean quantities (overall heat and mass entering or

exiting from the primary circuit, collapsed levels in the various zones, mean temperatures

in the volumes and interfacing structures, mean density in a section, etc.);

- measurement of the various quantities (such as fluid and structure temperatures) in the

middle of the volumes and at the junctions connecting the various zones.

Roughly 250 transducers are part of the instrumentation system: rod surface

temperatures, absolute pressures, differential pressures, flowrates, density and temperatures

of the fluid and of the structures are measured in different zones of the loop.

3
SRV

Fig. I - Sketch of PIPER-ONE facility

4
Fig. 2 -Comparison between main regions in PIPER-ONE and in BWR-6

U.

I ewer --- I----, -

I I -q-

, : ; ' l i I

I I I I I I

I a a I S I a , a I I S

1Scneon. too

S. los*J.J

I 130 I10 96 11390 A 2120 I 2650 5 3180 210 IlfI

Lml & 3 C . 0 z r

Fig. 3 - Details of the heating rod of PIPER-ONE

5
The data acquisition system can record 128 signals, with a frequency of up to 10 Hz

for each signal. Particular care was taken to evaluate and maintain an adequate accuracy in

measurements. The methodology developed (and adopted) includes:

- periodic calibration of all the transducers, in such a way to avoid or at least to reduce the

systematic errors;

- control of the instrumentation system and of the related data acquisition system, before,

during the preparation and at the end of each test. These checks reduce random errors and

verify the correct operation of the measurement and data acquisition systems.

As already mentioned, the facility hardware was modified by inserting the loop, which

can operate at the same pressure of the main circuit (Fig. 4).

The main component of Isolation Condenser loop is a heat exchanger consisting of a

couple of flanges that support 12 pipes, 22 mm outer diameter and 0.4 m long; it is

immersed in a tank of I mivolume, containing stagnant water, located at 4th floor of the

PIPER-ONE service structure. The heat exchanger is connected at the top and at the

bottom respectively with the steam dome and the lower plenum of the main loop. In order

to enhance natural convection inside the pool, a sort of shroud has been installed that

divides the pool into two parts; a hot one and a cold one, the former encompassing the IC

as can be seen in Fig. 5.

The Isolation Condenser loop is instrumented with a turbine flow-meter (Fig. 4) and a

differential pressure transducer on the hot side (PD-IC-2 in Fig. 5) and a series of almost 30

thermocouples in various position of the IC and of the pool as can be derived from Figs. 5

and 6.

Fig. 4 - Connection between isolation condenser loop and PIPER-ONE loop

6
In particular, 5 thermocouples measure the primary side fluid temperature at the inlet

(TF-IC-0), and outlet of the tubes bundle (TF-IC-4) and inside three different tubes

(TF-IC-l to 3); 7 thermocouples are installed on the outer surface of the tubes (TS-IC-1 to

TS-IC-9, excluding the position 2 and 4); 2 thermocouples are installed on the inner surface

of the tubes (TS-IC-2 and TS-IC-4); 14 thermocouples (TF-SC-l to TF-SC-14) give a

measure of the fluid temperature distribution in the pool. The distribution of thermocouple

should give an idea of possible multidimensional phenomena in the pool and inside the IC.

In addition, the instrumentation already available for measuring pressure, level and

temperature in the different zones of PIPER-ONE apparatus is used.

Hardware restrictions preclude the possibility to have a system correctly scaled with

respect to those provided for the new generation nuclear reactors, particularly the GE

SBWR. This is evident from Table I, where relevant hardware data characterizing the

Isolation Condenser loop installed in PIPER-ONE facility are compared with SBWR related

data. In particular, Table I demonstrates that the heat transfer area of Isolation Condenser in

PIPER-ONE is roughly five times larger than the ideal value. The distance between bottom

of the active fuel and the Isolation Condenser and the height of the core itself are two of the

most important parameters differentiating PIPER-ONE from SBWR. These essentially

prevent any possibility of extrapolating PIPER-ONE experimental data to SBWR.

7
heat exchanger

tubes

water outlet I

Fig. 5 - Sketch of isolation condenser pool with temperature measurement locations (part A)

8
V2l~lilIi7W/l~ !l~WAll/

•/////////J/.• •////•

cut A-A TS-IC 2-

TS-C 4 -

TF-IC 1 -

V ¥////////////.•

TS-IC I

TS-IC 3

TSIC 5

TS1C 6

TS-1C 7

tubeA

C

0 0

o A

o 0

B

cut B-B

TF-IC 2 or -

TF-IC 3

TS-1C 8

*or

TS-1C 9

,11

tubes BC

Fig. 6 - Sketch of isolation condenser pool with temperature measurement locations (part B)

9
QUANTITY UNIT PIPER-ONE SBWR O RATIO (+) IDEAL (+) VALUE

PIPER-ONE/SBWR OF THE RATIO

PIPER-ONE/SBWR

I Primary

volume

system 0.199 595. 1/2990 1/2990

2

3

4

5

6

7

8

9

10

11

12

Core height m 3.710 2.743 1.35/1 1/1

Maximum MW 0.320 2000. 1/6200 1/2990

nominal core

power

Value of 3% core MW 0.0410(T 60. 1/1463 1/2990

power

Ratio (3% core MW/mr3 0.206 0.1 2.06/1 1/1

power) /primary

system volume

Isolation 0.301 184 1/610 1/2990

condenser heat

transfer area (++)

Isolation 1.512 0.31 4.9/1 1/1

condenser heat

transfer area over

primary system

volume

Isolation oodkns m3 0.0015 2.334 1/1556 1/2990

Isolation - 0.0075 0.0038 1.97/1 1/1

condenser volume

over primary

system volume

Isolation. m2 /kW 7.341 3.066 2.39/1 1/1

condenser heat

'transfer area over

3% core power

Height of m 8.64 24.75 1/2.86 1/1

isolation

condenser top

related to bottom

of active fuel

Diameterof a m 0.020 0.0508 1/2.54 1/1

single tube I

13 1 Thldasscfasingfe m 0.0023 0.0023 1/1 1/1

Ube A. J

(+) non-dimensional

(++) only tube bundles

(0) IC data have been taken from reference /21/

(-) related to BWR6

Tab. I - Comparison between isolation condenser related data in PIPER-ONE and in SBWR.

10
2.2 TEST PO-IC-2

2.2.1 Planning of the test

As already mentioned, test PO-IC-2 was the follow-up of .the PIPER-ONE

experiment PO-SD-8. Essentially, some discrepancies were found in the comparison

measured-calculated trends in relation to variables representative of the IC behaviour; the

lack of adequate local instrumentation in the IC prevented a complete characterization of

the code-calculation adequacy. Furthermore, strong thermal stratification, as expected, took

place in the cooling pool. The last two items led to the planning of the PO-IC-2 test as

reported in ref. /8/.

Owing to the above, the instrumentation system was largely improved, now including

the transducers discussed in the previous section A "shroud" was inserted into the pool to

facilitate natural convection motion.

The original design of the PO-IC-2 experiment foresaw the same boundary and initial

conditions as PO-SD-8 test; similar features were also foreseen for general test conduction

(e.g. different core power levels, timings, etc.). Considering the presence of new devices

installed in the PIPER-ONE facility (essentially active feedwater and steam line systems, ref.

/18/), the initial part of the test should be addressed to characterizing PO behaviour in

natural circulation. Unfortunately, the electrical power supply system suffered of heavy

problems during the first attempt to carry out the experiment. Owing to this the maximum

power was limited to less than 100 kW (i.e. 1/4 of the nominal value for the facility,

roughly).

So, only two power steps were included in the final test design, at about 40 and 80

kW respectively, while primary circuit pressure was as specified, i.e. around 5. MPa (the

same as in the experiment PO-SD-8). Relevant boundary and initial conditions are discussed

in the following section.

2.2.2 Test execution

The execution of the PO-IC-2 test was essentially the same as test PO-SD-8; the

"dynamic steady state", utilizing the active feedwater and steam line systems, was not

performed and the usual "static steady steady" was achieved.

The primary circuit was pressurized at the specified value by single phase and twophase natural circulation with heat sources consisting of the core simulator and the

structures heating system; before the test beginning, the liquid was drained to obtain the

required levels in the downcomer and core regions.

The "static steady state" was achieved at zero core power and with structures

electrical heating power switched on to compensate the heat losses (around 20 kW). The

isolation condenser line was closed and almost full of ambient temperature liquid (60 mm

above the top of IC heat exchanger).

At the beginning of the test, core heating power was switched on and almost

simultaneously (see below) the IC line was open. Two core power levels, as already

mentioned, were considered.

2.2.3 Test results

The initial and boundary conditions for the PIPER-ONE experiment PO- IC-2 are

given in Tabs. II to IV. The two parts of the test ("low" and "medium" power, respectively)

were carried out subsequently and in this way are also considered in the code calculation;

so, initial conditions are only related to the "low" power phase.

I1
32 measurement points were recorded during the test; most of these, are related to the

IC loop and the remaining ones to the primary circuit. The measurement error band is that

typical of all PO tests, because the established procedure of instrumentation check has been

followed for carrying at the test. As an example the temperature signals have an error band

(2 a) of + 2K /19/.

PARAMETER SIGN UNIT VALUE

LP pressure PA-LP-1 MPa 5.1

LP fluid temperature TF-LP-! 0C 262.5

Core level LP-CC-1 m 11.9

Downcomer level LP-LD-I m 10.7

IC line fluid temperature TF-IC-I °C 17.5

IC pool fluid temperature TF-SC-1 0C 17.5

Tab. II - PIPER-ONE test PO-IC-2: initial conditions

PARAMETER OR EVENT TIME

(s)

Test initiation 0.0

Power versus time as in Tab. IV

IC top valve opens 4.0

IC bottom valve opens 32.0

IC top valve closes 508.0

IC top valve opens again 602.0

IC top and bottom valve close 1106.0

End of test 1184.0

Tab. III - PIPER-ONE test PO-IC-2: boundary conditions

TIME (0) POWER

(s) (kW)

0.0 0.0

5.0 41.60

438.0 41.60

440.7 0.0

586.1 0.0

588.0 70.47

590.0 73.30

1086.0 73.30

1088.0 0.0

1184.0 0.0

(-) from test start

Tab. IV - PIPER-ONE test PO-IC-2: power history

12
Primary circuit behaviour

Primary circuit pressure, lower plenum temperature, downcomer and core region

levels arc shown in Figs. 7 to 10, together with core power.

The IC was expected to remove almost 80 kW, ref. /7/; so the primary system

pressure decrease until about 500 s (Fig. 7) is a foreseeable result considering that at the

transient initiation (Tab. Ill) the IC line was opened and about 40 kW were supplied to the

core simulator. In the second part of the transient, starting at about 600 s, the core power

was very close to the IC removed power and primary circuit pressure was quite constant. a

slight decrease of the pressure testifies that IC removed power is (slightly) larger than the

power supplied to core simulator (73. kW).

The thermocouple producing the signal in Fig. 8, is installed in the zone of the lower

plenum where the IC line is connected with the primary circuit: this explains the

oscillations observable during the IC operation periods. In particular, oscillations

amplitudes as large as 80 K have been measured as a consequence of cold liquid (coming

from IC) mixing with hot liquid in the primary circuit.

Average cooling of the primary loop in the first phase of the experiment can also be

deduced from observing core and downcomcr regions levels in Figs. 9 and 10. In the

second part of the experiment these levels remain quite constant. Unquantificd dynamic

effects arc included in the level signal during the periods of IC operation; these arc due to

the natural circulation flowratc (0.5 - 0.7 kg/s) between core and downcomcr.

IC system behaviour

The Isolation Condenser system behaviour has been characterized by the time trends

reported in figures from I I to 28.

The mass flowratc and the pressure drops across the IC are shown in Fig. 11. The

mass flowratc signal, output of the turbine transducer, is not correct up to about 200 s. The

pressure drop signal gives an idea of the filling and emptying of the IC tubes: starting from

a situation with liquid level at the top of the component, a drop of the level up to about 2/3

of the tubes height can be observed in both the phases of the experiment. During the period

of isolation of the line the internal side refills owing to abrupt steam condensation (this

causes a shock wave that, among the other things, is the origin of problems in code

calculations).

The axial tubes external surface temperatures (Fig. 12), show a large difference along

the pipe high (around 50 K).

Other temperature differences can be observed in Figs. 13-17. A temperature jump of

about 60 K roughly (the tubes thickness is 3 mm) is measured across the thickness in the

upper part of the tubes (Fig. 13, see also Fig. 26); a larger temperature jump exists between

the fluid and the external surface temperature (Fig. 14). Two-dimensional effects are

indicated by Fig. 15, that shows the fluid temperature at the center of the two tubes:

differences of the order of 20 K occur at the same elevation in two different tubes;

moreover, the phenomenon repeats with the same characteristics in the two phases of the

experiment. Radial disuniformities seem less important in the external surface (Fig. 16, see

also Fig. 28): nevertheless, some additional analysis is needed to characterize the

occurrence of multidimensional effects. Finally, fluid temperature variations between the

inlet and the outlet of the IC can be drawn from Fig. 17; this shows that all the steam is

condensed in the first half of IC, and the liquid outflowing from IC is highly subcooled

(about 120 C).

Fluid temperatures inside the pool are shown in figures from 18 to 23. Essentially

three aspects should be noted:

a) strong temperature stratification exists: the fluid temperature differences between top

and bottom is of the order of 70 K (Fig. 18);

13
b) fluid temperatures arc almost the same in the internal and the external sides of the

shroud (Figs. from 20 to 23): this means that the shroud is not effective in enhancing

natural circulation between the heated and the unheated part of the pool also duc to the

good heat conduction across the wall;

c) maximum fluid temperature in the pool is always below the saturation temperature, i.e.

no bulk boiling condition was achieved during the test.

Elaborations of the discussed signals arc given in Figs. 24 to 28.

It can be noted that saturated steam (or two-phase mixture) is present at the IC inlet

(Fig. 24).

The IC removed power is larger than the core supplied power in the first phase of the

experiment and roughly the same in the second period. this is confirmed by the primary

pressure that decreases in the first period and remains almost constant in the second one.

The IC removed power is obtained from

GIC * (HGI - HFO)

where GIC is the IC flowratc, HGI is the steam saturation cnthalpy at IC inlet (so it is

assumed that only steam arrives from the primary circuit) and HFO is the liquid cnthalpy at

the IC outlct. Obviously the inadequacy of GIC in the first 200 s (see above) also reflects in

the calculated IC power.

Temperature jumps arc reported in Figs. 26 to 28.

Significant outcomes

Two main aspects can be emphasized from the analysis of the experimental data.

The former is connected with the constant value of the IC removed power, whatever

is the electrical power supplied to the core simulator. This situation was already found in

the previous experiment (test PO-SD-8, rcf. /7/) albeit with a different primary circuit

geometrical configuration and with different values (larger values) for core power. The

phenomenon is a consequence of the about constant value of the IC flowratc. This occurs

because the IC loop can be considered as one of the two parallel natural circulation flow

paths for the two-phase mixture in the core region, the other one being the main loop with

the downcomer. Actually, the overall flowrate across the core is the sum of flowrates

crossing downcomer and IC. The driving heads are the pressure differentials between

downcomer and core regions and between IC and core regions, respectively. Owing to

geometry, the pressure drops across IC are higher than across the downcomcr (ideally, with

the same flowrate). As a consequence of this, increases of core power reflect as increases of

mass flow across the downcomcr.

The same conclusion can be reached considering that the pressure drop between the

points connecting the IC to the primary loop are held nearly constant by the gravity head

constituted by the liquid level in the downcomcr that, at its time does not substantially

change in the two periods of the experiment. As a final note, the overall gravity head in the

IC line cannot change too much owing to the elevation of the IC component itself (the only

zone where fluid density variations may occur assuming in any case complete

condensation) that is less than 1110 of the total axial length. Second orider contributions to

differences between the high and the low power periods as far as the overall IC removed

power is concerned, come from:

- the progressive heating of the pool that in the high power period, may be compensated

by the increase in the heat transfer coefficient on the outer part of the IC tubes- - pressure variations in the primary circuit.

14
The latter aspect concerns the local behaviour of the heat transfer coefficient in the IC

region. First of all it should be noted that the liquid level in the IC is almost the same

during the two periods of the experiment (Fig. 11). Secondly, as already mentioned,

temperature increases in the pool (of almost 70 K in the upper part, Fig. 18) have no or

limited consequence upon the external surface tubes temperature (Fig. 12). Also the

temperature jump between primary fluid and tubes external surface, remains almost

constant as it results from Fig. 14. As a conclusion, notwithstanding variations of fluid

conditions in the pool, the heat transfer phenomenon remains almost unchanged, when core

power is varied.

An experimental verification of the link between IC and DC flowrates has been

achieved recently, during the execution of another tests PO-IC-3, similar to PO-IC-2 but at

low pressure (- 0.5 MPa).

In the test PO-IC-3, after a period of quasi-steady conditions, a valve was open

simulating a small break in lower DC. This lead to the stop in natural circulation between

core and DC, due to the DC level lowering.

In this time period the IC flowrate increased.

It should be noted that both the above conclusions have been confirmed by code

calculation results (see below) and seem directly applicable to nuclear power plant

conditions: infact the described phenomena are not affected by the scale distortions of the

PIPER-ONE apparatus.

Experimental errors

An extensive analysis for determining errors characterizing the experimental data

was carried out in the occasion of the use of PIPER-ONE for the OECD/CSNI ISP 21, refs.

/25/ to /27/. Details about methods for deriving measurement errors, can be found in ref.

/28/.

The error concerned (i.e., error bands corresponding to two standard deviations) for

the most relevant quantities, are as follows, ref. /28/:

- absolute pressure: ± 0.05 MPa;

- fluid temperature in primary loop: ± 2 K:

- core level: ± 0.1 m:

- downcomer level: + 0.1 m;

- fluid temperature in the tank: ± 0.5 K;

- IC flowrate: ± 0.01 kg/s;

- core power: ± I KW (valid for the present test only);

- timing error (mainly for valves opening/closure): ± 2 s.

15
Y

100.

80.

60.

40.

IPE-N P I Tes IC

9 a 9 i

YYY EI2AWH-POWER

XXX EI2APA-LP-1

0

3

0

0.

x

5.750

5.500

5.250

5.000

4.750 .

45 4.500

4.250 •_

4.000

3.750

3.500

3.250

1200

20.

0.

-20.

-200

I I * S I S I S S I I S S

0 200 400 600 Boo 1000

Time (s)

Fig. 7 - Core power and lower plenum pressure

y

100.

so.

60.

40. 3=

0

I.

x

580.

560.

540.

520.

500.

480.

460.

440.

420.

400.

380.

1200

E

1!

20.

0.

-20. L.-

oo 0 200 400 600

Time (s)

Fig. 8 - Core power and fluid temperature in lower plenum

800 1000

16
Y

F

100. .. . ,

PIPER-ONE Test PO-IC-2A

80.

60.

40.

20.

0. _

-20. a

-200 0 200 400

Time (s)

Fig. 9 - Core power and downcomer level

x 12.000

11.500

11.000

10.500

10.000'i

fl. 9.500

9.000

8.500

- 8.000

600 800 1000 1200

y

100.

80.

60.

C

0

0.

40.

PIPER-ONE Test PO-IC-2A

I

YYY EI2AWH-POWER

XXX E12AL.P-CC-1

x

13.000

12.500

12.000

11.500?

11.000-J

10.500

10.000

9.500

1200

20.

0.

-20.

-200 0 200 400 600

Time (s)

800 1000

Fig. 10 - Core power and core level

17
T X

14.000 - , . .' . , , , , 0.400

* PIPER-ONE Test PO-IC-2A YYY EI2APO-IC-2D

XXX E12AWW.IC- 3

13.000

0.300

4 12.000

0.250 *

11.000 0

0.200 .

10.000 :.150 •= , o.100

S9.000 SI

0.050

8.000

X ......... 0.000

7.000 , " I0.050

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 11 - Pressure drop and flowrate adross IC

400. 1 1 a I 1 9 1 1

PIPER-ONE Test PO-tC-2A Xxx EIATS-IC-1

YYY EIATS-IC-3

ZZZ EIATS-IC-5

380. ##8 EIATS.IC-7

2 360.

C. 340.

E

•: 320.

300. "

280.

-200 0 200 400 600 B00 1000 1200

Time (s)

Fig. 12 - Tube "A" axial temperature distribution (external TC)

18
460. * * . * g , I

PIPER-ONE Test PO.IC-2A XXX EIATS-AC-2

440. YYY EATS-,C-1

420.

S400.

380.

360.

S 340.

320.

300.

280. I P P I ,

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 13 - Tube "A" Internal and external TC (upper elevation)

550. 1 . .. 1 1 

PIPER-ONE Test PO-IC-2A XXX E1ATF-IC-1

YYY EIATS-IC-5

500.

450.

400.

350.

300.

250. , , , S I , 5 I I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 14 - Tube "A" fluid temperature and external TC

(middle elevation)

19
5 5 0 . 1 1

PIPER-ONE Test PO-IC-2A XXX ElATF-IC-1

YYY EIATF-IC-2

500.

450.

00 S 400.

300.

250. 5 I 4 I 5 S 5 5

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 15 - Tubes "A" and "B" fluid temperature (middle elevation)

400. 1 9 1 1 1 1 1 1

PIPER-ONE Test PO-IC-2A XXX E1ATS-IC-5

YYY E1ATS-IC-8

380. ZZZ EIATS-IC-9 380.

2~360.

C 340.

E

I-

• 320.

300.

280. '

-200 0 200 400 600 Boo 1000 1200

Time (s)

Fig. 16 - Tubes "A" "B" and "C" external TC (middle elevation)

20
650.

PIPER-ONE Test PO-IC-2A

YYY EIATF-IC-1

600. ZZZ ElATF-IC-4

550.

500.

450.

400.

350.

300.

250.

-200 0 200 400 600

Time (s)

Fig. 17 - IC fluid temperatures (inlet, center and outlet)

800 1000 1200

E

0

I..

380.0 -

370.0

360.0

350.0

340.0

330.0

320.0

310.0

300.0

290.0

280.0 -

-200

Fig

0 200 400

Time (s)

r. 18 -Pool Internal axial fluid temperatures

600 800 1000 1200

21
6

6

0

a.

S0

I-

:2

300.0

298.0

296.0

294.0

292.0

290.0

288.0

286.0

284.0-2 zoo 0 200 400 600 800

Time (s)

Fig. 19 - Pool internal temperatures In different azimutal positions

1000 1200

0

3.

uC

380.0

370.0

360.0

350.0

340.0

330.0

320.0

310.0

300.0

290.0

280.0

-200

PIPER-ONE Test PO-IC-2A MX EIATF-SG-1

YYY EIATF-SC-10

I -

I a a a a . - . . - - . 2

0 200 400 600

Time (s)

800 1000 1200

Fig. 20 - Pool temperatures, Internal and external to shroud (upper elevation)

22
2

S

S..

E

300.0

298.0

296.0

294.0

292.0

290.0

288.0

286.0

284.0

-200

PIPER-ONE Test PO-IC-2A XXX EIATF-SG-4

YYY EIATF-SC-12

I

0 200 400 600 goo 1000 1200

Time (s)

Fig. 21 - Pool temperatures, Internal and external to shroud (middle elevation)

U.

300.0

298.0

296.0

294.0

292.0

290.0

288.0

286.0

284.0

-20

PIPER-ONE Test PO-IC-2A XXX EIATF-SC-6

YYY EIATF-SC-14

*I

S * S I l f I f l I I I

)0 0 200 400 600 800 1000 1200

Time (s)

Fig. 22 - Pool temperatures, Internal and external to shroud Power elevation)

23
0

0

a

2

U.

300.0 1 a I I I I

PIPER-ONE Test PO-IC-2A

298.0

296.0

294.0

292.0

290.0

288.0

286.0

284.0

-200 0 200 400 6C

Time (s)

Fig. 23 - Pool temperatures (differential positions)

K0 800 1000 1200

U.

650.

600.

550.

500.

450.

400.

PIPER-ONE Test PO-IC-2A XXX E1ATF-IC-0

YYY EIATSAT

X_ I

350.

300.

250 200 0 200 400 600 E

Time (s)

Fig. 24- Temperature at IC Inlet comparison with saturation

temperature

800 1000 1200

24
&

g00 I I - a I I a

PIPER-ONE Test PO-IC-2A

GOo

700

600

500

400

300

200

100

0 -- X

-100 * I I I I

-200 0 200 400 60

Time (s)

Fig. 25 - Rod power and thermal power across IC

0 800 1000 1200

80.0

70.0

60.0

50.0

40.0

PIPER-ONE Test 130-1ý2A R TM EIATSIC2-TSICI

S

S..

0

IU

C

S

S.. S

0

30.0 1-

20.0 I10.0 -

0.0 1-

-10.0

.20

I

200 0 0 200 400 600 800 1000 1I

Time (s)

Fig. 26- Temperature jump across the wall

25
2

0

N

I

S.-

.1

0

0

a

70.0

60.0

50.0

40.0

30.0

20.0

10.0

0.0 -

-10.0

_.3fl At

P I I I I

IPIPER-ONE Test PO-IC-2A XXX EIATFICI-TFIC2

9 | | II |

-2200 0 200 400 600

Time (s)

Fig. 27 - Fluid temperature disuniformity across tubes

I

800 1000 1200

2

0

I..

N4-

0

C.

2

0

Ia

0

I..

0

=

a

20.0 . . . .

PIPER-ONE Test PO-IC-2A

15.0

10.0

5.0

0.0 -

-10.0 I

-15.0

-20.0

-25.0

-200 0 200 400

Time (s)

Fig. 28 - Surface temperature disuniformitles

XXX EIATSICS-TSIC8

YYY EIATSICS-TSIC9

ZZZ EIATSICS-TSIC9

W..

J I I I i I I

600 800 1000 1200

26
3. ADOPTED CODES AND NODALIZATION

3.1 The used codes

The standard version of the RelapS/mod3.1 has been adopted as reference code in the

present study; none of the possible user selectable options has been activated when

performing the reference calculation; necessary adjustments of initial and boundary

conditions (see below), within the experimental uncertainty bands, have been done with this

code version ("reference" code version) aiming at getting the "base calculation". The

adopted standard version of Relap5/mod3.1 runs on an IBM RISC 6000.

Once the "base calculation" results have been obtained, previous code versions

RelapS/mod2.5, Relap5/mod3 7J and RelapS/mod3 v80, running on Cray mainframe, IBM

PC 486 and IBM RISC 6000 respectively, have been utilized, too.

3.2 Strategy of calculations and specific objectives

The overall strategy of the performed analysis aimed at assessing the capabilities of the

reference code version and at identifying possible improvements with respect to previous code

versions; sensitivity calculations considering variations in the nodalization have been

performed in this framework.

An additional objective of the analysis was to confirm the explanation given for the

reasons of constant IC flow when core power is varied.

3.3 Adopted nodalization

Considering the above objectives, the acquired experience in the use of the latest

Relap5 code versions, the code user guidelines, ref. /19/, and the criteria proposed in ref.

/20/ for nodalization development and qualification, a new PIPER-ONE input deck has been

developed.

The sketch of the new nodalization is shown in Fig. 29. Actually this has been

developed in the frame of the BIP (Boiling Instability Program) proposal, e.g. ref. /18/, and

already used in that frame for the planning of experiments.

The main difference with respect to the original nodalization (e.g. ref. /16/) lies in the

number of nodes that in this case is roughly three times larger. Moreover, the hardware

modifications in the primary circuit of the facility have also been considered. In particular,

the feedwater line has been added and the connection zone between downcomer and lower

plenum and the region around the top of the separator have been slightly modified to better

reproduce natural circulation in the reference reactor.

The IC system nodalization is essentially the same as adopted for the post-test analysis

of the PO-SD-8 experiment (refs. /5/ and /6/); only the pool nodalization has been changed

to account for the presence of a shroud enveloping the IC component.

Relevant input values related to the hydraulic volumes and to the connecting junctions

of the nodalization, are summarized in Tabs. V and VI. The following items can be added to

clarify Fig. 29 and the last tables:

- the nodes 100 to 140 (in total 14 nodes) represent the lower plenum which is connected

with the jet-pump/downcomer region through the junction 325-03, with the core bypass

through the junction 130-02 and with the IC system through the junction/valve 550; -the

hydraulic volumes 325, 330, 335 and 345 (11 nodes) are also part of the lower plenum

and constitute the connection region downcomer - lower plenum;

- the nodes 200, from I to 16 represent the core: among these, the nodes 200-01 to 200-14

27
constitute the active region;

- the nodes 145 to 180 (in total 40 nodes) represent the core bypass that is connected to

lower plenum and to the core exit region (through the junction 205-02);

- the upper plenum region is simulated by nodes from 205-01, to 220-02 (4 nodes) and

include connections to core, core bypass and to the volume surrounding the fuel box

simulator (see below);

- the volume surrounding the fuel box simulator has been included to preserve the square

cross section for the fuel box, at the same time avoiding unrealistic thickness to maintain

the pressure; it is connected with the main loop through the junction 360-01;

- the separator region consists of nodes from 220-03 to 220-20 (18 nodes) and is

constituted by a "PIPE" component;

- the steam dome is constituted by vertical and horizontal parts, i.e. nodes from 235 to 265

(21 nodes) and includes connections with the separator through the junction 235-01, with

the 'separator annulus' (see below) through the junction 235-02, with the downcomer

through the junction 270-01, with the IC system through the junction 245-03 and with

"external systems" like the steam line, the pressure control, the SRV and the ADS through

the TMDPJUN 433 and valves from 443 to 473;

- the 'separator annulus' is a region outside the separator region and has been introduced to

avoid the return of possible wall condensed liquid directly to the core region, volumes 225

and 230 (9 nodes); it is connected with the downcomer through ani horizontal line

including nodes 290 and 295;

- the downcomer is constituted by a cylindrical part consisting of hydraulic volumes from

270 to 310 (22 nodes) and by an annular part, hydraulic volume 320 (15 nodes)

surrounding the jet pump simulator; the downcomer is connected with the steam

dome/separator region through the junction 270-01, with the feedwater system through

the TMDPJUN 453, with the separator annulus through the junction 300-03 and with the

jet-pump through the junction 310-03;

- the jet-pump simulator is constituted by the cylindrical hydraulic component 315 (15

nodes) directly connected with the downcomer and the lower plenum region;

- structures heating systems and cooling systems are part of the nodalization and reflect the

characteristics of the components in the facility (ref. /13/);

- emergency systems have also been included according to the design of PIPER-ONE, e.g.

nodes 410, 420, etc.;

- the IC system consists of:

a) connecting pipes, i.e. hydraulic volumes 500 and 540 (37 nodes) connecting the IC to

the primary circuit;

b)the heat exchange zone constituted by parallel tubes (i.e. hydraulic volume 515), inlet

and outlet plena, (i.e. hydraulic volumes 510 and 520) and single outlet tube i.e.

hydraulic volumes 525 (21 nodes);

c) the pool where the following zones can be recognized:

cl) the heat transfer region internal to the shroud i.e. hydraulic volumes 552, 560 and

561 (14 nodes);

c2) the outer annulus, i.e. hydraulic volumes 652, 660 and 661 (14 nodes);

c3) plenum regions, i.e. hydraulic volumes 551 and 562 (2 nodes);

c4) external pipes, i.e. hydraulic volumes 563 and 564 (44 nodes);

= structures are connected with each hydraulic volume: pipe walls have been separated

from flanges;

- the active structures of the rod simulators have been subdivided into 10 radial meshes.

28
NODE VOLUME HEIGHT/LENGTH ZONE

(m31103) (in)

100-01 3.212 0.3

110-01 2.677 0.25

110-02 2.677 0.25 Lower plenum

110-03 1.545 0.1443

110-04 1.545 0.1443

110-05 1.193 0.1114

111-01 1.730 0.1615

112-01 1.713 0.16

115-01 1.869 0.1745

120-01 1.944 0.2

120-02 1.944 0.2

130-01 1.488 0.176

135-01 1.692 0.2

140-01 1.692 0.2

325-01 1.393 0.327

330-01 0.85 0.185

335-01 1.079 0.257

335-02 1.079 0.257

335-03 1.943 0.257

335-04 1.943 0.257

345-01 1.21 0.16

345-02 0.247 0.18

345-03 0.247 0.18

345-04 0.343 0.25

345-05 0.343 0.25

TOTAL 34.961

200-01 0.78 0.265

200-02 0.78 0.265 Core

200-03 0.78 0.265

200-04 0.78 0.265

200-05 0.78 0.265

200-06 0.78 0.265

200-07 0.78 0.265

200-08 0.78 0.265

200-09 0.78 0.265

200-10 0.78 0.265

Tab. V - Details of nodes geometry in the RELAP5 nodalization

29
NODE VOLUME HEIGHT/LENGTH ZONE

(m3xt03) (M)

200-11 0.78 0.265

200-12 0.78 0.265

200-13 0.78 0.265

200-14 0.78 0.265

200-15 0.814 0.229

200-16 0.711 0.2

TOTAL 12.445

145-01 0.057 0.2 Bypass

145-02 0.057 0.2

145-03 0.054 0.1892

145-04 0.054 0.1892

145-05 0.054 0.1892

145-06 0.054 0.1892

145-07 0.054 0.1892

150-01 0.976 0.2468

150-02 0.976 0.2468

150-03 0.976 0.2468

150-04 0.976 0.2468

150-05 0.976 0.2468

155-01 0.186 0.223

160-01 0.178 0.2133

160-02 0.178 0.2133

160-0_3 0.178 0.2133

160-04 0.178 0.2133

160-05 0.178 0.2133

160-06 0.178 0.2133

160-07 0.178 0.2133

160-08 0.178 0.2133

160-09 0.178 0.2133

160-10 0.178 0.2133

165-01 0.168 0.2015

170-01 0.196 0.235

170-02 0.196 0.235

170-03 0.196 0.235

170-04 0. 196 0.235

170-05 0. 196 0.235

170-06 0.196 0.235

170-07 0. 196 0.235

170-08 0. 196 0.235

170-09 0. 196 0.235

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

30
NODE VOLUME HEIGHT/LENGTH ZONE

(m3x10 3) (W)

170-10 0.196 0.235

175-01 0.173 0.2075

180-01 0.211 0.1776

180-02 0.211 0.1776

180-03 0.211 0.1776

180-04 0.211 0.1776

TOTAL 10.400

205-01 1.262 0.22 Upper plenum

210-01 2.262 0.22

220-01 2.200 0.214

220-02 2.200 0.214

TOTAL 8.924

220-03 0.5651 0.2345

220-04 0.5651 0.2345

220-05 0.5651 0.2345

220-06 0.5651 0.2345

220-07 0.5651 0.2345

220-08 0.5651 0.2345

220-09 0.5651 0.2345

220-10 0.5651 0.2345

220-11 0.5651 0.2345

220-12 0.5651 0.2345

220-13 0.5651 0.2345

220-14 0.5651 0.2345

220-15 0.5651 0.2345

220-15 0.5651 0.2345

220-16 0.5651 0.2345

220-17 0.5651 0.2345

220-18 0.5651 0.2345

220-19 0.5651 0.2345

220-20 0.5651 0.2345

225-01 2.447 0.34

230-01 3.684 0.512

230-02 3.375 0.469

230-03 3.375 0.469

230-04 3.375 0.469

230-05 3.375 0.469

230-06 3.375 0.469

230-07 3.375 0.469

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

3'
NODE VOLUME HEIGHT/LENGTH ZONE

(m3

xt03 ) (m)

230-08 3.375 0.469

235-01 2.554 0.246

240-01 2.595 0.25

240-02 2.595 0.25

240-03 2.595 0.25

240-04 2.595 0.25

245-01 3.789 0.365

250-01 1.555 0.289

250-02 1.555 0.289

250-03 1.555 0.289

250-04 1.555 0.289

250-05 1.555 0.289

255-01 1.647 0.289

255-02 1.647 0.289

255-03 1.647 0.289

255-04 1.647 0.289

255-05 1.647 0.289

260-01 1.662 0.25

260-02 1.662 0.25

260-03 1.662 0.25

260-04 1.662 0.25

265-01 1.635 0.246

280-01 0.418 0.3295

280-02 0.418 0.3295

TOTAL 81.7548

270-01 1.367 0.247 Downcomer and jet pump

275-01 2.009 0.362

275-02 2.009 0.362

275-03 2.009 0.362

275-04 2.009 0.362

280-01 1.660 0.3

285-01 1.660 0.3

285-02 1.660 0.3

285-03 1.660 0.3

285-04 1.660 0.3

285-05 1.660 0.3

285-06 1.660 0.3

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

32
NODE VOLUME HEIGHT/LENGTH ZONE

(m311O3) Wm

295-01 1.078 0.39

295-02 1.078 0.39

300-01 0.988 0.283

305-01 1.012 0.29

305-02 1.012 0.29

305-03 1.012 0.29

305-04 1.012 0.29

305-05 1.012 0.29

305-06 1.012 0.29

305-07 1.012 0.29

305-08 1.012 0.29

310-01 1.385 0.325

315-01 0.355 0.273

315-02 0.355 0.273

315-03 0.355 0.273

315-04 0.355 0.273

315-05 0.355 0.273

315-06 0.355 0.273

315-07 0.355 0.273

315-08 0.355 0.273

315-09 0.355 0.273

315-10 0.355 0.273

315-11 0.355 0.273

315-12 0.355 0.273

315-13 0.355 0.273

315-14 0.355 0.273

315-15 0.355 0.273

320-01 0.737 0.273

320-02 0.737 0.273

320-03 0.737 0.273

320-04 0.737 0.273

320-05 0.737 0.273

320-06 0.737 0.273

320-07 0.737 0.273

320-08 0.737 0.273

320-09 0.737 0.273

320-10 0.737 0.273

320-11 0.737 0.273

320-12 0.737 0.273

320-13 0.737 0.273

320-14 0.737 0.273

320-15 0.737 0.273

TOTAL 49.849

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

33
NODE VOLUME HEIGHT/LENGTH ZONE

(m3xlO3) Wm

360-01 1.926 0.429 Filler

370-01 2.379 0.53

370-02 2.379 0.53

370-03 2.379 0.53

370-04 2.379 0.53

370-05 2.379 0.53

370-06 2.379 0.53

370-07 2.379 0.53

IC

500-01 0.141 0.38

500-02 0.141 0.38

500-03 0.141 0.38

500-04 0.141 0.38

500-05 O0.141 0.38

500-06 0.115 0.312

.500-07 0.115 0.312

500-08 0.115 0.312

500-09 0.115 0.312

500-10 0.078 0.212

510-01 0.12 0.2

515-01 0.1927 0.0632

515-02 0.1927 0.0632

515-03 0.1927 0.0632

515-04 0.1927 0.0632

515-05 0.1927 0.0632

540-01 0.089 0.35

540-02 0.089 0.35

540-03 0.120 0.472

540-04 0.120 0.472

540-05 0.120 0.472

540-06 0.120 0.472

540-07 0.120 0.472

540-08 0.120 0.472

540-09 0.120 0.472

540-10 0.120 0.472

540-11 0.120 0.472

540-12 0.120 0.472

540-13 0.120 0.472

540-14 0.120 0.472

540-15 0.120 0.472

540-16 0.120 0.472

540-17 0.120 0.472

540-18 0.120 0.472

540-19 0.120 0.472

540-20 0.120 0.472 1

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

34
NODE VOLUME HEIGHT/LENGTH ZONE

(M3,103) (M)

540-21 0.120 0.472

540-22 0.120 0.472

540-23 0.102 0.4

540-24 0.076 0.3

540-25 0.089 0.35

540-26 0.089 0.35

540-27 0.089 0.35

TOTAL 5.2295

551-01 55.755 0.07875 IC Tank

552-01 7.875 0.07875

560-01 7.875 0.07875

560-02 7.875 0.07875

560-03 7.875 0.07875

560-04 7.875 0.07875

560-06 7.875 0.07875

560-07 10.0 0.1

560-08 5.1 0.1

560-09 5.5 0.0632

560-10 5.5 0.0632

560-11 5.5 0.0632

560-12 5.5 0.0632

561-01 5.5 0.0632

562-01 65.9 0.1

652-01 47.88 0.07875

660-01 47.88 0.07875

660-02 47.88 0.07875

660-03 47.88 0.07875

660-04 47.88 0.07875

660-05 47.88 0.07875

660-05 47.88 0.07875

660-06 47.88 0.07875

660-07 60.8 0.1

660-08 60.8 0.1

660-09 38.43 0.0632

660-10 38.43 0.0632

660-11 38.43 0.0632

660-12 38.43 0.0632

TOTAL 868.29

Tab. V - Details of nodes geometry in the RELAP5 nodalization (cont'ed)

35
SIGNIFICANT FLOW AREA KD KR POSITION

JUNCTION m2xl04

primary loop:

130-02 2.86 0. 0. bypass inlet

140-02 5.938 0.19 0.9 core inlet

205-01 16.49 14.5 10.6 core outlet

205-02 8.3 0.1 0.1 bypass outlet

220-02 24.1 0. 0. separator inlet

235-01 24.1 0. 0. separator outlet

235-02 3.94 100. 100. separator annulus

235-03 42.6 0.1 0.1 steam dome lower connection

245-02 53.82 0.1 0.1 steam dome upper connection

310-02 27. 0. 0. lower downcomer annulus

310-03 13. 1. 1. jet pump inlet

340-00 8.5 1. I. lower plenum valve

IC loop

505-00 3. 10. 10. top valve

510-01 3.7 0.1 0.1 inlet pipe

510-02 3. 0.1 0.1 tube inlet

520-01 3. 0.1 0.1 tube outlet

520-02 1.7 0.1 0.1 outlet pipe

550-00 0.06 300. - bottom valve

Tab. VI - Details of relevant junction related parameters of RELAP5 nodalization

36
5i5

570

175

_ 1 0 250

260

6 0 0

m7

220

290 m0

IC TANK

as

LI

go

a 10

200

S40 370

0

320

It 160 0

0

a

120

c C= ,"=

. = .. . 340 -.... ...

1332

345 335 I IJ

a 0 PIPER-ONE =

Fig. 29 - Nodalization of PIPER-ONE loop

37
38
4. ANALYSIS OF POST-TEST CALCULATION RESULTS

The prc-test results, that have been the basis for the design of the PO-IC-2

experiment, arc not comparable with the actual data because of the differences between

specified and actual values of the initial and boundary conditions. In particular, as already

mentioned, the electrical power supply to the fuel rod simulator was limited to less than

100 kW.

For these reasons, the post-test analysis has comprised three phases:

1. achievement of good comparison between calculated and predicted trends of available

primary circuit data;

2. definition of a reference calculation on the basis of the above activity;

3. execution of a series of sensitivity calculations aiming at reaching the stated objectives.

In the frame of the analysis at item I., boundary and initial condition values related to

the primary loop have been changed within the presumed experimental error bands, up to

getting a satisfactory comparison between predicted and measured time trends in the

primary circuit itself.

Once this process ended (this required a somewhat large effort because of the relative

low power of the expcriment+), the reference calculation results were also compared with

the experimental values in the IC system (phase 2.).

The phase 3. of the analysis consisted of five different steps aiming at the evaluation

of:

3a) influence of code version;

3b) influence of selected initial/boundary condition values;

3c) user effects;

3d) nodalization effects;

3c) sensitivity of code results when a geometric/hydraulic relevant parameter is changed in

the input deck;

An additional calculation (identified as IC37 in the following) was performed to

confirm the conclusions related to the reasons why IC flowrate remains constant when

varying core supplied power; this is included in the above group 3e).

Finally, the results of a scaling analysis are shown; these demonstrate the suitability

of the data base in relation to scenarios expected in SBWR plants (sect. 4A).

4.1 Steady state calculations (Phase I of the post-test analysis)

As already mentioned, the main objective of the calculations was to match the

primary circuit pressure trend.

The initial condition at the assumed "time zero" in the experiment was achieved at

zero core power and zero flows inside feedwatcr and steam lines and at core inlet;

structures heating systems were active to compensate heat losses to environment.

The very first series of calculations was carried out changing:

* the fluid temperature values around the loop (+/- 3K around the saturation value);

+ This means that minor variations in the boundary and initial condition values (e.g. changes of heat losses

of +/-I kw, of initial downcomer level of +/-0.2 m, of the timing of opcning/closure of IC valves of 2 s,

consideration of primary circuit leaks as low as 0.0001 kg/s) have a sensible cffcct on primary pressure

values as it happens in all tests performed at low power in any experimental racility, temperatures

imbalances in the fluid and in the structures with main reference to the thick flanges.

39
* the heat losses to environment (in the range 0 - 5 kW) and the related spatial

distribution, excluding the heat losses through the chamber of rods electrical connectors

(see below);

* downcomer and core regions level (in the range +I- 1 m around the available

experimental value).

Subsequently, a leak was introduced in the lower downeomer (leak flow varied in the

range 0. - 0.05 kg/s starting from 600 s into the transient). Moreover, the time trend of the

heat losses across the rod connectors zone has also been varied during the transient

accounting for changes in the flows of the cooling nitrogen in this zone.

Finally IC valves characteristics, e.g. opening/closure time and actuation time (varied

in the ranges +/- I s and +/- 2 s, respectively) have been changed.

The final situation considered for initial and boundary conditions can be seen in

Tabs. VII and VIII including the comparison between calculated and measured (if

available) values.

It should be noted that almost 30 code runs were necessary to achieve the reported

final results.

The comparison between measured and calculated trends of primary pressure, lower

plenum temperature and levels in the core region and in the downeomer, is given in Figs.

30 to 33. The calculated trends have been obtained from the code run IC31 (see below). A

detailed analysis of the comparison can be found in sect. 4.2.

Here it is sufficient to emphasize three minor discrepancies in the pressure trend: - at the transient beginning owing to the initial fluid temperature stratification not

correctly considered in the code;

- during the phase of electrical power interruption mostly due to inadequate consideration

of heat input to the fluid from the structures heating system; - in the second phase of the test that is a consequence of the above.

The error in all the three cases is less than 0.1 MPa.

The measured lower plenum temperature is only bounded in the calculation (Fig. 3 1):

this is due to the position of the thermocouple that is close to the connection between the

main loop and the IC; in the Relap calculation an average volume related value is reported.

Larger differences appear from the level measurements (Figs. 32 and 33); in this case

the reliability of the experimental signal is quite low. In the frame of the performed

sensitivity calculations, it has been checked that large variations of these quantities (i.e.

greater than the actual differences between measured and calculated trends) do not cause

variations in the overall transient scenario with main reference to primary pressure and

flowrate across the IC.

40
PARAMETER UNIT EXP CALC (0)

LP pressure MPa 5.1 5.1

LP temperature 0C 262. 258.5

Core level m 11.9 11.8

DC level m 10.7 10.5

IC line fluid temperature 0C 17.5 is.

IC pool fluid temperature 0C 17.5 18.

IC mass flowrate kc/s 0. 0.

Core power kW 0. 0.

Primary system heat losses: *)

- core region kW - 1.97

- steam dome kW - 8.5

- separator annulus kW - --0.43

- upper downcomer kW - --0.39

- lower downcomer kW -_3.4

- LP/core inlet kW -_2.5

(0) Reference case (1C3 1)

(*) Sign "-" refers to power added to the fluid, sign +" to power lost

Tab. VII - Comparison between measured and calculated initial conditions

PARAMETER OR EVENT TIME

EXP CALC

Test initiation 0. 0.

Power versus time as in Table IV

IC top valve opens 4. 4.

IC bottom valve opens 32. 32.

IC top valve closes 508. 508.

IC bottom valve closes - 508.

IC top valve opens 602. 605.

IC bottom valve opens 602. 606.

IC top and bottom valve close 1106. 1106.

Tab. VIII - Comparison between measured and calculated boundary conditions

41
'Ua.

SI..

S

0.

5.750

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250

-200

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX 1031P130010000

YYY E12APA-LP-1

0 200 400 600 800 1000 1200

Time (s)

Fig. 30 - Measured and calculated trends of lower plenum pressure

CL

E

320.

300.

280.

260.

240.

220.

200.

180.

160.

140.

120. * -

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 31 - Measured and calculated trends of lower plenum temperature

42
13.000

12.500 1-

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC31CNTRLVAR20

VYY E12ALP-CC-1

12.000

-. 11.500 E

11.000

10.500

10.000

9.500

9.000

I I I I

9.500 ,

-20)0 0 200 400 600 800 1000

Time (a)

1200

Fig. 32 - Measured and calculated trends of core level

12.000

11.500

11.000

E 10.500

10.000

9.500

9.000

8.500

8.000 '.-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 33- Measured and calculated trends of downcomer level

43
4.2 Reference calculation results (Phase 2 of the post test analysis)

Each of the performed calculations (see below) has been evaluated on the basis of 39

time trends of selected thcrmalhydraulic quantities. These can be subdivided into three

main groups:

A) variables related to the primary circuit that have been selected considering the

availability of experimental data (the numbers into parentheses below refer to the

identification of figures in the Appendices):

- lower plenum pressure, (Fig. I);

- lower plenum fluid temperature, (Fig. 2).

- rod surface temperature at level 9, (Fig. 3);

- core region level, (Fig. 4).

- downcomer levels, (Fig. 5);

- core power, (Fig. 6);

B) variables related to the IC system that have been selected considering the availability of

experimental data: - mass flow rate, (Fig. 7);

- differential pressure across the IC, (Fig. 8);

- fluid temperatures along the IC system - primary side, (Figs. 9 - 12 and Fig. 27);

- wall temperatures in the IC system, (Figs. 13 - 18);

- fluid temperatures in the pool, (Figs. 19 - 26);

- exchanged power across the IC (Fig. 28);

- temperature difference between selected points (Figs. 29 - 3 1);

C) calculated variables related to the IC system that are relevant for understanding the

concerned phenomena and for evaluating the code behaviour

- heat transfer coefficients in the IC, (Figs. 32 - 34);

- void fractions inside the IC tubes, (Fig. 35);

- liquid and steam velocities inside the IC tubes, (Figs. 36 and 37); - internal and external heat transfer modes in the IC tubes (Figs. 38 and 39);

- differences between steam and liquid temperature of primary fluid (Fig. 40).

The reference calculation results, that is case IC3 1, are reported in App. I (Figs. I -

40) and arc discussed in the next section.

Computer related statistics

The calculations performed by RELAPS/Mod 3.1 have been run on the IBM RISC

6000, as results from sect. 3.1. The following relevant code run statistics applies

(specifically related to the IC3 1 calculation):

" CPU time is of the order of 20000 s (Fig. 41 in App. I);

* time step ranges between 0.05 and 0.1 s (Fig. 42 in App. I), with the exception of the

period of IC isolation.

The relation between code selected time step and imposed maximum time step can

be seen in Fig. 43 of App. 1.

44
4.2.1 Primary circuit behaviour

In order to better address the comparison between measured and calculated trends,

five phenomenological windows (Ph.W) can be distinguished looking at the primary circuit

pressure (Fig. 1):

* Ph.W I from transient beginning to 50 s: the prediction does not agree with the

experiment owing to minor errors in initial conditions: the presence of a cold patch of

liquid in the primary circuit (roughly 20 cm with less than 10 K of subcooling) or the

initial temperature of the IC inlet pipe can be considered for improving the agreement

between measured and calculated trends; however this does not affect the subsequent

transient;

* Ph.W 2 from 50 s to 440 s: this constitutes the low power part of the test. An excellent

qualitative and quantitative agreement between measured and calculated trends can be

observed: this demonstrates that the IC removed power is very well predicted;

* Ph. W 3 from 440 s to 650 s: this includes the power shut-off period (i.e. from 440 s to

588 s) and the period necessary to achieve a "quasi steady-state" in the high power part

of the test (i.e. from 588 s to 650 s). The disagreement in this Ph.W is mostly due to

wrong estimation of the behaviour of the structure heating system, to the inaccurate

modelling of the conduction heat transfer in the thick flanges (much larger number of

meshes is required) and to the phenomena that occur inside the IC after its isolation. In

particular, it is interesting to note that a sudden void collapse occurs in the IC primary

system after its isolation; this brings the pressure from about 4 MPa to saturation values

corresponding to the liquid temperature in the pool (i.e. of the order of 0.01 MPa). Two

main consequences in terms of code calculation are:

a) the time step required to predict the condensation shock is very low (of the order of

1.e-6 s) and the code appeared not qualified in this connection;

b) the test conditions (essentially the insurge of liquid into the IC line) resulting from the

shock occurrence affect the code prediction in the period 588 s to 650 s and are the

main reason for the discrepancy in this period;

* Ph.W 4 from 650 s to 1088 s: this constitutes the high power part of the test. An

excellent qualitative agreement between measured and calculated trends can be noted;

the difference between the two curves is a result of the previous Ph.W and is less than

0.1 MPa. Again the overall trend shows that the IC exchanged power is very well

predicted;

* Ph. W 5 from 1088 s to the end: power shutoff occurs in this period. The good

agreement between measured and calculated trends confirms that the energy balance is

well considered in the calculation.

It should be noted that the Ph.W 2 and 4 are of main interest in our study.

A few additional remarks related to the comparison between measured and predicted

trends of the remaining primary circuit related quantities (Figs. 2 - 6 of App. 1) are as

follows:

- the negative peaks in the measured lower plenum temperature (Fig. 2), as already

mentioned, are due to the cold water coming from the IC; a volume averaged value is

calculated by the code; the discrepancies during the Ph. W 3 are due to cold liquid

stratification caused by the cooling of the rod connectors chamber;

- discrepancies in the rod surface temperatures are essentially due to the position of the

thermocouple that does not coincide with the surface of the rod (Fig. 3);

- inaccuracies in the experimental signal and minor leaks from the primary circuit are to be

considered when examining the discrepancies in levels (Figs. 4 and 5 of App. 1), as well

as the fact that core and DC levels are influenced by the fluid velocity. However this does

not hold for the lower DC level measurement (signal LP-LD-1); a code inadequacy

45
seems evident in this respect;

- the calculated quantity is the heat transferred from' the rods to the fluid while the

experimental quantity is the electrical power supply to the rods: this explains the errors

(not present during the "quasi steady- state") in the core power curves (Fig. 6 of App. 1).

4.2.2 IC behaviour

Primary

The mass flowrate across the IC is quite well predicted by the code (Fig. 7 of App. 1);

the zero flow resulting from the turbine signal in the first 200 s is originated by a

malfunction of this device, as already mentioned. Peaks in the experiment during the Ph.W 1,

3 and 5 are not predicted. It can be concluded that the calculated result is within the

experimental error bands in the Ph. W 2 and 4 that are of main interest in the present study.

Some more work is necessary to qualify the measured pressure drop signal (Fig. 8);

nevertheless the prediction can be retained within the experimental error bands in the Ph. W

2 and 4.

The fluid temperatures at the IC inlet are represented in Figs. 9 and 27 of App. 1. The

agreement between measured and calculated trends is quite good during all the considered

Ph.W. Moreover, Fig. 27 shows that saturation temperature is measured and calculated

during the Ph.W 2 and 4 at the IC entrance. The presence of subcooled liquid at the IC inlet

during the Ph.W I and 3 can be deduced from the trends in Fig. 9, although information

about absolute pressure in the IC line is not available.

Fluid temperature is very well predicted by the code at the center of the IC: the

calculated trend (liquid temperature) lies between the two measured signals in Fig. 10 of

App. 1. Subcooling in the lowest three nodes of the IC can be deduced from the analysis of

Fig. 11 of App. 1: all the steam is condensed in the first two nodes in both the Ph. W 2 and 4.

The comparison of fluid temperatures at the outlet of the IC, Fig. 12 of App. 1,

confirms that the overall heat transfer to the pool is satisfactorily predicted by the

calculation: this appears to be true also considering separately the tubes region (where

both condensation and heat transfer to the pool from subcooled liquid take place) and the

single tube region (where only heat transfer to the pool from subcooled liquid takes place).

The data in Fig. 13 of App. 1 show an overestimation of the surface temperature by

the code: this is true for all the surface temperatures, i.e. both in the inner and in the outer

surface of the tubes, during the Ph. W 2 and 4, as it also results from Figs. 15, 16, 17, and

18 of App. 1. Considering that the overall power exchanged is quite well predicted, one can

deduce a code error in predicting the heat transfer coefficient either in the inner surface or in

the outer surface, either in both the surfaces (an average error of the external surface

temperature of 20 K results in underestimating the heat transfer coefficient of about 20% in

the conditions of Ph. W 2 at the top of the IC, see also sect. 4.2.3). This conclusion is also

supported by the observation that measured and calculated surface temperatures are very

close during the Ph. W 1, 3 and 5, i.e. when flowrate and exchanged power are nearly zero.

An abrupt external surface temperature change can be observed at about 900 s (Ph. W

4) in the calculation (Fig. 17 of App. 1): this is a consequence of a change in heat transfer

coefficient from mode 2 (forced convection) to mode 3 (nucleate boiling) as it results from

Fig. 39 of App. 1; mode 3 is also the heat transfer coefficient mode during the entire Ph. W

2 (Fig. 39).

Discrepancies between measured and calculated trends during the Ph. W 3 appear

from Fig. 18 of App. 1; in this connection it should be noted that in order to perform the

calculation in this Ph. W, it has been necessary to add two TMDPVOL and related

TMDPJUN connected with the IC nodes: the reason for adding these components was to

smooth the abrupt pressure collapse due to sudden condensation; the effect of the added

46
nodes can be seen, as far as Ph. W 3 is concerned, in the Fig. 18 of App. 1.

Pool

The good agreement between measured and calculated trends, of pool temperature at

different axial elevations (essentially, Figs. 19, 20, 23 and 24 of App. 1) constitutes an

independent proof of the agreement in the overall exchanged power. Three additional

aspects should be noted from the analysis of figures from 19 to 26 of App. 1:

- changes in the slope of the predicted trends during the Ph. W 3 (e.g. Fig. 19) are due to

the necessity of the TMDPVOL discussed in the previous paragraphs;

- discrepancies in some measured and predicted trends (e.g. Fig. 20 or Fig. 26) are either

of minor importance (only 3 K in Fig. 26, within the experimental error band), either due

to different positions considered in the calculation and in the experiment (Fig. 20);

- external and internal side pool temperature are nearly the same demonstrating that

conduction across the shroud prevents the possibility of establishing sufficient

temperature difference to give rise to natural circulation inside the pool.

In definitive, from observing:

a) fluid temperature at IC inlet, outlet and inside IC,

b) surface temperatures in the tubes and,

c) fluid temperature in the pool,

it can be deduced that variables a) and c) are well predicted (also flowrate and overall

exchanged power are well predicted); but, variables b) are overestimated. The conclusion is

that the heat transfer coefficients across the tubes (either on the internal or external surface)

are calculated with some error (see sect. 4.2.3). Figures from 29 to 31 of App. I support

this conclusion.

Furthermore, the temperature increase in the pool results from Fig. 3 1: the smooth

increase of fluid temperature in the pool leads to a smooth decrease of the temperature

difference between tubes inner wall surface temperature and pool temperature itself.

Removed power remain constant: this means an average increase of the overall heat transfer

coefficient during the experiment.

Calculated quantities

As already mentioned, calculated quantities that have not a corresponding measured

trend are reported in Figs. 32 - 40 of App. 1.

As far as heat transfer coefficients are concerned during the Ph.W 2 and 4, the

following observations can be made (Figs. 33 to 35 and 38, 39 of App. 1; inner and outer

coefficients can be recognized by the last two digits in the variables labels at the right

uppermost corner in the figures, "00" and "01", respectively):

- in the upper zone of the tubes Heat Transfer Coefficients at the inner wall (HTCI) are

always smaller than Heat Transfer Coefficients at the outer wall (HTCO); in particular

average values of HTCI and HTCO are 15000 and 18000 W/m2K, respectively;

- both HTCO and HTCI become noticeably lower along the axis reaching values as low as

1200 W/m2/K for HTCO in the bottom of the IC tubes;

- at the bottom of IC tubes HTCO is much smaller than HTCI, thus controlling the overall

heat transfer process;

- the effect of the sharp transition from mode 2 to mode 3 of the HTCO can also be

observed in Fig. 33 at about 900 s into the transient (see also Fig. 39 and the previous

discussion);

- no sharp transitions during PH.W 2 and 4 can be observed in HTCI (Fig. 38).

The void fraction trends along the axis confirm that condensation is predicted only in

the top two nodes simulating the IC tubes (Fig. 35): only liquid is present in the bottom

three nodes during the whole experiment.

47
As reasonable, higher liquid velocities are calculated in the upper two nodes (liquid is

entrained by steam, Fig. 36) than in the bottom three nodes.

An apparently unphysical steam velocity trend is calculated in the central node

(upward oriented steam velocity in a node where void fraction is zero), Fig. 37: this does

not happen in the two lowest nodes.

The degree of subcooling calculated for each of the 5 nodes representing the IC tubes,

can be drawn from Fig. 40 of App. 1. It can be noted that, in the second IC node from the

top (where both steam and liquid are simultaneously present and predicted void fraction

around 0.9, Fig. 35), roughly 20 K subcooling are calculated during both Ph.W 2 and 4.

4.2.3 Heat transfer coefficient across the IC tubes

In order to better understand the comparison between calculated and experimental

data in the reference calculation, relevant data were put in the frame of the Tabs. IXa and

IXb, considering the Ph.W 2 and 4, respectively.

Each row deals with one of the five axial zones in which the IC tubes have been

subdivided.

The. first four columns deal with measured and calculated values of temperature

differences between primary fluid and inner surface (Tfi and Twi) and between outer surface

and pool fluid (Two and Tfo). If surface temperature is not available from the experiment at

a given level, the assumption is made, for that level, that calculated fluid temperature is the

same in the experiment. This is justified by the comparisons between measured and

calculated fluid temperatures (Figs. 9, 10, 12, 19, 20, 23, 24 of App. 1).

The second group of four columns deals with calculated values of exchanged power

across each axial level at the inner (subscript "i") and at the outer surface of the IC tubes

(subscript "o"). The four values of power (symbol "PO"), from left to right in the tables,

have been calculated starting from inner "HTC", outer "HTC", inner "Q" value and outer

"HTRNR" values, respectively (HTC, Q and HTRNR are Relap5 output quantities).

The following remarks can be done from the analysis of the tables, with reference to

both the selected phenomenological windows:

* exchanged power is much higher in the uppermost two nodes than in the remaining three

bottom nodes;

* power calculated from the HTC is not consistent with actual value at the inner surface in

the uppermost three nodes; * only one temperature difference has been obtained for the inner surface: this seems not

enough to draw conclusions; * experimental temperature differences at the outer surface are substantially lower than

calculated values (factor 1.5 - 2): calculated heat transfer coefficient can be retained

underestimated for the same amount. The presumable error coming from "fin" effect

introduced by the externally welded thermocouples has not been considered in this

conclusion.

In the above analysis, the assumption has been made that the phenomenon is quasistationary: this is supported by the time trends of the main quantities. Furthermore, the

good agreement between measured and calculated levels (pressure drop inside the tubes)

confirms this assumption.

48
Ph.w.2 (300. s)

IC TfI Twi Two- Tfo POi POO poQ, poHo

ZONE (K) (K) (kW) (kW) (kW) (MW)

EXP CALC EXP CALC CALC CALC CALC CALC

1 106. (2) 39 50. (0) 76 21.8 73. 22. 23.3

2 - 70.5 68.0) 84.5 11.2 59. 6+23 14+17

3 - 61. 50.(2) 85. 6. 30. 6. 6.

4 - 53. - 62. 4.5 4.5 4.5 4.5

5 - 43.5 32.(2) 50. 3.2 3.1 3.2 3.1

Twi/o =

Poi POO =

POo~ =

poQ, i =

poH,o =

(I) -

(2) --

inside/outside fluid temperature

inside/outside wall surface temperature

inside exchanged power evaluated from HTC

outside exchanged power cvaluatcd from HTC

inside exchanged powcr calculated by code (variable "Q")

outside exchanged power evaluated from heat flux (variable "HTRNR")

actual value

experimental fluid temperature equal to calculated one

Tab. IXa - Evaluation of the heat transfer coefficient (Ph.w.2)

Ph.w.4 (900. sIC Tfi - TWi Two - Tfo POi Poo poQj poH,o

ZONE (K) (KW) (KW) (KW) (KW) (KW)

EXP CALC EXP CALC CALC CALC CALC CALC

1 94. (2) 33.5 25. (1) 44 22.8 4.6. 22.7 22.7

2 45.5 35. () 65 17.5 54. 5.2-22 19-15

3 61. 43. (2) 65. 5.7 22.9 5.5. 5.5

4 50. 53. 4.1 4.1 4.3 4.2

5 40.7 31.( 2 ) 44. 3. 3. 3.1 3.1

TWO0 =

Poi =

PO0J =

poQi =

(1) =

(2) =

inside/outside fluid temperature

inside /outside wall surface temperature

inside exchanged power evaluated from HTC

outside exchanged power evaluated from HTC

inside exchanged power by code (variable "Q")

outside exchanged power evaluated from heat flux (variable "HTRNR")

actual value

experimental fluid temperature equal to calculated one

Tab. IXb - Evaluation of the heat transfer coefficient (Ph.w.4)

49
4.3 Sensitivity Calculations (Phase 3. of the Post-test analysis)

A large number of sensitivity calculations has been carried out as results from Tab. X,

where the varied parameters have been reported together with some qualitatively significant

effects on the results.

The calculation ICA6 was carried out with rough boundary conditions, already

producing a "good" overall agreement with experimental data (App. 4). After that, some

"tuning", changing the parameter values within the experimental error bands, was done:

almost 30 calculations were performed, among which the IC19-IC31 specifically mentioned

in Tab. X.

The result of the tuning was the reference calculation IC31 (App. 1).

Calculations from IC28 to IC36 in Tab. X aimed at finding parameters having large

influence on the results: e.g. it was found that conduction heat transfer mesh size has almost

no effect on the results (calculation IC32), while IC tubes node length introduces heavy

oscillations in the relevant output quantities (calculation IC34).

Finally, calculation IC37 (App. 3) was carried out as a counterpart of calculation IC3 I

to demonstrate the influence of the presence of a large parallel circuit (i.e. vessel

downcomer) upon the IC global performance.

CODE RUN CHARACTERISTICS/VARIED PARAMETERS MAIN RESULTS

ICA6 (I) Rough boundary conditions Overall system behaviour

qualitativeiy predicted

IC19+lC27 Sensitivity analyses - varied parameters: Effects on primary system response;

- heat losses (value and distribution) minor changes on IC behaviour

- core and downcomer initial levels;

- core and downcomer initial liquid temperature

distribution;

- leaks in primary system;

- IC valves operation.

IC3 !(2) Reference case

lC28-IC30 Liquid insurge in the IC line during the power Effect on primary system pressure

switch-off and IC isolation phase. soon after the power switch-on and

Varied parameter: IC restart

- IC boundary condition modelling

Heat exchanger modelling.

IC32 Varied parameter

- IC tube structure mesh size No effect

1C33/1C36 (3) - Heated diameter of IC tube wall external side Large effect on IC outlet liquid

temperature

1C34 - IC tube node number Small effects on IC fluid

temperature distribution and

primary system behaviour

Strong oscillations in the wall

surface temperature of IC tubes

IC35 - IC tube material thermal conductivity Small effects

IC37 (4) Recirculation rate in primary system.

Varied parameter Step increase in IC mass flow rate

- LP valve closure during transient

(I) Results in Appendix 4

(2) Results in Appendix I (3) Results in Appendix 2

(4) Results in Appendix 3

Tab. X - List of calculations and varied parameters

50
4.3.1 Significant results

Five main groups of calculations have been distinguished following the discussion under

sect. 4. These are classified in Tab. XI where the varied parameter ranges are reported, if

applicable. In the last part of Tab. XI, the differences between measured and calculated

values of surface temperature in the lowest node of the IC tubes, are reported too. This is

done at 100, 300 and 1000 s into the transient, the first two values belonging to Ph.W 2 and

the last one to Ph.W. 4. It can be noted that in almost all the cases, calculated outer surface

temperature values are larger than measured values (the consideration about possible

thermocouples "fin" effect should be made here, too). Assuming that heat transfer power

and fluid temperature are the same in the experiment and

concluded that calculated HTC values are lower than in the

from sect. 4.2.3.

in the calculation, it can be

experiment, as it also results

GROUP CASE VARIED PARAMETER EFFECT ON PREDICTED

IC PERFORMANCE

(TS4C-7) - M1TEMPIS5I0) 100.s 300.s 1000.5

3a) USED CODE VERSION

INFLUENCE OF IC31" RELAPS/Mod3.1 -16.9 -17.1 -12.

CODE VERSION IC7J RELAP5/Mod3V7J -14.6 -0.1 -

ICV8 RELAP5/Mod3V80 -14.8 -0.4 -

ICM2 RELAPS/Mod2.5 -14.7 -14.8 -17.1

3b)

INFLUENCE OF

INITIAL AND BOUNDARY IC31 INITIAL AND -16.9 -17.1 -12.

CONDITIONS ICA6* BOUNDARY CONDITIONS -12.9 -13.3 -4.6

3c)

USER EFFECT IC31 IN/OUT FLOW TO -16.9 -17.1 -12.

IC28 IC CONTROL VOLUMES -16.7 -16.7 -11.8

IC29 -16.9 -16.9 -11.4

_____________IC30(°) -16.9 -17.2 -

3d) MESH NUMBER OF IC

NODALIZATION EFFECTS PIPE WALL:

IC31* 10 -16.9 -17.1 -12.

IC32 20 -17.1 -17.5 -12.4

NODE NUMBER OF IC

PIPE AND CORRESPONDING

INTERNAL POOL ZONE:

IC31 5 -16.9 -17.1 -12.

IC34 10 -10.6 -14.6 -4.4

IC PIPE MATERIAL

THERMAL CONDUCTIVITY

IC31 STANDARD STEEL -16.9 -17.2 -12.

1C35 STANDARD STEEL *2 -17.3 -17.5 -12.3

3c) HEATED DIAMETER IN THE

CHANGES OF RELEVANT EXTERNAL SIDE OF IC PIPE

PARAMETERS WALL:

IC31* 0.005 m -16.9 -17.1 -12.

IC33 0.1 m -43.7 -44. -37.3

IC36 0.001 m -3.0 -3.4 0.3

IC37 LP-VALVE CLOSURE AT

1300.$ IN THE TRANSIENT -16.6 -17.2 -31.9

without control volumes in the IC * Results in Appendix (see Tab. X)

Tab. XI - Documented calculations

..... f

51
In all cases, six quantities have been selected to characterize the influence of the

varied parameter:

- lower plenum pressure; - IC tubes surface temperature (external side level 3);

- IC tubes internal fluid temperature (level 3);

- IC outlet fluid temperature;

- IC HTC inside tubes (level 3);

- IC HTC outside tubes (level 3).

0

0.

3

3

b.

0.

5.750

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250 " -200 0 200 400 600 800 1000

Time (s)

1200

Fig. 34 - Lower plenum pressure

52
160.

140.

120.

100.

80.

60.

SII40.

20.

O. ' ' I I

-200 0 200 400 600 800

Time (s)

Fig. 35 - IC tubes wall surface temperature (external side level 3)

1000 1200

350.

300.

250.

200.

150.

PIPER-ONE Test PO-1C-2A

Post-test calculation

3a Influence of code version

MA

EI2ATF-1C-1

EI2ATF-1C-2

IC31TEMPF51 5030000

IC7JTEMPF515O30000

ICV8TEMPF515030000*

ICM2TEMPFS51530000

E

a

100.

-0. -200 0 200 400 600 800 1000

Time (s)

1200

Fig. 36 - IC tubes fluid temperature (middle elevation)

53
140.

PIPER-ONE Test PO-IC-2A

Post-test calculation

3a Influence of code version

XXIC3ITEMPF525O6000

YYY IC7JTEMPF525O6000

ZZZ ICVBTEMPF52506000

M# ICM2TEMPF52506000 120.

100.

* 80.

I 60.

40. F

20.

I

I d • • I • • | ni I

I I --- - - -

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 37 - IC outlet fluid temperature

xlO 4

3.50

3.00

* I I I I I

S

Al

2.50 -

2.00 F

7 I I I I I

PIPER-ONE Test PO-IC-2A

Post-test calculation

3a Influence of code version

XXX IC31HTHTC515000200

YYY IC7JHTHTC515000200

ZZZ ICVSHTHTC515000200

#S ICM2HTHTC515000200

1.50

1.00

0.50

0.00

n • |

-0.50

-20'0 0 200 400 600 800 1000 1200

Time (s)

Fig. 38 - Heat transfer coefficient at the Inside of IC tubes wall (level 3)

54
x 10

E

4

2.25

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

0.00

-0.25

-200

SPIPER-ONE Test PO-IC-2A

Post-test calculation

3a Influence of code version

'X*1031 HTHTC515000201

YYY IC7JHTHTC5ISO02OI

ZZZ ICVSHTHTC515000201

M# ICM2HTHTC5I 5000201

I I I I I - I - I I - - B I I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 39 - Heat transfer coefficient at the outside of IC tubes wall (level 3)

CL

C0,

S

a.

5.750 "

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250

-200

m

PIPER-ONE Test PO-IC-2A

Post-test calculation

3b Influence of I/B condition values

XXX EI2APA-LP-1

YYY IC31P130010000

ZZZ ICASPI30010000

I * I I I I I

I m

m B B m i

0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 40 - Lower plenum pressure

55
Influence of code version

The nodalization used for calculation IC31 has been modified (if necessary) and run

with different code versions as specified in Tab. XI. The six selected quantities are

compared in Figs. 34 to 39. Primary pressure is not very much affected by code version

(Fig. 34). Overestimation of external temperature appears from all code versions (Fig. 35).

The unphysical behaviour for fluid temperature already noted in the analysis of the

experiment PO-SD-8 by the 7J code version (ref. /6/), can also be noted in Figs. 36 and 37

also with reference to the v80 version.

Internal heat transfer coefficient is oscillating only in Relap5/mod3.1 (Figs. 38 and

39); HTC values are lower in the case of v 3.1. Calculations with 7J and v80 versions

stopped at almost 500 s into the transient.

Influence of initial and boundary conditions

A large number of boundary conditions has been varied between ICA6 and IC31

calculations (ICA6 can be retained a blind post-test), as already mentioned. Differences in

the results can be appreciated looking at figures from 40 to 45.

The influence of the considered changes cannotbe retained relevant as far as the IC

behaviour is concerned. HTC are lower in ICA6 than in IC3 1 calculations (Fig. 45).

User effects

Almost arbitrary conditions were imposed to run the calculations during PH.W 3,

attempting to prevent calculation failure due to shock condensation.

Mostly, changes in the duration and phenomenology of Ph.W 3 can be noted in the

results (Figs. 46 to 51); the influence on the subsequent Ph.W 4 seems negligible.

Nodalization effects

The studied nodalization effects include the increase. in the number of conduction heat

transfer meshes and the increase in the number of hydraulic nodes, (calculations IC32 and

IC34 in Tab. XI, respectively). The change of steel conductivity (calculation IC35 in

Tab. XI) has also been included in this group, although it could have been in the calculation

group 3e) of Tab. XI. The results are shown in Figs. 52 - 57 with reference to the chosen

six quantities: IC31 results are also reported.

The effects of these variations at a global level, i.e. considering primary circuit

pressure (Fig. 52) or fluid temperature at the IC outlet (Fig. 55) are negligible. However,

local effects can be very important as shown by the inner wall surface temperature in Fig. 53

and by the heat transfer coefficient in Fig. 57.

In particular the comparison of IC34 and IC31 related trends in Fig. 57 leads to the

conclusion that (condensation) heat transfer coefficient should be in someway connected

with node dimensions: a given HTC correlation can produce satisfactory results with nodes

of given dimensions, but unacceptable results if node dimensions are changed.

Changes of relevant parameters

For simplicity, only the effect of hydraulic diameter change in the secondary side of

the IC is discussed under this item. Calculations IC33 and IC36 are characterized by

hydraulic diameters 20 times and 5 times, respectively, larger and lower than the value of

the same quantity in calculation IC31. Relevant results are shown in Figs. 58 - 63.

This quantity has a strong effect both regarding primary pressure (Fig. 58) and IC related

quantities, like fluid temperature at the outlet (Fig. 61) and heat transfer coefficient (Fig. 63).

The judgement about the preferable value for hydraulic diameter is difficult from the

presented data.

56
160.

140.

120.

a I I I 1 9 5 S

PIPER-ONE Test PO-IC-2A

Post-test calculation

3b Influence of I/B condition values

XXX EI2ATS-IC-3

YYY IC31HTTEMP515000210

ZZZ ICA6HTTEMP515000210

E

A2

100. 1-

80.

60.

40.

20.

0.

-20

a a I I I a ff I I I I a I 1 p

10 0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 41 - IC tubes wall surface temperature (external side level 3)

300.

250.

200.

150.

100.

E

A2

50.

0. L-

-200 0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 42 - IC tubes fluid temperature (middle elevation)

57
140.

PIPER-ONE Test PO-IC-2A

Post-test calculation

3b Influence of I/B condition values

XXX IC31TEMPF525060000

YYY ICASTEMPF525060000

120.

100. I

S

i

E

0

80.

60.

* I

* I

* I

40. F* I

20. j

I

• I I • I I I •

0.

-200 0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 43 - IC outlet fluid temperature

xl10 4

3.00

2.50

E 2.00

. 1.50

S 1.00 C

0.50

0.00

| |

I • -. -

PIPER-ONE Test PO-IC-2A

Post-test calculation

3b influence of I/B condition values

XXX ICA6HTHTC515000200

YYY IC31 HTHTC515000200

- I

- I

.~X~L4/

I

Lf_ . . * . .I .. --- I a

-200 0 200 400 6oo

Time (s)

800 1000 1200 1400

Fig. 44 - Heat transfer coefficient at the Inside of IC tubes wall (level 3)

58
x 10

_E

C

i

b.

4

2.25

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

0.00

PIPER-ONE Test PO-IC-2A

Post-test calculation

3b Influence of 1/8 condition values

)=c ICAGHTNTC515000201

YYY 1031 HTHTC51 5000201

a * a I a * a i a a a a * a a "Vdr.•l-2200 0 200 400 600 800 1000

Time (s)

Fig. 45 - Heat transfer coefficient at the outside of IC tubes wall (level 3)

1200 1400

5.750-

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250 L

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 46 - Lower plenum pressure

59
160.

140.

120.

100.

80.

60.

0

I.-

40.

20.

0.

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 47 - IC tubes wall surface temperature (external side level 3)

0

a.

2

I.-

350.

300.

250.

200.

150.

100.

50.

0. '-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 48 - IC tubes fluid temperature (middle elevation)

60
140.

120.

100.

80.

E 60.

40.

20.

o. L

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 49 - IC outlet fluid temperature

4 x 10 2.00

1.75

PIPER-ONE Test PO-IC-2A

Post-test calculation

3c User effects

XXX 1C31 HTI4TC51 5000200

YYY 1C28HTHTC5I5000!00

ZZZ IC29HTHTC51 50000

### IC30HTHTC5I SO!0fO

2

*5I

0

L.

S

a

C

S

h..

S

S

1.50

1.25

1.00

0.75

0.50

0.25

0.00

I

-0.25 '-

-20)0 0 200 400 600 800 1000 1200

Time (s)

Fig. 50 - Heat transfer coefficient at the Inside of IC tubes wall (level 3)

61
x 0 4

2.25

2.00

1.75

1.50

S 1.25

1.00

0.75

0.50

0.25

0.00 L

-0.25 -

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 51 - Heat transfer coefficient outside of IC tubes wall (level 3)

S

S

2

0

5.750

5.500

5.250

5000

4.750 -

4.500

4.250

4.000

3.750

3.500

3.250 -

-200

PIPER-ONE Test PO-IC-2A

Post-test calculation

3d Nodalizatlon effects

XOX EI2APA-LP-1

YYY IC31P130010000

ZZZ 1C32P130010000

#M IC34P130010000

AA IC35P130010000

I

* ---v- -

a a a a a a a a a a a a - a

0 200 400 600 800 1000

Time (s)

1200

Fig. 52 - Lower plenum pressure

62
160.

E

A

140. .I* 0..- .... .. i.. ... . Z I 140. zz~zI 3d Nodalization effects

MAI

120.

100.

so.

60.

40. ,

20.

0.

-200 0 200 400 600 800

Time (s)

Fig. 53 - IC tubes wall surface temperature (external side level 3)

1000 1200

300.

250.

200.

150.

100.

CL

E

A

50.

0.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 54 - IC tubes fluid temperature (middle elevation)

63
140.

120.

100.

PIPER-ONE Test PO-IC-2A

Post.test calculation

3d Nodalization effects

XXX IC31TEMPF525060000

YYY IC32TEMPF52S060000

ZZZ IC34TEMPF525060000

### IC35TEMPF525060000

M

I

0

S. E

I.-

80.

60.

40.

20.

0. I I g I

-200 0 200

Fig. 55 - IC outlet fluid temperature

400 600 800 1000

Time (s)

1200

x10 4

3.00

2.50

PIPER-ONE Test PO-IC-2A

Post.test calculation

3d Nodalization effects

xxx

YYY

zzz

S1

Q

XU

2.00

1.50

1.00

0.50

0.00

E

IC31 HTHTC515000200

IC32HTHTC51 5000200

IC34HTHTC515000400

IC35HTHTC51 S000200

|

• | • • • •

-0.50 L

-20'0 0 200 400 600 800 1000 1200

Time (s)

Fig. 56 - Heat transfer coefficient at the Inside of IC tubes wall (level 3)

64
x 10

14

4-.

I

I

a

C

4-.

S

0

4

2.25

2.00

1.75

1.50

1.25

1.00

0.75

0.50

0.25

0.00

-0.25

.200

PIPER-ONE Test PO-IC-2A

Post.test calculation

3d Nodalization effects

XXX IC31HTHTC515000201

YYY IC32HTHTC515000201

ZZZ IC34HTHTC515000401

M# IC35HTHTC515000201

0 200 400 600 800 1000 1200

Time (s)

Fig. 57 - Heat transfer coefficient at the outside of IC tubes wall (level 3)

0

S

5.750

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250

-200

- I------- I I U

PIPER-ONE Test PO-IC-2A

Post-test calculation

3e Changes of relevant parameters

D

MX E12APA-LP-1

YVY 1C31P130010000

ZZZ IC33PI30010000

ME# IC36PI30010000

I

A • m I I

0 200 400 600

Time (s)

800 1000 1200

Fig. 58 - Lower plenum pressure

65
160.

140.

120.

100.

80.

60.

S

IE

12

0. * * I I I I p p p •

-200 0 200 400 600 800

Time (s)

Fig. 59 - IC tubes wall surface temperature (external side level 3)

1000 1200

300.

250.

200.

150.

100.

6~

0

a..

Sa0

0.

0

I50.

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 60 - IC tubes fluid temperature (middle elevation)

66
140.

120.

100.

FS

E

A

00.

60.

40.

20.

- * I

* I

* I

* I

PiPER-ONE Test PO-IC2A

Post.test calculation

39 Changes of relevant parameters

XXX IC3iTEMPF525O60000

YYY IC33TEMPF525060000

ZZZ IC36TEMPF525060000.

I

0. i I i

I I I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 61 - IC outlet fluid temperature

xl0 4

3.00

2.50

C

E

2.00 0

1.50 F

PIP

Pos

3-

- I

- I

ER-ONE Test PO-IC-2A

,t.test calculation

Changes of relevant parameters

S I I I I "

XXX 1C31 HTHTC515000200

YYY IC33HTHTC5I 5000200

ZZZ IC36HTHTC5150002000

1.00

0.50 1

0.00 S-.

-0.50 "

-20

i I i i i I 8 i

I 1 6 1 1 1 # I

a0 0 200 400 600 800 1000 1200

Time (s)

FIg. 62 - Heat transfer coefficient at the Inside of IC tubes wall (level 3)

67
Xt0 4

2.25

PIPER-ONE Test PO-IC-2A X 5

XXX IC31HTHTC5150DO201

2.00 Post.test calculation YYY IC33HTHTC515000201

39 Changes of relevant parameters ZZZ IC36HTHTC515000201

1.75 -

E~ 1.50

1.25

1.00

.* 0.75

0.50

0.25

0.00

-0.25 ' ' 2 ' 5 '

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 63 - Heat transfer coefficient at the outside of IC tubes wall (level 3)

4.3.2 Results in Apps. 2 and 4

The results of calculation IC36 are shown in App. 2. It can be noted that the

(arbitrary) variation (i.e. reduction) in the hydraulic diameter value of the pool nodes largely

improves the comparison between measured and predicted wall temperatures (e.g. Figs. 17

and 18 in App. 2) with respect to the reference calculation IC31 (see also data in the last

columns of Tab. XI). The primary' side related quantities are either unaffected (e.g.

downcomer level, Fig. 2 of App. 2), either better predicted (e.g. pressure, Fig. 1 in App. 2).

The results related to the calculation ICA6 are reported in App. 4, just because ICA6

can be considered as a blind post test. Some comments have already been given above.

4.3.3 isolation of downcomer (App. 3)

The isolation of downcomer was assumed to demonstrate that IC flowrate and

exchanged power increase with core supplied power, if the IC constitutes the only path for

the steam coming from the core.

The IC37 calculation has the same input as the IC31 calculation, the only difference

being the closure of the isolation valve between core and downcomer region at 300 s into

the transient. The following effects can be noted:

a) IC flowrate in Ph.W 2 increases after the isolation (Fig. 7 of App. 3);

b)IC flowrate in Ph.W 4 is larger than in Ph.W 2 (Fig. 7 of App. 3);

c) as a consequence of the above, IC exchanged power is also larger (Fig. 28 of App. 3) in

Ph.W 4 with respect to Ph.W 2; this conclusion can also be inferred from the primary

circuit pressure (Fig. 1 of App. 3) that decreases during Ph.W 4;

d) condensing steam is present in the third volume from the top (Fig. 35 of App. 3): this is the

local cause for the increase of the IC exchanged power as also results from observing HTC

in Fig. 33 of App. 3;

e)the pressure peak in Ph.W 3 is better predicted in calculation IC37 than in calculation

IC31. This confirms the conclusion that pressure increase in the test is caused by steam

production without circulation from the downcomer: the consequent stratification effect

is underestimated by the code in the reference calculation.

68
4.4 Scaling analysis

The problem to bc raised in the frame of a scaling study, can be synthesized by the

following questions:

* is the experimental data base rcprescntativc of situations expected in the reference plant

(SBWR in this case)'?

* are the code capabilities and limits (detected in this study) applicable to plant

predictions?

The first question is addressed in the present framework (details in App. 6, ref.

/22/). The second question needs the availability of counterpart tests; some aspects are

discussed in ref. /23/.

A few details, taken from App. 6, arc reported below.

The following parameters are considered in the analysis of scaling efforts:

I) Elevation of IC relative to TAF;

2) Length of IC tubes;

3) Diameter of IC tubes4) Total heat exchange area of IC.

5) Inlct flow area of IC.

Each of the selected parameters is varied in the range from the actual value up to

the right scaled value and for each variation a new nodalization is set up and a calculation

is run. A final calculation is performed including all the variations at the same time.

The results can be summarized as follows:

a) no new phenomena occurred in any of the calculations;

b) the most important parameter in this analysis, i.e. the largest scaling distortions in

PIPER-ONE apparatus, is constituted by the elevation of the IC (parameter nr. 1).

above).

The qualitative scenario in the final calculation (i.e. the one including all the

variations) does not differ from the experimental scenario.

69

5. CONCLUSIONS

The present document reports the analysis performed with Rclap5 in relation to the

PIPER-ONE experiment PO-IC-2. The test is the follow-up of the similar experiment POSD-A and aims at characterizing phenomena connected with the operation of Isolation

Condenser in a geometric configuration typical for SBWR. The test studied was conducted

at high pressure (around 5 MPa) to study code performances in this situation.

Conclusion can be drawn in relation to:

A) overall system performance;

B) thcrmalhydraulic phenomena inside the IC;

C) code capabilities;

D) effect of various changes in the calculation conditions.

It has been confirmed that a constant removed power characterizes the IC

pcrformancc.(itcm A)) whatever arc the primary loop thcrmaihydraulic conditions. From

the analysis of experimental data supported by specific code calculations, the reason why

IC exchanged power remains constant, when core power conditions are varied, has been

made clear. This is a consequence of IC flowratc that is determined by the pressure

difference created in the downcomcr of the main loop; this remains almost constant during

the performed cxpcriment. Constant IC flowratc means constant condensation length in the

IC tubes and constant transferred power to the pool (sec also below).

The shroud put in the pool was not cffcctivc in provoking natural circulation because

of the high conductivity across its wall, that led to fluid temperature stratification with the

same characteristics in the inner and outer zones of the pool.

Heat transfer coefficients are several (3-7) times larger in the condensing zones of the

IC tubes than in the single phase liquid region (item B)); the fluid pool temperature

increase (up to 70 K) has a negligible role in this connection (high pressure steam). Liquid

level in the IC remains almost constant when varying core power.

A new detailed nodalization of PIPER-ONE apparatus was adopted for this study.

The standard version of Rclap5/mod3. I is able to catch the overall phenomenology during

the four main pcriods of the experiment (item C)).

Discrepancies have been identified mainly concerning the IC tubes surface

temperatures, that arc overestimated by the code, particularly on the outer surface: this

means underestimation by the code of the outer heat transfer coefficient, provided that the

overall exchanged power is well predicted. However the possible "fin" effect originated by

thermocouples has not been considered in this conclusion. An unphysically high heat

transfer coefficient is produced in the output by the code although apparently not used

(Tab. IX). During the phenomenological window nr 3 (i.e. during the period of power shutoff) the code was not able to simulate the condensation shock occurring in the IC line.

An extensive series of sensitivity calculations has been carried out (item D)). These

demonstrated:

* some improvements in the code results when passing from the earliest to the latest

Relap5/mod3 code versions; however oscillations in condensation heat transfer value are

much larger in the reference code version. Furthermore the transition logics from heat

transfer mode 2 to 3 (and viccvcrsa) could be improved;

* changes in the equivalent diameter of the pool side of the IC has an important effect on

the calculation of the local quantities like heat transfer coefficient and temperatures;

* changes in nodalization can also have a noticeable effect as far as the calculation of the

above mentioned quantities is concerned. The last item stressed the need to define some

relationship between the (condensation) heat transfer coefficient and the average node

71
dimensions: this seems necessary to get reproducible results especially when

condensation heat transfer is involved.

The performed scaling analysis (sec also App. 6) demonstrated that the scaling

distortions identified in the PIPER-ONE hardware, do not affect, qualitatively, the

phenomena occurring during the selected experiments.

Analyses, related to the same test have been carried out by CATHARE code, e.g.

ref. /24/.

Further activity in this area includes the analysis of a companion experiment during

which nitrogen gas was injected into the primary circuit and actually caused large

degradation of the IC removed power.

72
REFERENCES

/I/ D'Auria F., Modro M., Oriolo F., Tasaka K.: "Relevant Thcrmalhydraulic Aspects of

New Generation LWR's"

CSNl Spec. Meet. On Transient Two-Phase Flow - System Thermaihydraulics, AixEn-Provcncc (F), April 6-8, 1992.

/2/ D'Auria F., Galassi G.M., Oriolo F.: "Thermaihydraulic Phenomena and Code

Requirements for Future Reactors Safety Analysis"

Int. Conf. on Design and Safcty of Nuclear Power Plants (ANP) - Tokyo (J), October

25-29, 1992.

/3/ Andreuccetti P., Barbucci P., Donatini F., D'Auria F., Galassi G.M., Oriolo F.:

"Capabilities of the RELAP5 in Simulating SBWR and AP-600 Thermalhydraulic

Behaviour"

IAEA Technical Committee Meet. (TCM) on Progress in Development and Design

Aspects of Advanced Water Cooled Reactors, Rome (I), September 9-12, 1991.

/4/ Bovalini R., D'Auria F., Mazzini M.: "Experiments of Core Coolability by a Gravity

Driven System Performed in Piper-One Apparatus"

ANS Winter Meeting, San Francisco (CA), November 10-15, 199 1.

/5/ Bovalini R., D'Auria F., Mazzini M., Vigni P.: "Isolation Condenser Performances in

PIPER-ONE Apparatus"

1992 European Two-Phase Flow Group Meet. , Stockholm (S), June 1-3, 1992.

/6/ D'Auria F., Vigni P., Marsili P.: "Application of Relap5/Mod3 to the Evaluation of

Isolation Condenser Performance"

Int. Conf. on Nuclear Engineering (ICONE-2) - San Francisco (US), March 21- 24,

1993

/7/ Bovalini R., D'Auria F., Galassi G.M., Mazzini M.: "Piper-One Research: the

Experiment PO-SD-8 Related to the Evaluation of Isolation Condenser Performance.

Post-Test Analysis Carried out by Relap5/Mod3-7J code"

University of Pisa Report, DCMN - NT 200 (92), Pisa (1), November 1992.

/8/ D'Auria F., Galassi G.M., Mazzini M., Pintorc S.: "Ricerca Piper-One: specifiche

dettagliatc della prova PO-IC-2"

University of Pisa Report, DCMN - NT 234(94), Pisa (I), Giugno 1994.

/9/ Ransom V.H., Wagner R.J., Trapp J.A., Jonhsen G.W., Miller C.S., Kiser D.M.,

Riemkc R.A.: "Relap5/mod2 Code Manual - Vol. 1: Code Structure, Systems and

Solution Methods"

NUREG/CR-4312 EGG 2396 - EGG Idaho Inc., March 1987.

/101 Carlson K.E., Ricmke R.A., Rouhani S.Z., Shumway R.W., Weaver W.L.:

"Rclap5/Mod3 Code Manual - Volume II. User Guide and Input Requirements"

NUREG/CR-5535, June 1990.

73
/ 1I/ D'Auria F., Oriolo F., Bclla L., Cavicchia V.:"AP-600 Thcrmalhydraulic

Phenomenology: A RelapS/mod2 Model Simulation"

Int. Conf. on New Trends in Nuclear System Thcrmohydraulics - Pisa (1), May 30 -

June 2 1994

Int. Top. Meeting on Advanced Reactor Safety - Pittsburgh (PA) April 17-21, 1994

/12/ Barbucci P., Bclla L., D'Auria F., Oriolo F.: "SBWR Thcrmalhydraulic Performance:

a RELAP5/MOD2 Model Simulation"

6th Int. Top. Meet. on Nuclear Reactor Thermaihydraulics, Grenoble (F), Oct. 5-8

1993

/13/ Bovalini R., D'Auria F., Di Marco P., Galassi G.M., Giannccchini S., Mazzini M.,

Mariotti F., Piccinini L., Vigni P.: "PIPER-ONE: a Facility for the Simulation of

SBLOCA in BWRs"

Spec. Meet. on Small Break LOCA Analyses in LWRs, Pisa (1), June 23-27 1985

/14/ Bovalini R., D'Auria F., Mazzini M., Pintorc S., Vigni P.: "PIPER-ONE Research:

Overview of the Experiments Carried out"

9th Conf. of Italian Society of Heat Transport, Pisa (I), June 13-14 1991

/15/ Bovalini R., D'Auria F., Mazzini M., Pintore S., Vigni P.: "PIPER-ONE Research:

Lesson Learned"

9th Conf. of Italian Society of Heat Transport, Pisa (1), June 13-14 1991

/16/ D'Auria F., Fruttuoso G.:" OECD CSNI ISP 21, PIPER-ONE Test PO-SB-7: PostTest Analysis Performed at Pisa University by RELAP5/MOD2 Code"

University of Pisa Report, DCMN - RL 386 (89), Pisa (1), March 1989

OECD CSNI 2nd Workshop on ISP 21, Calci (1), Apr. 13-14 1989

/17/ D'Auria F., Galassi G.M., Mazzini M.: " PIPER-ONE Research: Specifications of

PO-SD-8 Experiment" (in Italian)

University of Pisa Report, DCMN - NT 190 (92), Pisa (1), Jan. 1992

/18/ Ambrosini W., D'Auria F., Galassi G.M., Mazzini M., Virdis M: "Preliminary

Planning of BIP Tests to be Performed in PIPER-ONE Apparatus"

University of Pisa Report, DCMN - NT 207 (93), Pisa (1), May 1993.

/19/ D'Auria F., Mazzini M., Oriolo F., Paci S.: "Comparison Report of the OECD/CSNI

International Standard Problem 21 (PIPER-ONE Experiment PO-SB-7)"

CSNI Report Nr. 162, Paris (F), Nov. 1989

/20/ Bajs T., Bonuccclli M., D'Auria F., Debrecin N., Galassi G.M.: "On Transient

Qualification of LOBI/MOD2, SPES, LSTF, BETHSY and KRSKO Plant

Nodalizations for RELAP5/MOD2 Code"

University of Pisa Report, DCMN - NT 185(9 1), Pisa (1), Dec. 1991

/21/ Brandani M., Rizzo F.L., Gesi E, James A.J.: "SBWR-IC &PCC Systems: an

Approach to Passive Safety"

IAEA Technical Committee Meet. (TCM) on Progress in Development and Design

Aspects of Advanced Water Cooled Reactors, Rome (1), September 9-12, 1991

74
/22/ D'Auria F., Faluomi V.: "Qualitative Analysis of Scaling Effects in Isolation

Condenser Behaviour with RELAP5/MOD3. 1 Thermalhydraulic Code"

ICONE-4 Conference, New Orleans (US), March 10-14, 1996

/23/ D'Auria F., Faluomi V., Vigni P.: "Evaluation of Hardware Data in

Thermalhydraulic Facilities Relevant to SBWR Technology"

2nd European Thermal Sciences and 14th UIT Nat. Heat Transfer Conf., Roma (I),

May 29-31, 1996

/24/ D'Auria F., Mazzini M., Kalli H., Sorjonen J.: "Application of CATHARE Code to

the Isolation Condenser Experiment in PIPER-ONE Loop"

ICONE-4 Conference, New Orleans (US), March 10-14, 1996

/25/ Billa C., D'Auria F., Di Marco P., Mazzini M., Vigni P.: "PIPER-ONE Research:

Facility Description for OECD-CSNI International Standard Problem N. 21 (ISP 21)"

University of Pisa Report, DCMN - RL 246(86), Pisa (1), Sept. 1986

OECD CSNI 1st Workshop on ISP 21, Marina di Grosseto (I), Sept. 22-23 1986

/26/ Cioni L., D'Auria F., Di Marco P., Galassi G.M., Mazzini M.: "PIPER-ONE

Research: Boundary and Initial Conditions for OECD-CSNI International Standard

Problem 21 (ISP 21)"

University of Pisa Report, DCMN - RL 247(86), Pisa (I), Sept. 1986

OECD CSNI I st Workshop on ISP 21, Marina di Grosseto (1), Sept. 22-23 1986

/27/ Billa C., Bovalini R., D'Auria F., Mazzini M., Oriolo F., Piccinini L. "PIPER-ONE

Research: Available Instrumentation and Specifications for OECD- CSNI

International Standard Problem 21 (ISP 21)"

University of Pisa Report, DCMN - RL 255(86), Pisa (1), Sept. 1986

OECD CSNI 1st Workshop on ISP 21, Marina di Grosseto (1), Sept. 22-23 1986

/28/ Breghi M.P.: "Uncertainty Evaluation of the Measurements taken in PIPER-ONE

Apparatus"

University of Pisa Report DCMN RL 382 (89), Pisa (1), 1989

75

APPENDIX 1:

RESULTS OF REFERENCE CALCULATION

(Post-Test IC 31)

7.000

6.000

5.000

4.000

3.000

-~~---

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX 161P30010000oo

YYY E12APA-LP-1

S

a..

*7

PH.W.1

PH.W.2 PH.W.4

2.000 F

1.000 PH.W.5

m S S S S S I

0.000 I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 1 - Measured and calculated trends of lower plenum pressure

E

9

320.

300.

280.

260.

240.

220.

200.

180.

160.

140.

120. L-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 2 - Measured and calculated trends of lower plenum temperature

A[-I
5.

0

a

0

I.-

350.

325.

300.

275.

250.

225.

200.

175.

150.

125.

100.

. f

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31 HTTEMP2001 00810

YYY 1C31 HTTEMP2001009IO.

ZZZ 1C31HTTEMP200101010

W# E12ATC-31 -9

a 11 II 11

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 3 - Measured and calculated trends of rod surface temperature (level 9)

E

13.000

12.500

12.000

11.500

11.000

10.500

10.000

9.500

9.000

8.500 L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 4 - Measured and calculated trends of core level

AI-2
E

14.000

13.000

12.000

11.000

10.000

9.000

8.000

-200 0 200 400 600 8

Time (s)

Fig. 5 - Measured and calculated trends of downcomer level

00 1000 1200

IF

120.

100.

80.

60.

40.

20.

0.

1 4 1 I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

MX IC31CNTRLVAR40

YYY E12AWH-POWER

-20. L

-20

m I a

)0 0 200 400 600

Time (s)

800 1000 1200

Fig. 6 - Measured and calculated trends of core power

AW-3
0

Lu

I0.400

0.350

0.300

0.250

0.200

0.150

0.100

0.050

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

,I I1 Ll , , , .

XXX IC31MFLOWJS5000000

YYY 1C31MFL0WJ5O500000q

ZZZ E12AWW-IC-1

J*

0.000 I- LX-.

-0.050 '

-2010 0 200 400 600 800 1000 1200

Time (s)

Fig. 7 - Measured and calculated trends of IC mass flow rate

C

18.0

16.0

14.0

12.0

10.0

8.0

6.0

4.0

2.0

0.0

-2.0 '-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 8 - Measured and calculated trends of IC differential pressure

AI-4
350. . S S S * S S S 5 5 * * S

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX 1031TEMPF500100000

YYY E12ATF-IC-O

300. V

250. -

o 200.

S 150.

100. 1-

So. 1-

S S S S S

'S I I U.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 9 - Measured and calculated trends of IC inlet fluid temperature

300.

* PIPER-ONE Test PO-IC-2A

Post-test calcUlation

RELAPS/Mod3.1

XXX IC31TEMPF515030000

YYY E12ATF-IC-1

ZZZ E12ATF-IC-2

250. F

200. I-

*i 150.

E

A

100. I"

so. i"

0.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 10. Measured and calculated trends of IC tubes fluid temperature

(middle elevation)

AI-5
0

'U

0.

2

'UI350.

300.

250.

200.

150.

100.

50.

I I

* I

* I

a I I I I

PIPER-ONE Test PO-IC-2A

Post.test calculation

RELAP5/Mod3.1

I I

XXX IC31TEMPFSISOIOOOO

YYY 1C31TEMPFI51520000

ZUZ 1C31TEMPF515030000

##S IC31TEMPF515040000

AM IC31TEMPF515050000

| I • I • •

0.

-20

XXX IC31TEMPFS40010000

10 0 200 400 600 Boo

Time (s)

1000 1200 1400

Fig. 11 - Calculated trends of IC fluid temperature along the axis

110.0

100.0

90.0

PIPER-ONE Test PO.IC-2A

Post.test calculation

RELAP51Mod3.1

80.0 F

E.

1!

70.0 j

60.0

50.0

40.0

30.0

20.0

YYY E12ATF-IC-5

10.0 ,

-20

2 1 t I I

I0 0 200 400 600

Time (a)

800 1000 1200 1400

Fig. 12 - Measured and calculated trends of IC outlet fluid temperature

AI-6
300. !

I

I

I

I

i 250.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31 HTTEMP515000101

YYY E12ATS-IC-2

E

A

200.

150.

100.

r

s0.

l1u

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 13 - Measured and calculated trends of IC tubes wall surface temperature

(internal side top elevation)

300.

250.

200.

150.

100.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5IMod3.1

XXX IC31HTTEMP515000101

YYY IC31HTTEMP5150002Or'

ZZZ IC31HTTEMPS15000301

WU 1C31 HTTEMPS150004O1-

MAA IC31HTTEMPS15000501

E

A

50.

0. 1

.2(

I I

0 0 200 400 600 800 1000 1200

Time (s)

Fig. 14 - Calculated trends of IC tubes wall surface temperature along the axis

(internal side)

AI-7
160.

140.

120.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSfMod3.1

)=( MC3HTTEMM55000I 10.

YYY E12ATS-IC-1

I.I100. F

80. 1-

60. 1-

40. F

20. F

• I I . I I I a I I a I 2

0.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 15 - Measured and calculated trends of IC tubes wall surface temperature

(external side top elevation)

160.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

S * I * S S

IXX 1C31HTTEMP515000210.

YYY EI2ATS-IC-3

140. 1

120. I

5• 100.

! 80.

Io.

40.

20.

0. I m m m m m m I I m m I I I I I I I a a a

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 16 - Measured and calculated trends of IC tubes wall surface temperature

(external side level 3)

A1-8
140.

E

A

LLL tIZFP I •-IL,5I 120. RELAPS/Mod3.1 &." EI2ATS-IC-g

100.

80.

60.

40.

20.

0. * I p p p I I p p 3 I

-200 0 200 400 600 800 1000

Time (s)

Fig. 17 - Measured and calculated trends of IC tubes wall surface temperature

(external side middle elevation)

1200

IE

A

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0 L-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 18 - Measured and calculated trends of IC tubes wall surface temperature

(external side bottom elevation)

AI-9
120.

100.

80.

60.

40.

PIPER-ONE Test PO-lC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TEMPF561OIOOOO

YYY IC31TEMPF562010000

ZZZ E12ATF-SC-1

0

IIU I

20. F0. '-

-200

I I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 19 - Measured and calculated trends of IC internal pool fluid temperature

(top level)

100.0

90.0

80.0

70.0

60.0

50.0

40.0

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TEMPF560110000

YYY IC31TEMPF560120000

ZZZ EI2ATF-SC-2

&

CLE

CI.-

30.0 1-

20.0 F

B

II i

10.0

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 20 - Measured and calculated trends of IC Internal pool fluid temperature

(level 2)

Al-10
24.000

23.000 .... - .M,&UZZZ . E12ATF-SC-8 RELAP5IMod3.1 # EI2ATF-SC-9

22.000

6 21.000

E 20.000

0.

E

g-19.000

18.000

17.000

16.000

-200 0 200 400 600 800 1000

Time (s)

Fig. 21 - Measured and calculated trends of IC Internal pool fluid temperature

(middle level)

1200

E

A

22.000

21.000

20.000

19.000

18.000

17.000

a I 9 I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TEMPF551010000

YYY IC31TEMPF552010000

ZZZ EI2ATF-SC-6

xv _41Y__" _Wý .

16.000 L._

-200

aL A I a I a I- I I I a I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 22 - Measured and calculated trends of IC Internal pool fluid temperature

(bottom level)

Al-II
6

I110.0 1. I I .a a I .a 9

PIPER-ONE Test PO-IC-2A XOXX IC31TEMPF66101

100.0 Post-test calculation YYY IC31TEMPF56201

RELAPS/Mod3.1 ZZZ EI2ATF-SC-10

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0 a a I I I I a I a a a

-200 0 200 400 600 800 1000

Time (s)

Fig. 23 - Measured and calculated trends of IC external pool fluid temperature

(top level)

1200

0

'U

0

0.

2

0

I65.0

60.0

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0 -

-2V00 0 200 400 600 800 1000

Time (s)

Fig. 24 - Measured and calculated trends of IC external pool fluid temperature

(level 11)

1200

Al-12
E

A

34.0

32.0

30.0

28.0

26.0

24.0

22.0

20.0

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TEMPF660070000

YYY IC31TEMPF660080000

ZZZ Et2ATF-SC-12

18.0

16.0

-200

I I I S S I I I S I p p p

0 200 400 600 800 1000 1200

Time (s)

Fig. 25 - Measured and calculated trends of IC external pool fluid temperature

(middle level)

I

I-I.

22.500

22.000

21.500

21.000

20.500

20.000

19.500

19.000

18.500

18.000

17 fnil

I g I 

PiPER-ONE Test PO-IC-2A XXX IC31TEMPF55100

Post-test calculation YYY IC31TEMPF65200

RELAPSMod3.1 ZZZ EI2ATF-SC-14

I -

10000

10000

I I I5 I III

. * 1 1 . a

91 1 9 I 1 1 - - • • I

• • •vvv.;200 0 200 400 600 800 1000

Time (s)

Fig. 26 - Measured and calculated trends of IC external pool fluid temperature

(bottom level)

1200

AI-13
400.

350.

300.

250.

200.

150.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TEMPG500080000-

YYY E12ATF-IC-0

ZZZ E12ATSAT

C.

4

100.

50. -

| m

n . a

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 27 - Measured and calculated trends of steam temperature at IC Inlet

compared with experimental saturated temperature

1000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX 1031 CNTRLVAR62

YYY E12AICPOWER

800 -

600 1-

i

03.

400 F

200

0 F

-200.20

I I I I

O0 0 200 400 600 800 1000 1200

Time (s)

Fig. 28 - Measured and calculated trends of IC exchanged power

AI-14
140.

120.

100.

80.

60.

40.

E

A

20.

0.

-20.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 29 - Measured and calculated trends of temperature difference between

internal and external side of IC tubes wall (top elevation)

180.

160. F

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31CALC

YYY E12EXP

E

A

140.

120.

100.

80.

60.

40.

20.

0.

-20. '

-2C

I D

a

1)0 0 200 400 600 800 1000 1200

Time (s)

Fig. 30 - Measured and calculated trends of temperature difference between

IC fluid and external side of IC tubes wall (middle elevation)

AI-15
250.

200.

150.

100.

50.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC31CAL.C

YYY E12AEXP

0

0

0

I0.

-50.

-200

I I UI I I a 2 2 a 2 1

0 200 400 600 800 1000 1200

Time (s)

Fig. 31 - Measured and calculated trends of temperature difference between

Internal side of IC tubes wall and IC pool fluid temperature (top elevation)

4 x 10 3.50

3.00

2.50

_ 2.00

1.50

* 1.00

2 0.50

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC3IHTHTC515000100

YYY IC3IHTHTC515000101

I0.00

-0.50 L

-20

I

2

0 0 200 400 600 800 1000 1200

Time (s)

Fig. 32- Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (top elevation)

Al-16
x10 4

1.20

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31HTHTC515000300

YYY IC31HTHTC515000301

C

C

C

U

I..

S

C

1.00

0.80

0.60

0.40

0.20

0.00

-0.20

-200 0 200 400 600 800 1000

Time (s)

Fig. 33 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (middle elevation)

1200

2500

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31 HTHTC515000500

YYY IC31 HTHTC515000501

2000 F

C,'

4-C

C

.2

C

8k. S

C

C

60

4-

4-I0

0

1500 F

1000 I

500

0

I a I I I -500

0 0 200 400 600 800 1000 1200

Time (s)

Fig. 34 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (bottom elevation)

AI-17
C

a

0

S

U

S

1.400

1.200

1.000

0.800

0.600

0.400

0.200

0.000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5IMod3.1

XXX IC31VOIDG515010000

YYY IC31VOIDG515020000

ZZZ IC31VOIDG515030000

### IC31VOIDG515040000

AAA IC31VOIDG515050000

S I a I Ia I I

-2!00 0 200 400 600 800

Time (s)

Fig. 35 - Calculated trends of IC tubes void fraction along the axis

1000 1200

1.200

1.000

0.800

0.600

0.400

0.200

0.000

-0.200

.AftU An

I I I I I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31VELF515010000

YYY IC31VELF515020000

ZZZ IC31VELF515030000

## IC31VELF515040000

MA IC31VELF515050000

I I I I I S I S I I I I I

-2!00 0 200 400 600 800

Time (s)

Fig. 36 - Calculated trends of IC tubes liquid velocity along the axis

1000 1200

AI-18
4.000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5IMod3.1

xJxx

yyy

zzz

gsa

MA

IC31VELG515010O00

IC31VELG515020000

IC31 VELG515030000

IC31VELG515040000

IC31VELG515050000

3.000

2.000

1.000

0.000

-1.000

-2.000

-200

p 3 I I I I I I I p p p j

0 200 400 600 800 1000 1200

Time (s)

Fig. 37 - Calculated trends of IC tubes steam velocity along the axis

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

I:E

CI12

10

8.

XY•

zz

AA II

I

j

XIC31HTMODES15000100

YIC31HTMODE515000200

ZI131 HTMODE51 500030Q

IIC31HTMODE515000400

AIO31HTMODE51 o4q

4

2 A 01 w R 1A * I 74A 7 1 A

I m a

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 38 - Calculated trends of IC tubes heat transfer mode (Internal side)

Al-19
3

E

IPi

fPC

RI

1 6 1 I

PER-ONE Test PO-IC-2A

ost-test calculation

ELAPS/Mod3.1

r XYZ Y XYZ

xxx

vyY

zzz

M.

MA

I -------- I I

IC31HTMODE51500010,

IC31HTMODE515000201

IC31HTMODE515000301

1C31HTMOOE515000401

IC31HTMODE515000501

Y XYVZ

2

J i a n I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 39 - Calculated trends of IC tubes heat transfer mode (external side)

350.

300.

250.

200.

150.

100.

6'

0

'a

0

a.

E

0

IPIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31TG-TFSISOI

YYY IC31TG-TFS1502

ZZZ IC31TG-TF51503

### 1C3ITG-TF51504

MA IC31TG-TFSISOS

50.

0.

-50. • m " • II

-200 0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 40 - Calculated trends of subcooling degree inside IC tubes

AI-20
4b

a

2.00

1.50

1.00

0.50

0.00

-0.50

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC31CPUTIMEO

• e I I • i • 1

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 41 - CPU versus transient time

a

0. 0

E

t.

0.140

0.120

0.100

0.080

0.060

0.040

0.020

0.000

-0.020 L-

-200 0 200 400 600 800 1000 1200 1400

Time (a)

Fig. 42 - Time step versus transient time

A[-21
a.

.3

S

0

0.140

0.120

0.100

0.080

0.060

0.040

0.020

0.000

.nnnn -

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX( IC31 OTO

YYY IC3iDTMAX

-2200 0 200 400 600 800 1000 120

Time (s)

Fig. 43 - Time stop and specified maximum time step versus transient time

0 1400

A1-22
APPENDIX 2:

IC 36 Results

a

U

a

5.750

5.500

5.250

5.000

4.750

4.500

4.250

4.000

3.750

3.500

3.250

-200

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

Xocx IC36PI30010000

YYY E12APA-LP-1

I t I I I I I I I I I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 1 - Measured and predicted trends of lower plenum pressure

06

0.

I.-

320.

300.

280.

260.

240.

220.

200.

180.

160.

140.

1 -nL

-4200 0 200 400 600 800

Time (s)

Fig. 2 - Measured and calculated trends of lower plenum temperature

1000 1200

A2-1
350.

325.

300.

275.

250.

225.

200.

I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

)=c IC36H4TTEMP200100810

YYY IC36HTTEMP20010091O.

ZZZ IC36H4TTEMP200101010

*" E12ATC-31-9

E~

02

I I I I I a I a I

175.

150.

125.

100.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 3 - Measured and calculated trends of rod surface temperature (level 9)

13.000

12.500

12.000

• 11.500

i 11.000

10.500

10.000

9.500

9.000

8.500 L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 4 - Measured and calculated trends of core level

A2-2
14.000

13.000

- 12.000

11.000

10.000

9.000

8.000 t

-200 0 200 400 600 8

Time (s)

Fig. 5 - Measured and calculated trends of downcomer level

00 1000 1200

IFbe

120.

100.

80.

60.

40.

20.

0.

-20. L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 6 - Measured and calculated trends of core power

A2-3
0.400 * V

0.350 1-

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

0.300

0

.2

0.250 1-

XX C36MfLOWJWSOOOOO

YYY IC36MFLOWJ5O5000000

ZZZ E12AWW-IC-1

0.200 F

0.150 F

0.100 F

0.050 -

jJ.~N~n#lIIuIFrtIiIPIIuI1 J~U I "Ti'

0.000 F

-0.050

-2C

. S S S S S S S S S S

00 0 200 400 600 800 1000 1200

Time (s)

Fig. 7 - Measured and calculated trends of IC mass flow rate

0.

S

0

_.

C

60.0

50.0

40.0

30.0

20.0

10.0

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC36P52509-P50008

YYY EI2APD-IC-2D

CALCULATED VALUE DOES NOT

CORRESPOND TO EXPERIMENTAL

TAP POSITION

JL - W 17--

0.0

-10.0

.20

A A m I m m m m a I

00 0 200 400 600 800 1000 1200

Time (s)

Fig. 8 - Measured and calculated trends of IC differential pressure

A2-4
350.

300.

250.

200.

150.

U I I 5

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

,O(X IC36TEMPF50omoooo

YYY EI2ATF-IC-0

I

I.

100.

50.

0.

-200

i m i a I I

0 200 400 600 Soo 1000 1200

Time (s)

Fig. 9 - Measured and calculated trends of IC Inlet fluid temperature

300.

250.

200.

150.

100.

* I

I I 1 I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS!Mod3.1

XXX IC36TEMPF515030000

YYY E12ATF-IC-1

ZZZ E12ATF-IC-2

II50.

I1 m m m m 0

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 10 - Measured and calculated trends of IC tubes fluid temperature

(middle elevation)

A2-5
400.

350.

300.

250.

200.

150.

I -

I I m i

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

Yyyy

AM

9 1 I

IC3GTBMPF1501OIOOO

IC36TEMPFS15020000

IC36TEMPF515030000

IC36TEMPF51504000W

IC36TEMPF515050000

0

Ia

100.

20.

0.

-200

I I I I ~ I I I * I I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 11 - Calculated trends of IC tubes fluid temperature along the axis

120.

100.

80.

IS:

PIPER-ONE Test

Post-test calculat

RELAPS/Mod3.1

* I

* I

PO-tC-2A

Ion

I I 1 5 1 9 9 1 I

XXX IC36TEMPF525040000

YYY IC36TEMPF525050000

ZZZ IC36TEMPF525060000

### E12ATF-IC-5

60.1

40.

20.

CALCULATED VALUE NOT

CONSISTENT WITH THERMOCOUPLE

POSITION

I I I I I I I

0.

-20•0 0 200 400 600 800 1000 1200

Time (s)

Fig. 12 - Measured and calculated trends of IC outlet fluid temperature

A2-6
300.

250.

200.

150.

100.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5IMod3.1

41 1 V

XXX IC36HTrTEMPSISOOOIOI

YYY E12ATS-IC-2

0

I.-I

50.

0 . I I I I I I I U I I

-200 0 200 400 600 goo 1000

Time (s)

Fig. 13 - Measured and calculated trends of IC tubes wall surface temperature

(internal side top elevation)

1200

300.

250.

200.

150.

100.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXU 1036HTTEMP515000I10

YYY IC36HTTEMP5150002Or'

ZZZ IC36HTTEMP51 5000301

### IC36HTTEMP515000401-

MAA 1036HTTEMP515000501

E

A

50. 

-

0. .200

1 I I aI I I

0 200 400 600

Time (s)

800 1000 1200

Fig. 14 -Calculated trends of IC tubes wall surface temperature along the axis

(internal side)

A2-7
160.

140.

120.

100.

80.

60.

CS

I.

40.

20.

O.

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 15 - Measured and calculated trends of IC tubes wall surface temperature

(external side top elevation)

5.

S

0

S

0.

2

S

I160.

140.

120.

100.

80.

60.

40.

20.

0. 1-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 16 - Measured and calculated trends of IC tubes wall surface temperature

(external side level 3)

A2-8
120.

100.

U

I

I-I.

60.

40.

20.

0. | | I I I | U U I I I

-200 0 200 400 600 800 1000

Time (s)

Fig. 17 - Measured and calculated trends of IC tubes wall surface temperature

(external side middle elevation)

1200

U

S

0

C. ES

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0 L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 18 - Measured and calculated trends of IC tubes wall surface temperature

(external side bottom elevation)

A2-9
120.

100.

I 4 I II

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXXx IC36TEMPFSSIOIOOOO

YYY IC36TEMPFS62OIO000

ZZZ E12ATF-SC-1

80. I6'

6I I.-

60.

40.

II,,

20.

I | •

0. _ -20

I m a t

a0 0 200 400 600 800 1000 1200

Time (s)

Fig. 19 - Measured and calculated trends of IC internal pool fluid temperature

(top level)

100.0

90.0

80.0

70.0

p il - - i • Pi- I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSIMod3.1

XiO(X IC36TEMPF5601 10000

YYY IC36TEMPF56012000O

ZZZ E12ATF-SC-2

60.0

Co

0. 50.0

40.0

30.0

20.0

I

|

10.0 .

O0 0 200 400 600 800 1000 1200

Time (s)

Fig. 20 - Measured and calculated trends of IC internal pool fluid temperature

(level 2)

A2- 0
23.000

22.000

21.000

20.000

19.000

I I I a I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX 1036TEMPF560070000

YYY EI2ATF-SC-4

ZZZ E12ATF-SC-8

W E12ATF-SC-9

S

I

I

18.000

17.000

16.000 --

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 21 - Measured and calculated trends of IC internal pool fluid temperature

(middle level)

21.500

21.000

5 1 B I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

)O(X IC36TEMPF551010O00

YYY IC36TEMPF552010000.

ZZZ E12ATF-SG4

20.500 F

20.000

19.500

E 19.000

E 18.500

18.000

17.500

17.000

16.500

-200

X*

II I . . I ....

I

0 200 400 600 800 1000 1200

Time (s)

Fig. 22 - Measured and calculated trends of IC Internal pool fluid temperature

(bottom level)

A2-11
110.0

100.0

90.0

80.0

PIPER-ONE Test PO-IC.2A

Post-test calculation

RELAPS/Mod3.1

WX IC38TEMPF861010ooo

YYY IC36TEMPF562010000.

ZZZ E12ATF-SC-1 0

a 70.0

60.0

50.0

40.0

30.0

20.0

10.0 II i

I

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 23 - Measured and calculated trends of IC external pool fluid temperature

(top level)

65.0

60.0

55.0

50.0

4S.0

40.0

35.0

T

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP51Mod3.1

'Ccx

YYY

1036TEMPF660090000

IC36TEMPF$68OIOOOO

IC36TEMPF660110000

EI2ATF-SC-1 I

8~

0

6

I-a

E

0

I30.0

25.0

20.0

15.0

-200

m m

0 200 400 600 800 1000 1200

Time (s)

Fig. 24 - Measured and calculated trends of IC external pool fluid temperature

(level 11)

A2-12
34.0

32.0

30.0

28.0

26.0

24.0

22.0

PIPER-ONE Test PO-C-2A

Post-test calculation

RELAPS/Mod3.1

XXXY)Y IC=8TTEMMPFO680W0700000W

ZZZ E12ATF-SC-12

I20.0

18.0

.1r n • v.w -2200 0 200 400 600 800 1000

Time (s)

Fig. 25 - Measured and calculated trends of IC external pool fluid temperature

(middle level)

1200

E

1!

22.500

22.000

21.500

21.000

20.500

20.000

19.500

19.000

18.500

16.000

I7qlf -n

, PIPER-ONE Test POIC-2A XXX IC3S6TEMPF551010000

Post-test calculation YYY IC3STEMPF6520O0000

RELAPS/Mod3.1 ZZZ EI2ATF-SC-14

"AAA

xy

B i i i i i I I

el••VV-2100 0 200 400 600 800 1000

Time (a)

Fig. 26 - Measured end calculated trends of iC external pool fluid temperature

(bottom level)

1200

A2-13
400.

350.

300.

..... J

* T

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC36TEMPG5000SOOQO

YYY E12ATF-IC-0

ZZZ E12ATSAT

S

S

I-I. 3.-

250.

200.

150.

100.

50.

2i | ft a

-200 0 200 400 600

Time (s)

Boo 1000 1200

Fig. 27 - Measured and calculated trends of steam temperature at IC Inlet

compared with experimental saturated temperature

I.

h.

S

0

0.

1000

800

600

400

200

0

-200 L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 28 - Measured and calculated trends of IC exchanged power

A2-14
5.

I.-

140.

120.

100.

80.

60.

40.

20.

0.

-20.

PIPER-ONE Test PO-1-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC36CAL.C

fYY E12EXP

- I

- I

|

i5 I I i 6

-200 0 200 400

Time (s)

600 800 1000 1200

Fig. 29 - Measured and calculated trends of temperature difference between

internal and external side of IC tubes wall (top elevation)

U

0.

E

A

180.

160.

140.

120.

100.

80.

60.

40.

20.

0.

II 6 1 a I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

WX 1036CALC

YYY E12EXP

I

4l. X

m m a i

-20. .

-20'0 0 200 400 600 800 1000 1200

Time (s)

Fig. 30 - Measured and calculated trends of temperature difference between

IC fluid and external side of IC tubes wall (middle elevation)

A2-15
250.

200.

150.

100.

mnI

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSIMod3.1

XXX IC36CALC

YYY E12AEXP

0

I.

0

0.

-50.

-200

m i m m 0 n m

0 200 400 600 800 1000 1200

Time (s)

Fig. 31 - Measured and calculated trends of temperature difference between

internal side of IC tubes wall and IC pool fluid temperature (top elevation)

X10 4

3.00

2.50

2

3.

I

I

2.00

1.50

- '

- I

- I

- I

- I

- I

- I

- I

I 1 I 1

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

1 4 4 6 a • e

XXX IC36HTHTC5I5000100

YYY IC36HTHTC5500010I

1.00

0.50

0.00

-0.50_2(00 0 200 400 600 800 1000 1200

Time (s)

Fig. 32 Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (top elevation)

A2-16
xlO 4

1.80

4-

CD

8

a-.

C

1.60

1.40

1.20

1.00

0.80

0.60

0.40

0.20

0.00

f

PIPER-ONE Test P0-IC

Post-test calculation

RELAPSMod3.1

-2A xxIc36HTHTrCSl5OO0300

YYY 1036HTHTC51 5000301

x1j" -X-

-0.20 '

-20'0 0 200 400 600 800 1000 1200

Time (s)

Fig. 33 - Calculated trends of the heat transfer coefficient at the inside

and the outside of IC tubes wall (middle elevation)

3500

3000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC36HTHTC515000500

YYY IC36HTHTC515000501

£

4..

I

.2

0

8

0

SI

C

U

S

z

2500 F

2000

1500 F

1000

500

0

I I I I I I I I I I I I

-500 .

.20i0 0 200 400 600 800 1000 1200

Time (s)

Fig. 34 -Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (bottom elevation)

A2-17
1.400

PIPER-ONE Test PO-IC-2A XXX IM

YYY lc:-

1.200 zzz $C

RELAPS/Mod3.1 M# Ic:

AAA ICZ

1.000

0.800

0 .600

0 0.400

0.200

0.000 _#A..... Z

-0.200 , , , , I , ,

-200 0 200 400 600 800

Time (s)

Fig. 35 - Calculated trends of IC tubes void fraction along the axis

3SVOIDG515010000

36VOIDG515020000

36VOIDG515030000

36VOIDG515040000 36VOIDG515050000

I I I

1000 1200

1.600

1.400

1.200

1.000

0.800

0.600

M I I I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

xxx

WYY

zzz

MA

C I I

1C36VELF515010000

IC36VELF515020000

IC36VELF515030000

IC36VELF515040000 IC36VELF51 505O000

.2_o

01

0.400

0.200

0.000

-0.200

-200

a I

0 200 400 600 800 1000 1200

Time (s)

Fig. 36 - Calculated trends of IC tubes liquid velocity along the axis

A2-18
1.500

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

MX

WYY

zzz

M'

AM

IC36VELGSISO10000

1036VELG5 15020000

IC36VELG3515030000

IC36VELG5 15040000

IC36VELGSISMSOOO 1.000 F

B,

0.500

0.000

-0.500

I

~~li - ~ ie h *I.h d

"IJ

-1.000

I

-1.500 1 -200 0 200 400 600 800 1000 1200

Time (s)

Fig. 37 - Calculated trends of IC tubes steam velocity along the axis

0

E

c

12

10

8

6

4

I ~

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSIMod3.1

XX(X IC36HTMODES15000100

YYY IC36HTMODE515000206

ZZZ IC-36HTMODE515000300-

### IC36HTMODES15000400 MA Ir6HTMODES1 5T0

2

I I | II • • II •

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 38 - Calculated trends of IC tubes heat transfer mode (internal side)

A2-19
3

I

T

PIPER-ONE Test PO-ZC-2A

Post-test calculation

RELAPS/Mod3.1

XY Xr

. S * S

,OcX IC36ITMODESS15000%

YYY IC36HTMODES15=0001

ZZZ IC36HTMODE5150003O1

MU IC36HTMODE515000401

AAA IC36HTMODE51500050f

xy II

2 i e E,. TWl

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 39 - Calculated trends of IC tubes heat transfer mode (external side)

A2-20
APPENDIX 3:

IC 37 Results

6.750 .. .1 1 5 1 5 1B.

PIPER-ONE Test PO-IC-2A XXX IC37PISOO0OOOO

5.500 Post-test calculation YYY EI2APA-1

RELAP5/Mod3.1

5.250

5.000

4.750

4.500

- 4.250

4.000

3.750

3.500

3.250 , , , , U , , I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 1 - Measured and predicted trends of lower plenum pressure

320.

PIPER-ONE Test PO-IC-2A xxx IC37TEMPF130010000

300. Post-test calculation YYY EI2ATF-LP-1

RELAP5/Mod3.1

280.

260.

- 240.

, 220.

200.

180.

160.

140.

120.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 2 - Measured and calculated trends of lower plenum temperature

A3-M
350.

325.

300.

f

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

ob cx C7HTmP20oiooi

YYY IC37IIITEMP2001009IO.

ZZZ IC37HTTEMP200101010

#ff E12ATC-31 -9

275. F

I 250.

225.

200. I

175.

150.

125.

100.-20'0 0 200 400 600 800 1000 1200

Time (s)

Fig. 3 - Measured and calculated trends of rod surface temperature (level 9)

14.000

13.000

12.000

11.000 I

10.000

9.000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC37CNTRLVARt2O

WYY Et2ALP-CC-1

I-. k

i"

8.000

7.000

m m m il I Q i l

6.000 1 .2(00 0 200 400 600 800 1000 1200

Time (a)

Fig. 4- Measured and calculated trends of core level

A3-2
14.000

i

£

a.

S

a

13.000 h *,, .,

12.000

11.000

10.000

9.000

8.000

-200 0 200 400 600 8

Time (s)

Fig. 5 - Measured and calculated trends of downcomer level

00 1000 1200

120.

100.

80.

'R

60.

40.

20.

0.

-20. L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 6 - Measured and calculated trends of care power

A3-3
39

0.080

0.070

0.060

0.050

0.040

0.030

0.020

0.010 -

0.000 - ,,- -----

-0.010,

-200 0 200 400 600 8

Time (s)

Fig. 7 - Measured and calculated trends of IC mass flow rate

00 1000 1200

A

C

0.

h.

o0.

S

5

35.0

30.0

25.0

20.0

15.0

10.0

5.0

0.0

-5.0 L-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 8 - Measured and calculated trends of IC differential pressure

A3-4
350.

300.

250. F

E

a.

200.

150.

100.

50.

T:==

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

r . ""

-~ ', x y ~

K-

)OCX IC37TEMPFSOOIOOOOO

YYY E12ATF-IC-0

nL I m m m A m m I I I I I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 9 - Measured and calculated trends of IC Inlet fluid temperature

I.

350.

300.

250.

200.

150.

100.

50.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP51Mod3.1

WX IC37TEMPF515030000

YYY E12ATF-IC-1

ZZZ E12ATF-IC-2

0. -

-20

m m 6 2

)0 0 200 400 600 800 1000 1200

Time (s)

Fig. 10 - Measured and calculated trends of IC tubes fluid temperature

(middle elevation)

A3-5
350. I I I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

4 9 4I

XXX

zzz

AM

IC37TEMPF515010000

IC37TEMPF515020000

IC37TEMPF515030000-

IC37TEMPF51 5040000

IC37TEMPF515050000

300.

250.

* 200.

'150.

100.

50. 1-

0• . - a a a a J - -- I I I - -. I

02, .200 0 200 400 600 800 1000

Time (s)

1200

Fig. 11 - Calculated trends of IC tubes fluid temperature along the axis

ISO.

160.

140.

120.

100.

80.

60.

0

I.I40.

20.

0.

-200 0 200 400 600 800 1000 1200

Time (a)

Fig. 12 - Measured and calculated trends of IC outlet fluid temperature

A3-6
300.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC37H4TTEMP51W00IOI

YYY Et2ATS-tC-2

250. I

200. 1-

I-I.

150.

100.

50.

0. J U U I I ' ' ' '

-200 0 200 400 600 800 1000

Time (s)

Fig. 13 - Measured and calculated trends of IC tubes wall surface temperature

(internal side top elevation)

1200

300. I a a a

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

I m l i

250.

a I

IC37HTTEMP515000IOI

IC37HTTEMP5I 5000201'

IC37HTTEMP515000301

IC37HTTEMP51500040I*

IC37HTTEMP515000501

CL.

E

a

200.

150.

100.

50. F

A . i I i i 0 2 I

.200 0 200 400 600 800 1000 1200

Time (s)

Fig. 14 - Calculated trends of IC tubes wall surface temperature along the axis

(internal side)

A3-7
6'

i

2

160.

140.

120.

100.

80.

60.

40.

20.

0.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXCX IC37HTTEMP$1500011M~

YYY E12ATS-10-1

I S U I U U I U U I I I S

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 15 - Measured and calculated trends of IC tubes wall surface temperature

(external side top elevation)

160.

140.

120.

100.

80.

60.

6'

S

S

S

i

I40.

20.

0. "

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 16 - Measured and calculated trends of IC tubes wall surface temperature

(external side level 3)

A3-8
160.

140.

120.

100.

80.

60.

10

E

0

20.

O.

-200 0 200 400 600 800 1000

Time (s)

Fig. 17 - Measured and calculated trends of IC tubes wall surface temperature

(external side middle elevation)

1200

E

A

120.

100.

80.

60.

40.

20.

7 I D I 1

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC37HTTEMP515000510

YYY E12ATS-IC-7

0. 1

-2D

pf p a I a 5 1 a 9 p 1 0 1

}0 0 200 400 600 800 1000 1200

Time (s)

Fig. 18 - Measured and calculated trends of IC tubes wall surface temperature

(external side bottom elevation)

A3-9
120.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

)=~ IC37TEMPF5S1010000

YYY IC37TEMPFS$2OI 0000

ZZZ E12ATF-SC-1

100. F

G

80.

60.

40.

20.

0. 1 1 * I a a

-200 0 200 400 600 800 1000

Time (s)

Fig. 19 - Measured and calculated trends of IC Internal pool fluid temperature

(top level)

1200

100.0

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSMod3.1

XXX IC37TEMPF560110000

YYY IC37TEMPF560120000

90.0 ZZZ EI2ATF-SC-2 rS

S

I-I.

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0 ,

-20

2 a - a I a 2 1 a 2 a 0 U

10 0 200 400 600 800 1000 1200

Time (a)

Fig. 20 -Measured and calculated trends of IC Internal pool fluid temperature

(level 2)

A3-10
25.000

PIPER-ONE Test PO-C-2A I -- A A--- . ... .

XXX IC37TEMPF560070000

WVy =ArVt1-.

24.000 - rosi6 calculation ZZZ EI2ATF-SC-8

RELAPS/Mod3.1 m EI2ATF-SC-9

23.000

22.000

21.000

S20.000 E

19.000

18.000

17.000

16.000

-200 0 200 400 600 800 1000

Time (s)

Fig. 21 - Measured and calculated trends of IC Internal pool fluid temperature

(middle level)

1200

23.000

22.000

21.000

S20.000

E 19.000

18.000

I S S S

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXIC37TEMPF551010000

YIYY IC37TEMPF55201 0000

ZZZ E12ATF-SC-6

Xv --X*-,O,

17.000 I

. . K C I I I I I

16.000

-20l0 0 200 400 600 800 1000 1200

Time (a)

Fig. 22 - Measured and calculated trends of IC Internal pool fluid temperature

(bottom level)

A3-11
C9

110.0

100.0

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0

--- a- I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC37TEMPF661O10000

YYY IC37TEMPF582I0000

ZZZ E12ATF-SC-10

t • I aI a I

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 23 - Measured and calculated trends of IC external pool fluid temperature

(top level)

E

1!

70.0

60.0

50.0

40.0

30.0

20.0

10.0 L--

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 24 - Measured and calculated trends of IC external pool fluid temperature

(level 11)

A3-12
0

C.

E

A

40.0

37.5

35.0

32.5

30.0

27.5

25.0

22.5

20.0

17.5

15.0 -

-200

PIPER-ONE Teat PO.IC-2A

Post-test calculation

RELAPS/Mod3.1

ioxIC37TEMPFOG6070000

YYY IC7TrEMPF660080000.

ZUZ E12ATF-SC-12

S I 0 3 5 I U S S S I S I

0 200 400 600 800 1000 1200

Time (s)

Fig. 25 - Measured and calculated trends of IC external pool fluid temperature

(middle level)

E

A

22.500

22.000

21.500

21.000

20.500

20.000

19.500

19.000

18.500

18.000

17 nn

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

S . U . IU I

XXX IC37TEMPF551010000

YYY IC37TEMPF;652O10000.

ZZZ E12ATF-SC-14

xy

-2200 0 200 400 600 800 1000

Time (s)

Fig. 26 - Measured and calculated trends of IC external pool fluid temperature

(bottom level)

1200

A3-13
400.

350.

300.

250.

200.

150.

E

1-

* I • I 5 I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC37TEMPG500080000-

YYY E12ATF-IC-0

ZZZ E12ATSAT

100.

0.

-200

I I |

0 200 400 600 800 1000 1200

Time (s)

Fig. 27 - Measured and calculated trends of steam temperature at IC inlet

compared with experimental saturated temperature

140.

120.

100.

3

0

C.

s0.

60.

40.

20.

0.

-20. '-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 28 - Measured and calculated trends of IC exchanged power

A3-14
140.

120.

100.

80.

60.

40.

E'

I!

20. 0. -

-20.

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 29 - Measured and calculated trends of temperature difference between

Internal and external side of IC tubes wall (top elevation)

300.

250.

200.

E

A

1SO.

100.

So.

0.

-50. "

-200 0 200 400 600 800 1000 1200

Time (a)

Fig. 30 - Measured and calculated trends of temperature difference between

IC fluid and external side of IC tubes wall (middle elevation)

A3-15
250.

200.

150.

100.

5.

0

0

3-I.

50.

0.

-50.-

"dl,W U zuu 400 600 800 1000 1200

Time (s)

Fig. 31 - Measured and calculated trends of temperature difference between

Internal side of IC tubes wall and IC pool fluid temperature (top elevation)

xlO 43.00

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX IC37HTHTC515000100

YYY IC37HTHTC515000101

2.50 1-

E

aIn

2.00 I

1.50

1.00

0.50

0.00

6.

-0.50 L

-20

m I m m m

a a I I I a I

i0 0 200 400 600 800 1000 1200

Time (s)

Fig. 32 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (top elevation)

A3-16
K 01.60 4.0

9.E L1

1.40

1.20

1.00

0.80

0.60

0.40

0.20

PIPER-ONE Teot PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC37HTHTC515000300

YYY IC37HTI.JTC515000301

0:00

-0.20.200 0 200 400 600 800 1000

Time (s)

1200

Fig. 33 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (middle elevation)

9000

8000

7000

6000

RELAPSIIUod.

4-

S

C

4-

U

S

5000 1-

4000 1-

P E Test PO-IC-2A xxx IC37HTHTC515000500

calculation YYY IC37HTHTC515000501

I6ied3.1

3000

2000

1000

01-

-1000

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 34 -Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (bottom elevation)

A3-17
.9

0

1.400

1.200

1.000

0.800

0.600

0.400

0.200

0.000 -

_n o'flf

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

xxx Ic

YYy IC

zzz IC

M1 IC

AAA IC

. I I

37V010G51 501 0000 .

37V011DG515020000

37V0IDG515030000 -

37V0IDG515040000

37V0IDG51 5050000

10

'A #A

1 I I 1 I 1

-2?00 0 200 400 600 800

Time (s)

Fig. 35 - Calculated trends of IC tubes void fraction along the axis

1000 1200

3.500

3.000

2.500

2.000

1.500

1.000

0.500

0.000

_,V./1W•

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

^0 IM2/V CLrQIl w I %&&M

YYY IC37VELF515020000

ZZZ IC37VELF515030000

W IC37VELF515040000

MA IC37VEL 5 5

i I I

I a "V ;,JWV-2?00 0 200 400 600 800

Time (s)

Fig. 36 - Calculated trends of IC tubes liquid velocity along the axis

1000 1200

A3-18
E

0

4.000

3.000

2.000

1.000

0.000

-1.000

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX IC37VELG5150100O0

YYY IC37VELG515020000

ZZZ IC37VELG515030000

##W IC37VELG515040000

AAA IC37VELG515050000

I

14 A -

-2.000 '

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 37 - Calculated trends of IC tubes steam velocity along the axis

9

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSMod3.1

I I I 1 1 4 1

E

C

12

10

8

6

4

rIv vw.

A

XXX IC37HTMODE515o0o100

YYY IC37HTMODE5SINW206

ZZZ IC37HTMODE51500030Q

fl IC 37HITMODES15000400

T . 50Q 

- - I 2 AldF O, _ . # '5 . ý4~ A. 4A .

| I • i .... . S I I S

-200 0 200 400 600 800 1000 1200

Time (a)

Fig. 38 - Calculated trends of IC tubes heat transfer mode (Internal side)

A3-19
3

*1

I

* I I a a I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

a I J a 6 9 -

.%¥-" • . w

XXX IC37HTMODE5150001 01L

YYY IC37HTMODE515000201

ZZZ IC37HTMOOE51500030Ot

### IC37HTMODE515000401

MA IC37HTMOOE515000S0f

XV7I x1 X7 z X

2. X-40.7 - i - - - . - . - - -

I a

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 39 - Calculated trends of IC tubes heat transfer mode (external side)

A3-20
APPENDIX 4:

ICA6 Results

5.750

5.500

5.250

5.000

' 4.750

. 4.500

S4.250

4.000

3.750

3.500

3.650

-200

. . . .

PIPER-ONE Test PO-IC-2A

Post4est calculation

RELAPS/Mod3.1

XXX ICASPI30010000

YYY EI2APA-LP-1

I I i I m

0 200 400 600 g00

Time (s)

1000 1200 1400

Fig. 1 - Measured and predicted trends of lower plenum pressure

320.

300.

280.

260.

240.

220.

200.

I,-

180.

160.

140.

120.

-200

Fig

PIPER-ONE Test PO-IC-2A

Post4est calculation

RELAP51Mod3.1

)00( ICA6TEMPF130010000

'flY EI2ATF4LP-1

0 200 400 600 800 1000

Time (s)

.2 - Measured and calculated trends of lower plenum temperature

1200 1400

A4-1
S

S

a.

2

0

I290.0

280.0

270.0

260.0

250.0

240.0

230.0

-2

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXCX ICASHTTEMP200100810

Y'VY ICAGHTTEMP20010091a

ZZZ ICASHTTEMP200101010

"S E12ATC-31-9

i I m I m

p.

Wo 0 200 400 600 800 1000 1200

Time (s)

Fig. 3 - Measured and calculated trends of rod surface temperature (level 9)

1400

*0

CL

13.000

12.500

12.000

11.500

11.000

10.500

10.000

9.500

9.000

8.500

8.000

-200

Fig

!I

I

I

I

I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX ICASCNTRLVAR20

YYY E12ALP-CC-1

a a a a a a a * a a a a a I E

0 200 400 600 8M

Time (s)

4- Measured and calculated trends of core level

00 1000 1200 1400

A4-2
14.000

13.000 RELAP51Mod3.1

12.000

S11.000 '••r

10.000

9.000

8.000

7.000 ' ' '

-200 0 200 400 600 800

Time (s)

Fig. 5 - Measured and calculated trends of downcomer level

1000 1200 1400

100.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

XXX ICASCNTRLVAR40

VWY E12AWH-POWER

80. F __ A, . -__ -

r

0

a60.

40.

20.

0.

-20. L-

-200

2 1 1 a -- a a I * I I I I I I

0 200 400 600 800 1000 1200

Time (s)

Fig. 6 - Measured and calculated trends of core power

A4-3
0.400

6

0

'U

0.350

0.300

0.250

0.200

0.150

0.100

0.050

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

MX ICASMFLOWJ550000000

YYY ICA6MFLOWJW500000OO

ZZZ Et2AWW-lC-i

• g | dig

0.0001--

-0 .050 1.. L ' -200 0 200 400 600 800

Time (s)

Fig. 7 - Measured and calculated trends of IC mass flow rate

1000 1200 1400

S

0._

0

22.5

20.0

17.5

15.0

12.5

10.0

7.5

5.0

2.5

0.0

-2.5 L-

-200 0 200 400 600 800 1000

Time (s)

1200

Fig. 8 - Measured and calculated trends of IC differential pressure

A4-4
350.

300.

250.

200.

150.

S

I.

100.

50.

0. * , . , . . I . I I S S

-200 0 200 400 600 800 1000

Time (s)

Fig. 9 - Measured and calculated trends of IC Inlet fluid temperature

1200 1400

300.

250.

200.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

2I

E

9

150. -

W~O ICASTEMPF515030000

YYY E12ATF-IC-1

ZZZ EI2ATFC-IC2

100.

50.

-200 0 200 400 600

Time (a)

Boo 1000 1200 1400

Fig. 10 - Measured and calculated trends of IC tubes fluid temperature

(middle elevation)

A4-5
400.

350.

300.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX ICA6TEMPF515010000

YYY ICA6TEMPF$15020000

ZZZ ICA6TEMPF515030000 -

U# ICAeTEMPF515040000

AAA ICAOTEMPF51505000

S

I.

250.

200.

150.

100.

50.

0.-200

. S S S S S S S S S S S S S S

0 200 400 600

Time (s)

800 1000 1200 1400

Fig. 11 - Calculated trends of IC tubes fluid temperature along the axis

120.

100.

80.

60.

40.

S

I

E0

I20.

0.

-200 0 200 400 600

Time (3)

800 1000 1200 1400

Fig. 12 - Measured and calculated trends of IC outlet fluid temperature

A4-6
300. , , , , , , , , , ,

PIPER-ONE Test PO-IC-2A XXX ICA8HTTEMP51W500t01

Post-test calculation YYY EI2ATS4C-2

250 I RELAPS/Mod3.1

200.

ISO

i 150.

100.

50.

00.

50. I

0. * * . I p p p p p p p p p

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 13 - Measured and calculated trends of IC tubes wall surface temperature

(internal side top elevation)

3 0 0 . 1 . .. a. .

PIPER-ONE Test PO-IC-2A Xxx CA6HTTEMP5I500t01

Post-test calculation YYY ICA6HTTEMPS5000o01"

250. RELAP5/Mod3.1 Z# ICASHTTEMPS15000401

AAA ICA6HTTEMP515000501

200.

SO

• • 150. 0

50.

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 14 - Calculated trends of IC tubes wall surface temperature along the axis

(internal side)

A4-7
160.

140.

120.

~100.

1 80.

60.

40.

I I I

- I

- I

- I

~

I I I I I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

xxX ICA6I4TTEMP5ISOOOIIO.

YYY E12ATS-lC-1

20.

0. I.

!00 0 200 400 600 B00 1000 1200 1400

Time (s)

Fig. 15 - Measured and calculated trends of IC tubes wall surface temperature

(external side top elevation)

160.

140.

120.

2. 100.

80.

,- 60.

40.

20.

0. L,

-200 0 200 400 600 800 1000 1200 1400

Time (9)

Fig. 16 - Measured and calculated trends of IC tubes wall surface temperature

(external side level 3)

A4-8
140.

I

120. RELAPS/Mod3.1 s# EI2AT$-IC-e

100.

go.

60.

40.

20.

0. t . I I I I I I I p p p '

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 17 - Measured and calculated trends of IC tubes wall surface temperature

(external side middle elevation)

1400

i.

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

- I

- I

PIPER-ONE Test PO-IC-2A XXX ICA6HTTEMP5I5000S10.

Post-test calculation YYY EI2ATS-IC-7

RELAPStMod3.1

* I

* I

* I

10.0 1-20

p p p p p p p p p p p p p p p

10 0 200 400 600

Time (a)

800 1000 1200 1400

Fig. 18 - Measured and calculated trends of IC tubes wall surface temperature

(external side bottom elevation)

A4-9
120. S i I * * e I | i e

PIPER-ONE Test PO-IC-2A XXX ICASTEMPF561010000

Post-test calculation YYY ICASTEMPF562010000

RELAPSiMod3.1 ZZZ EI2ATF-SC-1

80.

60.

E

40.

20.

20.

0. I * * . * * " * C C C C C C C

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 19 - Measured and calculated trends of IC Internal pool fluid temperature

(top level)

100.0 1 1 . , . . a . .

PIPER-ONE Test PO.IC-2A xxx ICASTEMPF560110000

90.0 Post-test calculation YYY ICASTEMPF56OI20000

RELAP5IMod3.1 ZZZ EI2ATF-SC-2

80.0

70.0

60.0

50.0 C40.0

30.0 -•

20.0 - ¥,

I-I

10.0 * C A I I I I C C C I 1 C C

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 20 - Measured and calculated trends of IC internal pool fluid temperature

(level 2)

A4-10
30.0

28.0

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXXC ICASTEMPF560080000

YYV EI2ATF-SC-4

ZZZ EI2ATF-SC-8

### E12ATF-SC-4

26.0 1-

6~

S..

S

0.

24.0

22.0

I-I

20.0

18.0 1

16.0-2

I

200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 21 - Measured and calculated trends of IC internal pool fluid temperature

(middle level)

21.500

21.000

20.500

20.000

19.500

19.000

S

0L.

e18.500

18.000

PiPER-ONE Test PO-IC-2A xxx ICA6TEMPF551010000

Post-test calculation YYY ICASTEMPF552010000

RELAP5IMod3.1 ZZZ E12ATF-SC-6

* I

* I

* I

17.500 F

17.000 F

16.500 '

-20 0 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 22 - Measured and calculated trends of IC Internal pool fluid temperature

(bottom level)

A4-11
I

I

2

S

I0

0

I.I110.0 , 1 1 a I 1 , . . . . . .

PIPER-ONE Test PO-IC-2A XXX ICASTEMPF66101C

100.0 Post-test calculation YYY ICASTEMPF56201C

RELAPSIMod3.1 ZZZ EI2ATF-SC-10

90.0

80.0

70.0

60.0

50.0

40.0

30.0

20.0

10.0 * p p J p S S S S • S °

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 23 - Measured and calculated trends of IC external pool fluid temperature

(top level)

65.0 1 1 . . . . . . .

PIPER-ONE Test PO-lC-2A XXX ICA6TEMPF66009

60.0 Post-test calculation YYY ICA6TEMPF66010

I RELAPS/Mod3.1 ZZZ ICASTEMPF66011

US EI2ATF-SC-1I

55.0

50.0

45.0

40.0

35.0

30.0

25.0

20.0

15.0 I I S I I I S I I S S S S

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 24- Measured and calculated trends of IC external pool fluid temperature

(level 11)

1400

1400

A4-12
34.0

32.0

30.0

28.0

26.0

24.0

22.0

E

A

PIPER-ONE

Post-test ca

RELAP51Mo

Test PO-IC-2A XXX ICASTEMPF660070000

iculation YYY ICA.TEMPF660080000

d3.1 ZZZ EI2ATF-SC-12

20.0

18.0

-2200 0 200 400 600 800 1000 1200

Time (s)

Fig. 25 - Measured and calculated trends of IC external pool fluid temperature

(middle level)

1400

E

A

22.500

22.000

21.500

21.000

20.500

20.000

19.500

19.000

18.500

18.000

17.500

PIPER-ONE Test PO-IC-2A X)0( ICASTEMPF551010000

Post-test calculation YYY ICASTEMPF652010000

' RELAPS/Mod3.1 ZZZ EI2ATF-SC-14 RELP5 H3I

ft5

-2200 0 200 400 600 800 1000 1200

Time (s)

Fig. 26 - Measured and calculated trends of IC external pool fluid temperature

(bottom level)

1400

A4-13
400.

350.

300.

5. 250.

U

I

* I

* I

* I

- I

- I

- I.

I I i I i

PIPER-ONE Test PO-I.2A

Post-test calculation

RELAPS/Mod3.1

XOC ICA6TEMPG500080000 -

YYY E12ATF-IC-0

ZZZ E12ATSAT

200. 1

150.

100.

50.

. I I I I I I I I I I I I

-200 0 200 400 600 800 1000 1;

Time (s)

Fig. 27 -- Measured and calculated trends of steam temperature at IC inlet

compared with experimental saturated temperature

I I

200 1400

1000

800

600

0 400

0

0~

200

0

-200 1~

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 28 - Measured and calculated trends of IC exchanged power

A4-14
140.

120.

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

X)XC ICA6CALC

YYY E12EXP

100. F

1.

80.

60.

40.

20.

0. 1--- - - - - - - - - - - - - - - - - - -a_

-20. L-

-200 0 200 400 600 800 1000 1200

Time (s)

Fig. 29 - Measured and calculated trends of temperature difference between

Internal and external side of IC tubes wall (top elevation)

180.

160.

140.

120.

100.

80.

60.

C.

E

A

II

PIPER-ONE Test PO-IC-2A

Post-test calculation

IELAP5!Mod3.1

(rfu*WIr

XXX ICASCAL.C

YYY E12EXP

40.

20. lK!

k .

0. F- -

I • I

-20

.20l0 0 200 400 600 800 1000 1200

Time (s)

Fig. 30 - Measured and calculated trends of temperature difference between

IC fluid and external side of IC tubes wall (middle elevation)

A4-15
250.

200.

150.

100.

50.

0

I

.-501L

0 200 400 600 800 1000 1200

Time (s)

Fig. 31 - Measured and calculated trends of temperature difference between

Internal side of IC tubes wall and IC pool fluid temperature (top elevation)

x10 4

3.00

2.50 t

C'd

C

.3

0

(I

0

2.00 1

1.50

* I

- I

- I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

XXX ICA6HTHTC51500D00O

YYY ICA6HTHTC515000101

1.00

0.50

0.00

-0.50 '

-2C10 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 32 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (top elevation)

A4-16
9000

8000 F

q * U U I i I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

a I a a

XXX ICA6HTHTC515000300

YYY ICA6HTHTC515000301

7000 1- 2

I

S

C

I

0

6000 1-

5000 1-

4000 1'

3000 1-

2000 F

1000 F

0oF-*

-1000-2( 0 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 33 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (middle elevation)

2

C

0

*13

S

1;

C

S

S

S

2500

2000

1500

1000

* I

- I

* I

- I

* I

- I

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPS/Mod3.1

- I a I

XXX ICASHTHTC51 5000500

YYY ICASHTHTC515000501-

500 1

0 ----------------------------

m i i i i I i m i i i m i

-500

-2€00 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 34 - Calculated trends of the heat transfer coefficient at the Inside

and the outside of IC tubes wall (bottom elevation)

A4-17
.2

0

0

0

U

.2

0

1.400 , , , , , , 1 

PIPER-ONE Test PO-IC-2A xxx ICA

Post-test calculation YYY ICA

1.200 RELAPS/Mod3.1 ZZ# ICA

M ICA

AAA ICA

1.000

0.800

0.600

0.400

0.200

0 .0 0 0 - - . ... . ... . .. . . . . . ... . .

-0.200

-200 0 200 400 600 800 1000

Time (s)

Fig. 35 - Calculated trends of IC tubes void fraction along the axis

1200 1400

1.600 , 1 a a I I I I a

PIPER-ONE Test PO-IC-2A XXX ICA6VELF515010000

1.400 Post-test calculation YYY ICA6VELF5150000.

RELAP5/Mod3.1 ZZ8 ICASVELF515040000

1.200 AAA ICA6VELF515050000.

1.000

0.800 0.00 I

!!

0.200 -

0.000 .. 40- 

-0 .2 0 0 1 j , , I I t I , ,

-200 0 200 400 600 800 1000 1200 14

Time (s)

Fig. 36 - Calculated trends of IC tubes liquid velocity along the axis

00

A4-18
1.000

E

I S I l I i I 4 1 a

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSIMod3.1

xxx

fyY

znz

#5S

AAA

I i I I

ICA6VELG515010000

ICA6VELG515020000

ICASVELG515030000

ICA6VELG515040000

ICASVELG515050000

0.800

0.600

- 0.400

' 0.200

0.000

-0.200

4.400

-0.600

Uiiiii

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 37 - Calculated trends of IC tubes steam velocity along the axis

I

5-

0

.5-

0,

C

S

5-

S

S

12

10

a

6

4

PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAP5/Mod3.1

4 Z- A. Zw, ZA ' , 

XXX ICABHTMODE515000I 02

YYY ICA6HTMODE5I5000200

ZnZ ICA6HTMODE515O00309

##t ICASHTMODE5ISOOO400

~ riIQMHTMO

2 __Vv_ AV&V A-DA 74A ----- T4A- -_-X&A ,

I S S S I I I S I * I I I I I

-200 0 200 400 600 800 1000 1200 1400

Time (a)

Fig. 38 - Calculated trends of IC tubes heat transfer mode (internal side)

A4-19
PIPER-ONE Test PO-IC-2A

Post-test calculation

RELAPSIMod3.1

ICA6HTMODE5I5000101

ICASHTMODE515000201

ICA6HTMODESI5000301

ICA6HTMODES15000401

ICA6HTMODE515000501

3

I

2

-200 0 200 400 600 800 1000 1200 1400

Time (s)

Fig. 39 - Calculated trends of IC tubes heat transfer mode (external side)

A4-20
APPENDIX 5:

Listing of RELAP5/MOD3.1 input deck

apgoic-02

100 new trenaent :01 mgp-bhk

• t|im *tsep

• mint most ale Mae 201 100. 1.e-7 i.e-i 07503 20 500 500 1a 100. 1.:-? 1.:-i *70@3 2: 00 1:00 i@ 203 430. 1..-7 I.._3 070.3 1600 2000 2006 204 442. 1.0-? S.e-4 07003 2000 2009 2000 205 730. 1.0-7 1..-3 07003 1.e. M.ee 2... 20: 1200. 1.0-7 1.0-1 07003 0 i20 0 i040 207 i.,f 1.0-? 1.*-1 07003 20 1 00 1i4e

added minor edit request

2000I001 htmode 515000100 20200002 htmode 515000200 20800003 broode 515000300 e0800004 htmod. 515000400 20000005 tcoe 515000500 20000000 htmod 515000101 20800007 htmde 515000201 20000008 htmode 515000301 208000090 htmode 515000401 20400010 htmode 515000501

* minor edit request

Spressures and fluid temperatures 301 p 130010000 * pa-lp-1 302 p 24S010000 a ed 303 tompf 100010000 * Ip 304 tompf 110040000 * Ip middle 305 tempt 140010000 core inlet 304 tompf 200010000 core hot 307 tempt 200070000 core middle 308 tompt 200140000 core top 300 tempg 200140000 core top

* fluid temperatures 310 tempf 150010000 * by guide tube 311 tompf 155010000 * bypass bot 312 tempf 145010000 bypass middle 313 tempf 175010000 * bypass top 314 tempg 175010000 * bypass top 315 tempf 220010000 * up 314 tempa 220010000 * up 317 tempf 245010000 • ed 318 tempo 245010000 * ad

• fluid temperatures

310 temptf 270010000 320 tempo 270010000 a

321 tempf 300010000

322 tompf 310010000 323 tompf 320150000 324 tempf 315150000 325 tompf 330010000 0

324 tompf 345010000 327 tampf 345050e00 4

• le•es

328 ontrivar 010 * dc-ann 329 antelvar Olt * dc-jp 330 antrIvar 015 * Ip 331 antrlvar 014 c core 332 entrivar 017 a up 333 antrivar 020 • core total 334 ontrivar 030 - bypass 335 antrIvar 035 sea 334 entriver 650 • fuel box exterior

• quality & void fraction 337 voldo 200010000

336 voldg 200080000 0 330 voldg 200130000 340 voidg 200140000 341 voidg 200150000 342 voidg 245010000 343 qualm 200100000

344 quals 200110000 345 qualm 200120000

Smess* flowrates 344 mflowj 340000000 347 mtlowj 130010000 348 mflowj 130020000 340 mflowj 140020000. 350 mfloyj 205010000 351 mflowj 205020000 352 mflowj 3100010000

353 mflowj 235010000 354 mflowj 335020000 •

* mass flowrateI 355 mflowj S05000000 io top 354 mflowS 245010000 357 flowj 225020000 * 356 mflowj 245020000

350 mflowj 270020000 300 iflowj 503010000 * 301 mflowl 504010000

343 AflowJ 4430100000 343 inflowS 340010000

god su race temp

344 httemp 200140110 5

345 htteop 320100410 344 httemp 300100510 347 httemp 200100710 5

301 httemp 300100810 5

340 httss 300100010 5

170 httesp 300101410 5

371 httemp 200101210 * 372 httep 2 00101410 *

: quality a void traction (2nd group)

373 voido 245010000 374 voido 240610000

375 voldo 2460030000 370 voldg 250016000 377 void: 250 30000 370 voidq a5s050000o 370 voldg 255010000

300 void 2355e1e000 301 voidg 210010000

382 ontrivar 040 core power 30 onrva :e*I power 304 ontrrIer 041 * 1c power 385 ontriver 042 " ic power 304 ontrivar 043 * I. power

-------------------------------------------

trips ------------------------------------------

Ip vlv 501 time 0 ge null 0 08. 1 * op. vlv ip-1p 502 time 0 ge null 0 1.e* 1 a o10. vlv lp-Jp

s etart beat loesee@ ep. annulus S07 time 0 go null 0 100. 1 .

• start beat losse* upp. do 508 time 0 go null 0 100. 1 .

b beat losses 509 time 0 go null 0 100. 510 time 0 go null 0 1.e 511 tme 0 ga null 0 0.

: core 4 bypass power 513 time 0 go null 0 100. 515 time 0 go null 0 500. heat.

5 fbI A fb2 beat losose (only fbi u 514 time 0 go null 0 300. $17 time 0 go null 0 I.eS

Ic loop Oontrol top viV 520 time I go null 0 104. 523 time 0 go null 0 108. 5s3 time 0 go null 0 705. 554 time 0 go null 0 1204. 414 520 zor 523 432 553 acr 554 433 414 or 632

• 1o loop control hot viv S21 time 0 go null 0 132. 522 time 0 go null e 400. 551 time 0 go null 1 704. 552 time 0 go null 0 1204.

415 521 mot 522 430 551 zot 552 431 f15 or 430 431 521 and S21

• added break control for pa-ic-2 540 time 0 go null 0 710.

I co control water In. 50 time 0 go null e 440.0o 541 time 0 go null 0 400.05 435 500 "or 501

i co control water out. 542 time 0 go null 0 401.04 503 time 0 go null 0 903.[0 430 562 "r 543

- steam line (tj 4331 525 time 0 go null 0 1.06

: pressure Control

520 tim 0 go null 0 -1. 527 time 0 ge null 0 10. 520 time 0 go null 0 00. 417 527 zor 524

fw control

529 time 0 to null 0 1.06

I *

I - table 001

I * start rod beat I e start bypass

tliLted)

I • fbl start I fb2 Mstart

I* op vlv io top 1 * ci viv to top

I* op Wv co top

I ci a vIV ic top a & op/cl io top a * op/cl 1i top a - op/cl to top

I op vvi IQ bat

I * ci viV Ic bot I * op lv 1o bhot I * 01 vlv t0 bat

a a op/cl So bot n - op/cl Is hot n • op/clt c hot n • opl/l ic bot

I*

I*

I*

C,

I•

1 actual CIO.

n actual op.

Is

* auxiliary systems S30 p 100e10000 go null 532 p 10001i00S ge null 534 p 1i0010000 go null 534 p 100010000 go null

0

0

0

0

1.e0 1 -start ipci 1.04 I 9 start ipas

1.06 1 -start bpcs 1.00 1 * start Iposh

A5-I
- erv Control 537 p 245010000 ge null 0 36.50.5 n * 533 p 245010000 It null 0 200.0.5 1 *

533 p 245010000 It null 0 32.50.5 n * oto. ero 602 537 zor 539 n - op. erv

: ads control 546 tim 0 gonull 0 100. 1 - ads

541 p 245010000 go null 0 70.50O5 n * 4d1 540 and 541 1 - op. ads

• draining Sea 576 time 0 go null 0 1.04 1 - op. drain. ann

571 ontrlvar 035 go null 0 1.*4 n - lO. dre. en.

• heat losses o tank (including external pipes) & to line 11q. 580 time 0 ge null 0 200. l *

: heat losses I* line 581 time 0 go null 0 100. 1 •

• heat loese ad

582 time 0 ge null 0 100. 1 .

: heat looses core region (external vessel)

563 time 0 go null 0 80. 1 .

• end trip signal 512 time 0 go null 0 1300. 1 * end of problem

400 512 * end of problem

------------------------------------------

*hydraulic components ---- * -------------------------------------

• lower plenum hot 1000000 lv.plb branch

1000001 2 . 1 1000101 0.010703 0.3 0. 0. 90. 0.3 4.o-5 0.045 00000

1000200 000 5.04544 1.10004 2507.o3 0. 1001101 100010000 110000000 0.00 0. 0. 000000 1002101 345010000 100010000 0.00 0. 0. 000000

1001201 0. 0. 0.

1002201 0. 0. 0.

• lower plenum contral 1100000 lp.*ld pipe

1100001 5 1100101 0.010709 S 1100301 0.250 2 1100302 0.1443 4

1100303 0.1114 S

1100401 0.000 5 1100801 90.0 S 1100001 4.00-5 0.045 5

1101001 00000 S 1101101 000000 4 1101201 000 5.045o4 1.100e4 2537.e3 0.0 0. 5

1101300 1

1101161 0.0 0.0 0.0 4

: lower plenum added br. for ic ConA. 1110000 lw.icl branch

1110001 1 1 1110101 0.010705 0.1815 0. 0. 00. 0.1415 4.6-5 0.0G 5 00000

1110200 000 5.04506 1.100l 4 25?7.o3 0. 1111101 110010000 111000000 0.00 0. 0. 000000 1111201 0.0 0. 0.

Slotwe plenum added br. for Io Conn. 1120000 lw.1c2 branch

1120001 1 1 1120101 0.010703 0.14 0. 0. 30. 0.14 4.e-5 0.045

00000

1120200 000 5.045o4 1.100e4 2597.*3 0. 1121101 111010000 112000000 0.00 0. 0. 000000 1131201 0.0 0. 0.

• lover plenum topi

1150000 lp.top1 branch 1150001 2 1 1150101 0.010705 0.1745 0. 0. to. 0.1745 4.e-5 0.045

00000

1150200 000 5.04541 1.120e4 2597.e3 0.

1151101 112010000 113000000 0.00 0. 0. 000000 1152101 115010000 120000000 0.00 0. 0. 000000

1151201 0.0 0. 0.

1152201 0.0 0. 0.

- lower plenum topa

1200000 lp.top2 pipe

1200001 2

1200101 0.00572 2 1200301 0.2 2 1200401 0.000 2 1200401 30.0 2 1200801 4.0o-5 0.065 2

1201001 00000 2

1201101 000000 1 1201201 000 S.04546 1.124*4 2557.03 0.0 0. 2 1201300 1 1301301 0.0 0.0 0.0 1

: lower plenum top3 1300000 lp.topl branch

1300001 2 1

1300101 0.008457 0.174 0. 0. t0. 0.170 00000

1300200 000 5.04Se4 1.120o4 2537.*3 1)01101 120010000 13000000 0.00 0. 0. 1302101 130000000 145000000 0.00 0. 0. 1301201 0.0 0. 0.

1302201 0.0 0. 0.

* lower plenum top4 1350000 lp.tolp branch

1350001 1 1 1350101 0.006457 0.3 0. 0. 30. 0.2 00000

1350200 000 5.04504 1.120e0 2537.03 1351101 130010000 135000000 0.00 0. 0. 1351101 0.0 0. 0.

- lower plenum topS

1400000 lp.tops branch

1400001 2 1 1400101 0.008457 0.2 0. 0. 30. 0.2 00000

1400200 000 5.04546 1.120*4 2507.o3 1401101 135010000 140000000 0.00 0. 0.

1402101 140010000 1.315 200000000 e-4 0.3 3.9

1401201 0.0 0. 0.

1402201 0.0 0. 0.

• core by bottom hor

1450000 by.bhor pipe

1450001 7 1450101 0.000286 7 1450301 0.2 2

1450302 0.1032 7 1450401 0.000 7

1450401 -30.0 2 1450402 0.0 7

1490001 4.7o-8 0.0 7 1451001 00000 7 1451101 000000 4 1451201 000 5.04504 1.120*6 25t7.@3 0.0

1451300 1

1451301 0. 0.0 0.0 4

: guide tube - bot.by

1500000 gui.tub pipe

1500001 5

1500101 0.003253 5 1500301 0.2440 5

1500401 0.000 5 1500001 30.0 5 1500801 4.00-5 0.0 S

1501001 00000 5 1501101 000000 4

1501201 000 5.045ol 1.12006 2597.e3 0.0

1501300 1 1501301 0. 0.0 0.0 4

: bypass vertical bet

1550000 by.vertl branch

1550001 3 1 1550101 0.00003S 0.223 0. 0. 30. 0.223 0o000

1550200 00 5.04544 1.12004 2537..3

1 51101 145010000 1550000000 0.50-4 1. 1. 1552101 150010000 15000000 .827e-3 0.1 0.1

1553101 1S5010000 140000000 0. 0. 0. 1551201 0. 0. 0. 1552201 0. 0. 0. 1553201 0. 0. 0.

• bypase vertical n2

1400000 by.vort2 pipe 1400001 10

1400101 0.00083S 10 1400301 0.2133 10

1400401 0.000 10 1400401 30.0 10 1400001 4.00-S 0.0 10 1001001 00000 10

1001101 000000 3 1401201 000 5.045O4 1.120*6 2517.e3 0.0

1401300 1

1601301 0. 0.0 0.0 1

- bypaee vertical n3

1450000 by.vrt3 branch

1850001 2 1

1850101 0.000835 0.201s 0. 0. 30. 0.301

00000

1450200 000 5.045.4 1.120e4 3597.03 1451101 160010006 145000000 0. 0. 0. 1452101 145010000 170000000 0. 0. 0.

14S1201 0. 0. 0.

1452201 0. 0. 0.

• bypass vertical no

1700000 by.vort4 pipe

1700001 10

1700101 0.000035 10 1700301 0.235 10 1700401 0.000 10

1700801 30.0 10 1700601 4.00-S 0.0 1t 1701001 00000 10

1701101 000000 5

1701201 000 5.04504 1.12004 2537.e3 0.0

1701300 1

1701301 0.0 0.0 0.0 3

4.o-S 0.045

0.

000000 00560000

4.0-5 0.049

0.

O00000

4.a-5 0.065

0.

000000

000000

0. 7

0. 5

4.0-S 0.0

000000

000000

000000

0. 10

LS 4.0-5 0.0

0.

000000

000000

0. 10

A5-2
1700001 10

1700101 0.000035 10

1700301 0.235 10

1700401 0.000 10

1700401 50.0 10

1700801 4.00-S 0.0 10

1701001 00000 10

1701101 000000 0

1701201 000 5.4Sa0 1.120a0 250

1701300 1

1701301 0.0 0.0 0.0 0

• bypass ertlcal nS

1750000 by.raftS branch

1750001 2 1

1750101 0.000835 0.2075 0. 0.

00000

1750200 000 S.04S50 1.120e0

1751101 170010000 17S000000 0.

1752101 175010000 100000000 0.

1751201 0.0 0. 0.

1752201 0.0 0. 0.

: bypass horizontal top

1600000 by.hort pipe

1600001 S

1800101 0.00119 5

1000301 0.1774 5

1800401 0.000 5

1800001 0.0 S

1600001 4.0.-5 0.0 5

1801001 00000 S

1801101 000000 4

1001201 000 5.045-0 1.120*0 25#

1001300 1

1801301 0.0 0.0 0.0 4

• oare channel

2000000 core pipe

2000001 10

2000101 0.002043 14

2000102 0.003S50 14

2000301 0.205 14

2000302 0.220 15

2000303 0.2 10 2000401 0.000 10

2000001 90.0 10

2000001 4.0.-S 0.013 10

2001001 00000 14 2001101 000000 15

2001201 000 5.04500 1.120.0 255

2001202 000 5.445.0 1.12186 25S

2001203 000 5.04500 1.120.0 251

2001204 000 S.04506 1.12804 25

2001205 000 S.04506 1.128o0 25

2001204 000 5.04506 1.12040 251

2001207 000 5.045O4 1.12040 25S

2001208 000 5.04504 1.12800 259

3201300 1

2001301 0. 0.0 0.0 S

2001302 0. 0. 0.0 10

2001303 0. 0. 0.0 15

* Coro top

2050000 cora.top branch

2050001 2 1

2050101 0.01028 0.22 0. 0.

00000

2050200 000 S.04506 1.15104

2051101 200010000 205000000 1.4490

2052101 180010000 200000000 0.03.-

2051201 0. 0. 0.

2052201 0.0 0. 0.

• upper plonus 1

2100000 up.col branch

2100001 2 1

2100101 0.01028 0.22 0. 0.

00000

2100200 000 5.04504 1.15104

2101101 205010000 210000000 0.

2102101 210010000 220000000 0.

2101201 0. 0. 0.

2102201 0. 0. 0.

7.03 0.0 0. 10

s0. 0.2075 4.0-S 0.0

2597.03 0.

0. 0. 000000

0.1 0.1 000000

7.03 0.0 0. S

97.e3 0.0

M7.03 0.

07.03 0.

97.e3 0.

97.03 0.

97.e3 0.

97.e3 0.

97.e3 0.

0.

0.

0.

0.

0.

0.

0.

0.

2

4

0

10

12

14

14

3251101 225010000 230000000 0. 0. 0. 000000 2252101 225010000 210000000 0. 0. 0. 000000

22S1201 0. 0. 0.

2252201 0. 0. 0.

- stoam separator annulus

2300000 oaa pipe

2300001 0

2300101 0.007100 0

2300301 0.512 1 2300302 0.400 a

2300401 0.000 •

2300 01 00.0 8

2300001 4.0.-S 0.052 0

2301001 00000 0

2301101 000000 7

2301201 000 5.04500 1.15104 2597.e3 0.0 4.0 S

2301202 000 S.04500 1.15164 2557.03 0.0 4.0 0

2301203 000 5.045. 0 1.10104 2907..3 0.5 0.0 a

2301300 1

2301301 0. 0. 0.0 7

- steat do.e hot (k in J. 2 changed for po-ic-l1)

2350000 .do.bot branch

2300001 6 1

2350101 0.01038 0.246 0. 0. 50. 0.240 4.0-S 0.0 00000

2350200 000 5.045o0 1.1Sl5o 2507.ol 0.5

2351101 220010000 239000000 0. 0. 0. 000000

2352101 235000000 230010000 3.94e-4 100. 100. 000000

2353101 235000000 295000000 0.00420 0.1 0.1 000000

2354101 230010000 240000000 0. 0. 0. 000000

2351201 0.0 0. 0.

2352201 0. 0. 0.

2353201 0. 0. 0.

2354201 0. 0. 0.

• steam do". vsrt.left

2400000 sd.ver.1 pipe

2400001 4

2400101 0.01038 4

2400301 0.25 4

2400001 0.000 4

2400001 90.0 4

2400801 4.0o-S 0.0 4

2401001 00000 4

2401101 000000 3

2401201 000 5.040.0 1.15100 2597.03 0.0 0. 4

2401300 1

2401301 0. 0. 0.0 3

• steam dome top left

2450000 odo.top branch

2450001 2 1

2450101 0.01030 0.305 0. 0. 50. 0.305 4.o-S 0.0

00000

24S0200 000 5.04506 1.1514e 2597.03 1.

2451101 240010000 245000000 0. 0. 0. 000000

2452101 245000000 250000000 0. 0.1 0.1 000000

2451201 0. 0. 0.

2452201 0. 0. 0.

• steam dome top har pipe

2500000 .d.toh pipe

2500001 5 2500101 0.005302 S

2500301 0.280 5

2500401 0.000 5

2500001 0.0 5

2500001 4.04-5 0.0 5

2501001 00000 5 2501101 000000 4

2501201 000 5.045.0 1.1521o 2597.02 0.05 0. S 2501300 1

2501301 0. 0.0 0.0 0

• steam dome hot hob pipe

2550000 ed.boh pipe 2000001 0

2990101 0.00570 5

2090301 0.3820

2550401 0.000 S

2550401 0.0 5

2550001 4.0o-5 0.074 5 2051001 00000 5

2551101 000000 4

2551201 000 0.04500 1.151o0 2597.e3 1.0 0. 5

2501300 1

2551301 0. 0. 0.0 4

• oj conneoting upper parts of ad

2590000 oj.ted sneljun

2590101 250010000 240000000 0.005302 0.1 0.1 000000

2590201 1 0. 0.000 0.000

• steam dome vert.rlght

2000000 sd.vor.r pipe

2600001 4

2000101 0.000447 4

2000301 0.2O 4

2000401 0.000 4

2000001 -50.0 4

2400801 4.0o-5 0.0 4

2001001 00000 4

2001101 000000 3

2001201 000 045.0o 1.1510o 2507.03 1.0 0. 4

2001300 1

2401301 0. 0. 0.0 3

* stam dome right part bottom

00. 0.22

2597.e3

-3 14.5 10.4

3 0.1 0.1

90. 0.22

2507.03

0. 0.

0. 0.

* steam sOparator pipe

220000 st.eep pipe

2200001 20

2200101 0.01028 2

2200102 0.00241 20

2200301 0.214 2

2200302 0.2345 20

2200401 0.000 20

2200001 50.0 20

2200801 4.0e-5 0.0 20

2201001 00000 20

2201101 000000 15

2201201 000 S.04506 1.151*6 2597.e3 0.

1.11504

2201202 000 5.04504 1.151*0 2057.03 0.

2201203 000 5.04500 1.lSleo 2597.e3 0.9

2201300 1

2201301 0.0 0. 0.0 1i

Sbaot sea

3250000 @@a.bat branch

2S20001 2 1

2250101 0.007150 0.34 0. 0. 10. 0.34

00000

2250200 000 5.045.0 1.12000 2057.03

4,0-5 0.0

0.

000000

000000

4 .e-9 0.0

0.

000000

000000

0. 10

0. 10 O. 20

4.-S5 0.052

0.

A5-3
2650000

2450001

2450101 00000

2650200

34051101

2652101

20S1201

2652201

* do top

2700000

2700001

2700101

00000

2700200

2701101

2702101

3701201

2702201

: do top

2750001 2150001

2750101

2750301

275O401

2750601

2750801

2751001

2751101

2751201

2751300

2751301

: df fv

2800000

2000001

2800101

00000

2000200

2001101

2002101

2001201

2802201

2050000

2050001

2050101

2050301

2050401 2550401 2850601

2851001

2851101

2851201

251300

2051301

: bypa.

2900000

2000101

2900301

2900401

2500601

2900801

2901001

2901101 2001201

2001300

2001301

• vlv of

2020000

2920101

1. 1. 2120201

2020300 2020301

2950000

2050101

2050301

2950401

2950601

2950801

2951001

2951101

2951201

2951300

2051301

: do at 3000000

3000001

3000101

00000

3000200

3001101

3002103

3003101

3001201

3002201

3003201

• do mi

.da.rlb

2

0.006647

000

260010000

265010000

0. 0. 0. 0.

branob

0.206 0. 0.

0.4506 1.15106

265000000 0. 270000000 0.

0.

0.

-90. -0.246 4.0-5 0.0

2507.e3 1.

0. 0. 000000

0. 0. 000000

do.top branch 2 1

0.005534 0.247 0. 0. -00. -0.247 4.,-S 0.0

000 5.04504 1.15104 2597.03 0.1 255010000 270000000 0. 0.1 0.1 000000

270010000 275000000 0. 0. 0. 000000

0. 0. 0.

0. 0. 0.

upotroon fv od.tufw pipe

4

0.005534 4 0.302 4 0.000 4

-90.0 4 4.00-S 0.0 4

00000 4 000060 3 000 5.04506 1.151*4 2597.*3 0.0 0. 4

I

0. 0. 0.0 3

connection zone do.fwa branch

2 1

0.00C534 0.3 0. 0. -00. -0.3 4.0-5 0.0

00* 5.04504 1.10*04 2507.03 0.

275010000 200000000 0. 0.1 0.1 000000

200010000 285000000 0. 0. 0. 000000

0. 0. 0.

0.0 0. 0.

dovnotream fw

d•.tdfw pIp*

6

0.005534 6 0.3 6

0.000 G

-00.0 0 4.00-S 0.0 G 00000 4 000000 5

000 5.045.6 1.1909s 2597..0 0.0 0. 6

I

0.0 0. 0.0 5

a of steeam don by.ed pipe 2

0.00124t 2 0.3295 2 0.000 2

0.0 2 4.00-5 0.04 2 00000 2

000000 1

000 5.0450* 1.100*6 2597.e3 0. 0. 2

1

0. 0.0. 0.0 1

f ,d bypoos

vlv.sdby valve

290010000 205000000 0.0012506 0.0 0.0 000100 1.

0 0.000 0.000 0.000

mtrvlv

570 571 1. 0.

a of steam dome by.a82 pipe

2

0.002765 2

0.3t 2 0.000 2

0.0 2 4.00-5 0.04 2

00000 2 000000 1

000 5.045e6 1.100*6 2597.03 0.0 0.0 2

I

0. 0.0 0.0 1

ddlo zone

dc.mal1 branch

3 1

0.00349 0.283 0. 0. -90. -0.283 4.o-S 0.0

000 5.045e0 1.1OOeO 2007.*3 0.

285010000 300000000 0. 0. 0. 000000

* 300010000 305000000 0. 0. 0. 000000

1 205010000 300000000 0.00046 0.1 0.1 000000

* 0.0 0. 0. 1 0.0 0. 0. * 0. 0. 0.

.ddle zone n2

3000000 do.Aida pviv

3050001 8 3050101 0.00349 3

3050102 0.004261 a 3050301 0.2t 3

30S0302 0.281 a 3000401 0.000 a 3000601 -00.0 0 3050801 4.0.-5 0.0 8

3051001 00000 8 3051101 000000 7

301201 000 5.04560 1

3051300 1

3051301 0.0 0. 0.

: do jet pump top 3100000 do.jpto bz

3100001 3 1 3100101 0.004261 0.335 00000

3100200 000 0.040. 3101101 300010000 310000

3102101 310010000 320000 310510l 310010000 315600

3101201 0.0 0. 0.

3102201 0. 0. 0.

3103201 0.0 0. 0.

- jot pump

3150000 jet.pump pipe 3150001 10

3150101 0.0013 1

3150301 0.373 1

3150401 0.000 1

31500601 -90.0 .1 3100801 4.00-5 0.0 1

3101001 00000 1

3151101 000000 1

3101201 000 5.0405o 1 3151300 1 3101301 0.0 0. 0.

- do annular pert 320000 do.ann pip*

3200001 10

3200101 0.0027 1 3200301 0.273 1

3200302 0.1 1

3200401 0.000 1 3200601 -00.0 1

3200001 4.0e-5 0.0 1

3201001 00000 1 3201101 000000 1

3201201 000 5.04506 1 3201300 1 3201301 0. 0. 0.

- do jot pump hot

3250000 do.jpbo b 32:0001 3 1 3200101 0.00426 0.327

00000

3250200 000 5.045a

32511*1 310010000 320004 3252101 325010000 330001

3253101 325010000 335000

3201201 0.0 0. 0.

3252201 0. 0. 0.

3253201 0.0 0. 0.

• do hot 3300000 do.jpbo bh

3300001 0 1

3300101 0.000 0.185 00000

3300200 000 5.045

.1006 2597.03 0.0 0.

0 7

anch

0. 0.

.4 1le00as

000 0.

000 0.

15.5

.5

.100.4 20

0 14

-00. -0.325

2097.*3

0. 0.

0. 0. 1. 1.

4.0-S 0.0

0.

000000

000000

000000

97.o3 0.0 0. 15

.0

.4

.5

15

.100*6 2597.*3 0.0 0. 1I

•0 14

ranch

0. 0. -90. -0.327 4.o.S 0.0244

G 1.10006 2597.03 0.

W00t 0. 1. 1. 000000

0000 0. 0. 0. 000000 6000 0. 0.1 0.1 000000

ranch

0.89.-3 0. -90. -0.185 4.0-5 0.0244

i0 1.100.0 2597.03 0.

• added break for po-to-2 3310000 br.vol tndpvol

3310101 0. 10. 10. 0. 0. 0. 4.0-S 0. 00000

3310200 000 3310201 0. 1.5:1 1.28600 2.:01.4 0. 3310202 1.6. 1.$0: 1.286005 3.01:0.

E fv injection In do 3320000 br.j tadpjun

3320101 330010000 331000000 0.0 3320200 1 540

3320201 -1. 0.0 0. 0.

3320202 0. 0.05 0. 0.

3320203 100. 0.00 0. 0.

3320204 101. 0.0 0. 0. 3320205 1.06 0.0 0. 0.

: lower plenum horizontal part

3350000 lp.horl pipe

3350001 4

3150101 4.0*42 2

3350102 0.00750 4

3350201 0. 1

3350202 0. 2 • 16.10.-

3350203 0. 3

3350301 0.257 4

3350401 0.000 4

3350001 0.0 4

3300801 4.0o-S 0.0 4 3300001 0. 0.0 1

3350902 0. 0. 2 * 0.57 0.57

3350903 0. 0.0 3

3301001 00000 4

A5-4
3351101 000000 3

3351201 000 5.045.6 1-10040 2597.*3 0.0 0.0 •

3351300 1

3351301 0.0 0.0 0.0 3

: lover plenum valve

3400000 va.lopl valve

3400101 335010000 3450000000 .S0OG-4 S.0 5.0 o00100 1.

1. 1. *1. 3400201 1 0.0 0.000 0.000

3400300 strVlv

3400301 501 502 1. 0.

: lover plenum bor-2 3450000 lp.hor2 pipe

3450001 5

3450101 0.00750 1

3450102 0.00137 5

3450301 0.10 1

3450302 0.18 3

34S0303 0.25 S

3450401 0.000 5

3450601 0.0 3

34S0402 -00.0 5

3450601 4.0.-S 0.0 5

3450001 0. 0.0 2

3450002 0.5 0.S 3

34•0003 0. 0.0 4

3451001 00000 5

3451101 000000 4

3451201 000 SO4SeO 1.100o6 2S07.e3 0.0 0. 5

3451300 1

3451301 0.0 0. 0.0 4

: fuol box exterior top

3400000 fuel.boX branch

3600001 2 1

3000101 4.480•4-3 0.429 0. 0. 00. 0.429 4.*-5 0.0

00000

3000200 000 5.04509 1.151.4 2507..3 1.

3401101 300010000 205000000 l.a-S 10. 10. 000000 •

3402101 300000000 370010000 0. 0. 0. 000000

3001201 0. 0. 0.

3602201 0. 0. 0.

: fuel box exterior

3700000 fuel.bo pipe

3700001 7

3700101 4.4894

*-3 7

3700301 0.53 7

3700401 0.000 7

3700401 00.0 7

3700601 •.0*-5 0.0 7

3701001 00000 7

3701101 000000 4

3701201 000 5.04564 1,lSIa4 2597.e3 0.0 0. 7

3701300 1

3701301 0. 0.0 0.0 4

: up lpse Injection tank olm

4000000 vlpCs tmdpvol

4000101 0. 10. 10. 0. 0. 0. 4.0-S 0. 00000

4000200 000

4000201 0. 22.7o5 4.134s4 2.001e4 0.

4000202 1000. 22.7.5 4.134e4 2.401*6 0.

4000203 le0 22.7.5 4.134e4 2.40104 0.

• Ipos Injection tj In up

4030000 upilpajc todpjun

4030101 400000000 210010000 0.0

4030200 1 532 p 110010000

4030201 -1. 0.0 0. 0.

4030202 0. 0.232 0. 0.

4030203 0.3006 0.232 0. 0.

4030204 0.40.4 0.200 0. 0.

4030205 0.06.6 0.100 0. 0.

4030204 1.10.4 0.173 0. G.

4030207 1.360. 0.144 0. 0.

4030200 1.44.0 0.120 0. 0.

4030200 1.9040 0.069 0. 0.

4030210 2.05.4 0.040 0. 0.

4030211 2.090o 0.046 0. 0.

4030212 2.15.0 0.0 0. 0.

4030213 0.00e4 0.0 0. 0.

• by Ip1e Injection tank @in

4100000 vbyce tadpvol

4100101 0. 10. 10. 0. 0. 0. 4.0-S 0. 00000

4100200 000

4100201 0. 22.75 4.134e4 2.601si 0.

4100202 1000. 22.7s5 4.134.4 2.60106 0.

4100203 3..0 22.7.5 4.134e4 2.001*6 0.

• by 11•1 injection tj

4130000 jby.,s twdpjun

4130101 410000000 17S010000 0.0

4130200 1 S36 p 110010000

4130201 -1. 0.0 0. 0.

4130202 0. 0.110 0. 0.

4130203 0.30e6 0.116 0. 0.

4130204 0.400e 0.105 0. 0.

413020S 0.6000 0.095 0. 0.

4130206 1.10*0 0,064 0. 0.

4130207 1.3804 0.074 0. 0.

4130208 1.44e6 0.000 0. 0.

4130200 1.00.0 0.044 0. 0.

4130210 2.0506 0.030 0. 0.

4130211 2.0904 0.024 0. 0.

4130212 2.15.4 0.0 0. 0.

• lpol tank csiluator 0200000 vipol tmdpvol

4200101 0. 10. 10. 0. 0. 0. 4.0-3 0. 0000o

4200200 000 4200201 0. 38.0S 4.134o4 2.001o40O.

4300202 1.e0 26.05 •.13044 2.001e 0.

• ipol Injeotion in oore.bypase

4230000 lpeIj.by tmdpjun

4230101 420000000 145010000 0.0

4230200 1 S30 p 110010000

4230201 -1. 0.000 0. 0. 4230202 0. 01300 0. 0.

42302030 0.30.6 0.340 0. 0.

4230204 0.500S 0.345 0. 0.

4230205 0.440. 0.330 0. 0.

4230204 0.004 0.310 0. 0.

4230207 1.25.0 0.250 0. 0.

4230306 1.4104 0.108 0. 0.

4230200 1.51*0 @.115 0. 0.

4230210 1.SS4. 0.060 0. 0.

4230211 1.65.0 0. 0. 0.

42302312 9.5106 0. 0. 0.

- *teen line downstream

4300000 ot.al tmdpvol

4300101 0. 3. 10. 0. 0. 0. 4.4-S 0. 00000

4300200 000

4300201 0. l.o5 4.175.S 2.50104 1.

4300202 1. 1.oS 4.175a5 2.S04.0 1.

4300203 1.0o 1.o5 4.175s5 2.500,0 1.

•steam line during steady *tat*

4330000 ete4m.lI tmdpjun

4330101 245010000 430000000 0.0

4330200 1 525

4330201 -1. 0.0 0. 0.

4330202 0. 0. 0.346 0.

4330203 1.06 0. 0.348 0.

• pro control volume

4400000 out.sl tmdpvol

4400101 0. 0.5 10. 0. 0. 0. 4.0-S 0. 00000

4400200 o00

4400201 0. 5.04504 1.151 0 2507.03 1.

4400202 1. 5.04SO4 1.15104 2507.13 1.

4400203 1.o4 S.045.0 1.1516 2507.*3 1.

Spressure control for steady stte

4430000 va.lopl valve

4430101 245010000 44000000 5.000-3 0.0 0.0 000100

1. 1. 4430201 1 0. 0.0403 0.000

4430300 mrvliv

4430301 617 528 1. 1.

• fv tank ssluator

4500000 tw.vol todpvol

4300101 0. 10. 10. 0. 0. 0. dc-S 0. 00000

4500200 000 4S00201 0. S.504 6.2840s 24.01.4 0.

4500202 1.*4 .5.54 4.20405 2.40160 0.

* fL Injection In do

4530000 fw. tmdpjun

4530101 450000000 200000000 0.0

4330200 1 520

4530201 -1. 0.0 0. 0.

4530202 0. 6.0443 0. 0.

4530203 100. 0.0443 0. 0.

4530204 101. 0. 0. 0.

4330205 1.00 0. 0. 0.

* swrv tank

4400000 out'vr t.apvol

4400101 0. 3. 10. 0. 0. 0. 4.6-S 0. 00000

4000200 000 4010201 0. 1.1S 4.175e5 2.50400 1.

4400202 1.eo 1.oS 4.175o5 2.50100 1.

• ler vIV

4430000 va.erv Valve

4430101 245010000 440000000 1.540-0 1.e-0 1.0-1 00010

1. 1.

4430201 0 0.000 0.000 0.000

4030300 mtrvlv

4030301 002 500 100. 0.

• ad. tvol

4700000 outed. tmdpvol

4700101 0. 10. 100. 0. 0. 0. 4.e-S 0. 00000

4700200 000

4700201 0. loS 03224. 2.30000o 1.

4700202 1.4 1.:: 03224. 2.50:0040 1.

* ads vlv 4730000 val.ads valve

4730101 245010000 470000000 36.3e-4 0.1 0.1 000100 1.

1.

4730201 0 0.000 0.000 0.000

4730300 trpvlv

4730301 401

• 1. line top

5000000 tolin.t pipe

5000001 10

5000101 3.70-4 S

5000102 3.7e-4 10

$000301 0.30 5

S000302 0.312 9

1.

0 1.

A5-5
5000303 0.212 10 5000401 0.0 10 5000001 0. 5

$000602 -90. 10 5000701 0. S 5000702 -0.212 t

5000703 -0.112 10 5000801 4.00.- 0.0 1* 5000001 0.0 0.0 4 5000002 0.3 0.3 5 5080003 0.0 0.0 0 5001001 01000 • 5001002 00000 10

5001101 000000 9 8001201 000 5.045.0 0.741o5S 2307.0) 1.

5001202 000 5.04500 0.7461.5 2S97.03 1. 5001203 000 5.045.4 0.7041.5 2507..) 1. 5001204 000 S.04544 1.1510.4 2507.*3 O.S

5001205 000 5.0450a 0.7401.5 2507..) 0.

5001301 0.0 0.0 0.0 0

: lvl to top

SOSGOO5 vlv.iot valve

5050101 245000000 500000000 3..-4 10. 10. 0oo

1.

5050201 0 0.000 0.000 0.000 5030300 trpvlv 500301 )03

: to top 5100000 top.Icb branch

3100001 2 0

5100101 0.00.4 0.2 0. 0. -00. -0.1 4.0-5 00000

5100200 000 5.045a0 0.740105 2507..) 5101101 510010000 513000000 0. 0.1 0.1 5102101 500010000 510000000 0. 0.1 0.1 5101201 o. 0. 0. 5102201 0. 0. 0.

* to control

5110000 locon tmdpvol

5110101 0. 10. 100. 0. 0. 0. 4.0-5 0. 00000

5110200 000 5110201 0. 3.506 0.$305 2.00306 0. * 5110202 1..4 3.504 4.S3.e 2.00364 0.

0.

0.

0.

0.

0.

0

7

0

0

10

100 1. 1.

1.0.5-

0.0

000000 000000

A vIV Io control

5120000 vlv.icc valve 5120101 520000000 511000000 3.0-7 100. 100. 0001 1.

3120201 0 0.000 0.000 0.000

5120300 trpvlv

5120301 035

• Is control 3130000 Ioeee tnapvol

5130161 0. 10. 100. 0. 0. 0. 4.0-5 0. 00000

5130200 000 5130201 0. 2.5.0 0.530S 2.00304 0. 5130202 1.0* 2.5.0 4.53*5 2.603)0 0.

• vIV to control

5140000 vlv.1CC valve

5140101 520000000 513000000 .0-4 100. 100. 0001 1.

5140201 0 0.000 0.000 0.000 5140300 t rpvlV

3140301 )03

: I tube.

5150000 la.tubea pipe Sis5001 5 3150101 3.05.-3 5

5150301 0.0052 5 3130001 5.0 5 1150001 -90. 5

3150801 4.00-S 0.018 5

5150001 0.0 0.0 4 S151001 00000 5

5151101 00a0c0 4

5151201 000 5.045.0 0.7401o5 2507.43.) 0.0

3I51301 0.0 0.0 0.0 4

• to bot 5200000 bot.IAb branch 5200001 2 0 5200101 1.00-4 0.1 0. 0. -to. -0.1 4.6-. 00000

5200200 000 3.045.0 0.7461.3 2508.03 0

5201101 513010000 520000000 0. 0.1 0.1 5202101 520010000 525000000 1.7.-4 0.1 0.1

53201201 0. 0. 0.

5202201 0. 0. 0.

• to tub. Internal to the tank

3250000 1c.tube1 pipe 3250001 14

5250101 2.4o-4 14

5230301 0.1 1

3250302 0.07875 0 3230)5 0.100 14 5250401 0.0 14 3250001 -00. 0 5250002 0. 14 3250801 4.00-4 0.010 14

5250001 0.0 0.4 0

52S0002 0.2 0.2 10

523000) 0.0 0.0 13 5251001 00000 0

00 1. 1.

.00 1. 1.

0. 5

5251002 01000 14 5251101 000000 13 52S1201 000 5.00506 0.746105 2507.4303 0.0 0. 1 3251202 000 5.04564 0.7461a5 2557.4315 0.0 0. 1 525130) 000 5.04506 0.7401.5 2597.43.3 0.0 0. 5 3231204 000 5.04530 0.7401.3 2597.43.o 0.0 0. T

5251205 000 5.045.0 0.7441.5 2507.43.3 0.0 0. 14 S251301 0.0 0.0 0.0 13

* sit tank junoct. 5300000 Lo.61 onol jua

5300101 525010000 540000000 2.50-4 0.1 0.1 000000 S300201 0 0.000 0.000 0.500

- so tube aztornal to the tank

5400000 l.tubal pipe 5400001 27

5400101 2.5446-4 27 5400301 0.35 2 5400303 0.472 23

3400)03 0.4 23 5400304 0.) 24

5400305 0.35 27

5400401 0.0 27

5400401 0. 2 5400402 -00. 22 5400003 0. 23 5400004 -00. 24

5400005 0. 27 5400001 4.0..0 0.010 27

5400001 0.0 0.0 2 5400002 0.2 0.2 s 5400003 0.0 0.0 21 5400504 0.3 0.3 22

5400005 0.0 0.0 20 3401001 01000 2 S401002 00000 22 5401003 01000 23 5401004 00000 24

5401005 01000 27 5401101 000000 20 S401201 000 5.045.4 0.7461.5 2507.43)3 0.0 0. 27 5401301 0.0 0.0 0.0 20

• vlv itheot

5500000 vlv.tcb valve

5500101 540010000 111000000 0.040-4 300. 1.o0 000100 1.

1. 1. 5500201 0 0.000 0.000 0.000

5300300 trpvlv 5500301 0)1

: to tank bell

5510000 Lcta.bl branch 5310001 3 0

5510101 0.70. 0.07175 0. 0. 00. 0.07875 4.e-S 1.6.-)

00000

5510200 000 1.07.5 0.748805 3342.43.3 0.0 5511101 S31010000 552000000 0. 0. 0. 000000

3512101 551010000 503000000 0.1 0.1 0. 000000 5513101 551010000 504000000 0.1 0.1 0. 000000 5511201 0. 0. 0.

5513201 0. 0. 0.

5513201 0. 0. 0.

* Io tank bot2 Internal part

5520000 icta.b2 branch 5520001 1 0 5520101 0.1 0.07075 0. 0. 10. 0.0707 4.e*-S 1.$0-$ 00000

5520200 000 1.07.5 0.740805 3342.43). 0.0

5521101 552010000 540000000 0. 0. 0. 400000

5521201 0. 0. 0.

t i0-tonk Internal part (with bWtElI)

5300000 lo.tonk pipe 5600001 12

5000101 0.1 7 5000102 0.0531

5000103 0.007 12

5400301 0.0797S 0 5600302 0.1 a 5000303 0.0632 12 3400401 0.0 12

$400401 90. 12 3000001 4.00-4 1.000 12

5600001 0.0 0.0 11 5601001 00000 12 5001101 000000 11 5401201 000 1.07.5 0.74&8oS 3383.43.3 0.0 0. 2 5001202 000 1.07o5 0.7488.5 3383.43.3 0.0 0. 4

5001203 000 1.07.5 0.7480.5 3383.43.3 0.0 0. 0

5001204 000 1.07.5 0.744065 3)32.43.3 0.0 4. 4 5001205 000 1.07.5 0.740805 3382.43e3 0.0 0. 10

5301200 000 1.07.5 0.1408.5 3)32.4)0) 0.0 0. 12

5401301 0.0 0.0 0.0 11

• Ic tank topl 5010000 1ota.tl brancb

5410001 1 0 5010101 0.087 0.0032 0. G. O0. 0.0632 4.e-5 1.0o-)

00000

5410240 000 1.007S 0.7488.5 3342.43.3 0.0

5011101 560010000 501000000 1. 0. 0. 000000

5011201 0. 0. 0.

: 1o tank tMop

5620000 Icta.t2 branch 5020001 3 0

1.06-5

.0

000000

000000

A5-6
S$20101 *.45, 0.1 0. 0. 00. 00000

5420200 000 1.07.5 0.740805

521101 501010000 S$3000000 0.

5422101 540000000 543010000 0.1

5423101 542000000 544010000 0.1

5421201 0. 0. 0.

5422201 0. 0. 0.

5422201 0. 0. 0.

0.1 6.0-S 1.0.-3

2342.4).) 0.0

0. 0. 000000

0.1 0. 000000

0.1 0. 000000

5801201 000 1.07.5 0.7408.5 2S04..3 0.0 0. 1

5001202 000 1.07s5 0.74085 2504.e3 0.0 0. 2

5001303 000 1.07.5 425.5.3 2504.03 0.5 0. 3

5001204 000 1.0705 425.S53 2504..3 1.0 0. 5

5001301 0.0 0.0 0.0 4

0top esurgelins- tank to

5050000 Icceasj oagjun

5050101 500000000 S62010000 0.1 0.1 0.1 000000

5050201 0 0.000 0.000 0.000

I io-tank longer 1zt. piping

5430000 loft..pt pipe 5430001 22

5030101 2.240.-S 22

5430301 0.11 4

5430302 0.07075 11

5430303 0.1 13

5530304 0.0032 10

5203005 0.11 22

5630401 0.0 22

5430401 0. 4

5430602 0 0. 1i

5030403 0. 32

5430001 4.00-4 0.000 22

5430001 0.0 0.0 3

5430902 0.1 0.1 4

5430003 0.0 0.0 17

5430004 0.1 0.1 10

5430005 0.0 0.0 21

5431001 00000 22

5431101 000000 21

S431201 000 1.07.5 0.7408.5 3)82.43.3

5431202 000 1.07.5 0.740805 33)2.43.3

5431203 000 1.07.5 0.748805 3)82.43.3

5431204 000 1.07.5 0.7400.5 33)2.43.3

54)1205 000 1.07.5 0.740805 3232.43.3

5031204 000 1.07.5 0.7468e5 3320.43*3

5031301 0.0 0.0 0.0 21

* Io-tank short art. piping

5440000 Xc.te.p2 pipe

5040001 22

5640101 2.248.-3 22

5440301 0.03 4

5640302 0.07875 11

5440303 0.1 13

5640304 0.0432 18

5440305 0.03 22

5440401 0.0 22

5440401 0. 4

540402 00. 10

5440403 0. 22

5440801 4.0.-S 0.000 22

5440001 0.0 0.0 3

S440002 0.1 0.1 4

5040903 0.0 0.0 17

5640004 0.1 0.1 10

5440005 0.0 0.0 21

5441001 00000 22

5441101 000000 21 5441201 000 1.07.5 0.748805 3362.43.3

5441202 000 1.07.5 0.748085 3)02.43*.

544120) 000 1.07e5 0.740685 3302.43e3

5441204 000 1.07.5 0.748805 3302.43.3

5441205 000 1.07o5 0.7400.5 3382.43.3

5641204 000 1.07.5 0.7400.5 3332.43e3

5041301 0.0 0.0 0.0 21

- Ic tank bot2 external part

4520000 Icta.b2 branch

0520001 2 0

4520101 0.000 0.07075 0. 0. 00.

00000

4520200 000 1.07.5 0.7480.5

4521101 452010000 440000000 0.

4522101 551010000 452000000 0.

4521201 0. 0. 0.

0522201 0. 0. 0.

0.07075 A.e-S 1.6e-3

1342.43.3 0.0

0. 0. 000000 0. 0. 000000

0.0

0.0

0.0

0.0

0.0

0.0

0.

0.

0.

0.

0.

0.

2

4

0

1022

• Ic-tank external part (with baffle)

40000000 ia.tan pip.

4400001 12

4400101 0.400 12

4000301 0.07075 6

6600302 0.1 0

4600303 0.0432 12

6400401 0.0 12

6400001 00. 12

4000001 4.0ooi 1.000 12

4400001 0.0 0.0 11

0001001 00000 12

4401101 000000 11

6401201 000 1.07.5 0.740845 3382.43.3

4601202 000 1.07.5 0.740865 3302.43.3

6601203 000 1.07.5 0.748085 3382.43e3

4001204 000 1.07.5 0.7400.5 3302.43.)

401205 000 1.07.5 0.7400.5 332:.43.3

4601204 000 1.07.5 0.7480.5 33)2.43.3

64012301 0.0 0.0 0.0 11

0.0

0.0 0.0

0.0

0.0

0.0

0.

0.

0.

0.

0.

0.

2

4

4

0

10

12

• 1o tank topi external

4410000 lota.tI. branch

4410001 2 0

0410101 0.4008 0.0632 0. 0. 0.

00000

6410200 000 1.07e5 0.7400.5

4611101 6041010000 542000000 0.

6012101 440010000 411000000 0.

6011201 0. 0. 0.

4612201 0. 0. 0.

0.0432 4.o-5 1.4.-3

3342.43o3 0.0

0. 0. 000000

0. 0. 000000

0.0

0.0

0.0

0.0

0.0

0.0

0.

0.

0.

0.

0.

0.

4

0

22

s tructures

- lower plenum bottom flange

11001000 1 5 1 1 0.0

11001100 0 1

11001101 4 0.073

11001201 1 4 11001301 0.0 4

11001400 0 11001401 551.0 5

11001501 100010000 0 1 1 0.011 1

11001401 000000000 0 0 1 0.011 1

11001701 0 0.0 0.0 0.0 1

11001001 0. 100. lee. 0. 0. 0. 0. 1. 1

* top of 54SO000

5450101

5450200

5650201

545)202

Io tank

outtlo tadpvol 0. 10. 100. 0. 0. 0. 4.0-S 0. 60000

000 0. 1.5 03224. 2.SQiOeO 1.

1.04 1..5 03224. 2.50004.4 1.

a top 1c - tmdpvo1 atmo.feora

5040000 Icoctop ongljun

5440101 S70010000 545000000 0.1 0.1

5440201 0 0.000 0.000 0.000

• top of to tank 5700000 lcctop pipe

S700001 3

5700101 1.00 3

5700301 0.2 3

5700401 0.0 3

5700601 00. 3

5700001 4.0.-4 0.0 3

5700001 0.0 0.0 2

5701001 00000 3

5701101 000000 2

5701201 000 1.07e5 425.05e3 2504.22e3

5701301 0.0 0.0 0.0 2

* top 10 - ourgeline

5750000 Lac0e4 ongijun

5750101 570000000 500010000 0.1 0.1

5750201 0 0.000 0.000 0.000

• otrgo line de1 to

5000000 iccotop pipe

5000001 5

5800101 0.1 5

5800301 0.2 S

5000401 0.0 S

5000401 00. 5

5900601 4.00e- 0.0 5

5000001 0.0 0.0 4

5001001 00000 5

5801101 000000 4

0.1 000000

* thick flange In varlous zones 11002000 0 10 2 1 0.050

11002100 0 1 11002101 0 0.1075

11002201 1 9

11002301 0.0 9

11002401 S51.0 10 11002501 100010000 0 1

11002502 130010000 0 1

11002503 110040000 0 1

11002504 210010000 0 1

11002505 235010000 0 1

11002500 245010000 0 1

11002507 225010000 0 1

11002500 220020000 0 1

11002401 000000000 0 0

11002701 0 0.0

11002001 0. 100. 100. 0. 0. 0.

1 0.000

1 0.000

1 0.000 1 0.080

1 0.080

1 0.080

1 0.080

1 0.000

1 0.080

0.0 0.0 0. 1. 0

1

2

S

1.0 0. 3

0.1 000000

* added structure for n2 beat losses 11003000 1 10 1 1 0.050

11003100 0 1 11003101 0 0.040

11003201 1 0

11003301 0.0 0 11003401 551.0 10

11003501 130010000 0 1 1 0.100 1

11003401 000000000 0 2002 1 0.100 1

11003701 0 0.0 0.0 0.0 1

11003801 0. 100. 100. 0. 1. 0. 0. 1. 1

cor, c region cylindrical vessel

11103000 30 5 2 1 0.0545

11103100 0 1

11103101 4 0.07045

11103201 1 4

11163301 0.0 4

A5-7
111i4s1& 11103501

1110 3561

11103503

11103504

11103505

11163504 11103567

11103507

1113500•

11103510 11103 511

11103512

11163513

11103514

11163515

11103516

11103601

11103602

11103403

11103604

11143445

11103606

11103607

11103606

11103600

11103610

11103611

11103612

11103613

11105414

11103615

11103461

11103617

11103610

11103610

11103620

11103621

11103622

11103423

11103424

11103425

11103626

11103627

11101326

11103420

11103630

11103631

11103632

11103633

11103634

11103635

11101634

11103637

11103634

11103630

11103701

551.0

166010006

110610006 111010•000

115010400

126010066

130610000

370010000

34001000•

205010008

210610000

220010600

225010000

230010006

235010000

240010000

245610000

600000000

-601

-801

-601

-6011

-601 -001 *001

00 00 00011 -601

-801

-601 -601

-601

-801 -801

000000040

000000006

000000006

400000600

600000000

-801

-001

-601

-601

-801

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-501

4400•000041

-5411

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-801

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-601 -601044

00a 60

S

0 1 10000 1 1000000 

1

0 1 10000 1 0 1

10000 1 a 1 0 1

0 1 10000 1 0 1

10000 1 0 1

16000 I 0- 1

0 0

00000 3504 00000 3504

0000 3504

00000 3504 00000 3504

00000 3504 00006 3504

o 3504

00000 3504

00000 3504 0 •

of000 3500 • 0000 35'05

O000o 3500

00000 3500 400006 3500

00000 3500

00000 3505

0 0 0 0 0 6

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00000 3501 O00c0e 501

00000 3501 00000 3501

00000 3501 00000 3501

00000 3501 00000 3501 0 1

00000 3506

00000 3504 00000 3506

00000 3506 0 0

0.0

0.320

0.144

0.16

0.170

0.200

0.170

O.530

0.625

0.220

0.220

0.314

0.290

0.460

0.160

0.250

0.365

0.220

0.144

0.144

6.144

40.144

0.144

0.160

0.160

0.170

0.200

0.300

0.170

0.53o

4.534

0.530

0.530

0.530

0.530

0.530

0.429

6.220

9.220

0.214

0.214

0.260

0.460

0.440

0.460

0.469

0.449

0.469

0.460

0.460

0.164

0.250

0.250

O.2SO

0.250

0.365

0.0

12I0

11

1210

20

21

22

24

25

33

34

30

39234S76

11

12

13

14

15

14

17

1i

15

20

21

22

23

24

25

26

27

28

20

30

31

32

33

34

35

36

37

38

39

3,

11301611

11201411

11301412

11261613

11301614

11201615

11201816

11201617

11201418

11201619

11201620

11201121

11301622

11301423

11201624

11201625

11201626

11201627

1120163S

11201629

11201630

11201431

11201432

11201631

11201634

11201635

11201701

11201801

*bottom

11405000

11405100

11405101

11405201

11405301

11405401

11405501

11405502

11405601

11405701

11405001

a000000s6 

0 040000066 0

000000000 0 000000000 0 000000000 0 000O80000 0

904000080 0 000000000 0 00000000 0 006004400 0

000000000 0 000000000 0

000000000 .

000000000 0

604600000 000000000 0

000000000 0 000600006O 0 000000006 0 6500000000 •

000000000 a 000000000 0 O000000000 0

0400000000 0

0

0. 100. 100.

2301 1 2901 1 2901 1 2001 1

2901 1 2001 1 2901 1 2601 1

2001 1 2001 1

2001 1 2091 1

2001 1 2001 1

2061 1 2001 1

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0 1

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0.0 0.0

0. 0. 0. 0.

4.313

0.213

0.213

0.213

6.213

0.213

0.213

0.213

0.213

0.2

0.235

0.235

0.235

0.235

0.235

0.235

0.235

0.235

0.235

0.235

0.20

0.17

0.17

0.17

0.17

0.17

0.0

1. 35

10

11

12

13

14

is

16

17

Is

10

20

21

22

23

24

25

26

27

20

29

30

31

32

33

34

35

35

of heoter rods 2 5 2 10

0 1

a 0.132

1 0 0.0 8

551.0 0 135010000 0

140010000 0 000000000 0 0

0. 100. 100. 0.

.0311 110

0.l 0. 0

III

I111II1II11

0.0

- guide tube 11561000 S 5 2 1 0.037

11501100 0 1

11501101 4 0.04

11501201 1 4

11501301 0.0 4 11501401 561.0 

5

11501501 150010000 10000 1 11501$01 000000000 0 0

11501701 0 0.0 11501011 0. 100. 100. 0. 0. 

0

1 0.2

1 0.2 1 0.2 0 0.0 0.0 0. 1. 2

1 0.243 5 1 0.243 5 0.0 0.0 5

0. 1. 5

2222

* core bypase flanges (In guide tubes)

11502000 3 5 3 1 0.037 11502100 0 1

11103801 0. 100. 100. 0. 0. 0. 0. 1. 30

Sore bypass oylindrical 11201006 35 5 2 1 

0 11201100 0 1 11201101 4 0.02106

11201201 1 4 11201301 0.0 4

11201401 551.0 S 11201501 145010000 0 11201503 145020000 0 11201503 145030006 0

11201504 145040006 0

11201505 145050006 0 11201504 145040000 6

11201517 145070000 0 11201500 155010000 0

112015•0 140010000 5

11201510 140020000 0 11201511 140030000 0

11201512 160040000 0 11201513 140050000 0

11201514 160040000 0 11201515 160070000 0 11201516 140086000 0

11201517 16000600 0 11201516 160100600 0

11201510 165010000 0 11201520 170010000 0

11201521 170020000 0

11201522 170030004 0

11201523 170040000 0

11261524 170050004 1 11201525 170060000 6 11201526 170070000 0

11201527 170088000 0 11201528 17000000 0

11201520 170100000 0

11201530 175010000 0 11201531 100010000 0 11201532 180020000 0 11201533 180030006 0

11201534 160040000 0 11201535 160050444 0 11211601 000000000 0

11201662 00006000o 6 11201403 000000000

11201604 400000000 0 11301405 404100000 0

11201600 000000000 0

11201607 00000000 0 11201600 000006000 0

11201600 100010000 0

.01623

11563101 4 0.146 11502261 1 4

11502301 0.O 4 11502401 561.0 

5 11502501 150010000 0 11502502 150030000 0 11502503 150050000 0

11502601 000000000 0

11502701 0 11502601 0. 100. 100. 0.

1 1 1 1

I I

0 1 0.0 0.0

0. 0. 0.

0.100

0.100

0.109

0.109

0.0

1. 3

12S33

11111111I1I1II1I111II1I

0.2 1 0.2 2 0.169 3

0.169 4

0.100 S 0.160 6

0.10, 7 0.213 6

0.213 % 0.213 10

0.213 11

0.313 12

0.313 13

0.213 14

0.213 15 0.213 16

0.213 17 0.213 1i

0.2 10 0.235 20 0.235 21

0.235 22

0.235 23

0.2135 24 0.235 25 0.235 20

0.235 37 0.235 28

0.235 23

0.20 30

0.17 31 0.17 32 0.17 33

0.17 34 0.17 35

0.2 1

6.2 2 0.180 3

0.189 6

0.180 5 0.180 6

0.180 7 0.213 6 0.213 6

• fuel boz wall

11601000 16 5 1 1 0.0

11601106 0 1 116611o0 4 0.003

11601201 1 4 11611301 0.0 4

11601401 541.0 S 11401501 200010000 10000

11801401 370010000 0 11601602 370010000 0 11601403 370020000 0 11601604 370020000 0 11601605 370030000 0

11601606 370030000 0

11601607 370040004 0 11601608 370040000 0

11601600 370050000 0 11601410 370050000 0

11601611 370040000 0 11601412 370040000 0

11601613 370070000 6

11401414 370070000 0

11401615 360010000 0

11401616 360010000 0

11601701 0 11601801 0. 100. 100. 0. 0.

11601901 0. 100. 100. 0. 0.

L1I1II1I1I

0.0

0. 0. 0. 0.

11III1I1I11111111

,00

1. 10 1. 16

0.07632

0.07632

0.07632

6.07632

0.07632

0.07632

0.07633

0.07632

0.07632

0.07032

0.07432

0. 076132 0.07632

0.07632

0.07432

0.07232

0.07632

0.0

16124S567a

10

11

12

13

14

15

16

16

I I I I 1 1

I I 1 1

I I I I

1 1 1 1 1 1

1 1

I I

0 1

0 1 0 1

6 1

0 1 0 1

0 1 2001 1 2001 1

• bottom

11651000 116511400

11651101

11051192

11651103

11451104 11651105

11451166

11651201

11451202

11651203

11651204

11651205

unheated length

2 10 3 1 0.0 6 1

3 0.0030

1 0.0025

1 0.0035 1 0.0043

1 0.0050

2 0.006115 2 3

3 4

4 S

5 6 4 7

A5-8
115S1200 5 9

11651301 0.0 0

11051401 541.0 s0

11051501 000000000 0 0 1

11051503 000000000 0 0 1

11651641 140010000 0 1 1

11051002 135010000 0 1 1

11451701 0 0.0 0.0

11451001 0. 100. 10e. 0. 0. 0. 0. 1. 2

* core activ tlenrth

12001000 14 10 2 1 0.0

12001100 0 1

12001101 3 0.0020

12001103 1 0.002S

12001103 1 0.0035

12001104 1 0.0043

12001105 1 0.0050

12001100 2 0.000115

121001201 2 3

12001203 2 4

12001203 4 S

12001204 S 0

12001205 4 7

12001200 5 9

12001301 0.04 3

12001302 0.0 S

12001303 0.00 0

12001304 0.0 0

12001401 541.0 10

12001501 OOO000000 0 0 1

12001001 240014000 1ese0 1 1

12001701 000 0.041724 o.0

12001702 900 0.051724 0.0

12001703 000 0.040804SS 0.0

12001704 000 0.0004695 0.0

1200170S 000 0.084483 0.0

12001700 000 0.084493 0.0

12001707 000 0.0600S5 0.0

12001708 too 0.040055 0.0

12001700 000 0.004403 0.0

12001710 900 0.004403 0.0

12001711 000 0.0489055 0.0

12001712 900 0.0080455 0.0

12001713 000 0.051724 0.0

12001714 900 0.051724 0.0

12001001 0. 100. 100. 0. 0. 0.

12001902 O. 100. 100. 0.13 0. 0.

12001903 $. 100. 100. 0. 0.13 0.

12001004 0. 100. 100. 0.13 0. p.

12001005 0. 100. 100. 0. 0.13 0.

12001900 0. 100. 100. 0.13 0. 0.

12001007 0. 100. 100. 0. 0.13 0.

12001108 0. 100. 100. 0.13 0. 0.

13001900 0. 100. 100. 0. 0.13 0.

13001010 0. 100. 100. 0.13 0. 0.

12001911 0. 100. 100. 0. 0.13 0.

12001913 0.10e. 100. 0.13 0. 0.

12001012 0. 100. 100. 0. O.13 0.

12001014 0. I0*. 100. 0. 0. 0.

3.2

1.0

3.2

1.9

O.O

O.

O.

O.

O.

O.

0.

0.

0.

0.

0.

0.

0.

0.

0.

1

2

1

2

2

4.04 0.24

0.0

0.0 0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0 0.0

0.0

0.0

0.0

0.0

1.

1.

1.

1.

1.

1.

1.

1.

1.

1.

1.

1.

12202002 225010000 0 1 1 0.1lls 2 12202003 230010000 0 1 1 0.043 3

12202404 230010000 0 1 1 0.2345 4

12303405 230010000 0 1 1 0.23sa 5

13302000 33002000 0 1 1 0.2345 0

12202007 330020000 0 1 1 0.2345 7

13220200 230030000 0 1 1 0.234S a

12203000 230030000 0 1 1 9.234S 0

12202010 310040000 0 1 1 0.2345 10

1220211 230040000 0 1 1 0.2345 11 12203012 2300s0000 1 1 0.2345 12

13203013 230050000 0 1 1 0.2345 13

13203014 230060000 0 1 1 0.2345 14

12202015 230000000 0 1 1 0.2345 1s

12203010 230070000 0 1 1 0.234S 10

12302017 230070000 0 1 1 0.334S 17

1220216 2300000000 0 1 1 0.2345 1t

12202410 230080000 0 1 1 0.2345 10

12303701 0 0.0 0.0 0.0 10

12303201 0. 10. 100. 0. O. 0. 0. 1. 10

12202901 0. 100. 100. 0. O. 0. 0. 1. 10

14

14

1

2

3

9

0

0

7 8

10

11

12

13

14 I

2

3

4

S

0

7

6

0

10

11

12

13

14

a 04 borisontal pipes

12501000 10 5 2 1 0.0366 12501100 0 1

12501101 4 0.047

12501301 1 4

13201301 0.0 4

12501401 S01. S

12501501 250010000 lo00 1

12501502 255010000 10000 1

12S01001 00W000000 0 0

12561701 0 o.0

12501001 0. 100. 100. 0. 0. 0. 0.

* 04 horizontal pipes flanges

12502000 5 S 2 1 0.0300

12502100 0 1

12503101 4 0.1335

12502201 1 4

12502301 0.0 4

12502401 501. 5

12502501 2S0010000 0 1

12002502 250050000 0 1

12502503 255010000 0 1

12502504 255030000 0 1

12032505 2550S0000 0 1

12502001 000000000 0 0

12502701 0 0.0

12502801 0. 100. 100. 0. 0. 0. O.

1 0.270 1 0.279

1 0.270

0.0 0.0 1. 10

S10

10

10

a top unheated lengrth

12002000 2 10 2 1 0.0

12002100 2001

12002401 501. 10

12002501 000000000 0 0

12002502 000000000 0 0

12002001 200150000 0 1

12002002 300100000 0 1

12002701 0 0.0

12002901 1. 100. 100. 0. 0. 0. 0.

1

1

I

1

0.0

1. 2

3.004 1 3.3 2

3.044 1

3.2 2

0.0 2

* upper tic plate

12051000 1 S 1 1 0.0

12051100 0 1

12051101 4 0.015 12051201 1 4 120S1301 0.0 4

12051400 0

12051401 541.0 5

12051501 200100000 0 1 1 0.860o-3

12051401 205010000 0 1 1 0.0800-3

12051701 0 0.0 0.0 0.0 1

12051001 0. 100. 100. 0. 0. 0. 0. 1.

12051901 0. 100. 100. 0. 0. 0. 0. 1.

• separator walls - flange

12201000 1 S 2 1 0.02745

12201100 a 1

12201101 4 0.1075

12201201 1 4

12201301 0.0 4

12201401 51. 5

12201501 220030000 0 1 1

12301001 000000000 0 0 1

12201701 0 0.0 0.0

12201801 0. 100. 100. 0. 0. 0. 0. 1.

aod ma ud pipe 12001000 17 S 2 1 0.0427

12001100 0 1

12001101 4 0.0508

12001201 1 4

12401301 0.0 4

12001401 501. S

12001501 200010000 10000 1

12001502 206010000 0000 1

12001503 270010000 00000 1

12001504 275010000 10000 1

1240150S 280010000 00000 1

12001500 285010000 10000 1

12001001 o00000000 00000 0

12001002 000000000 000o0 0

12001003 000000000 00000 0

12001404 000000000 00000 0

12401405 000000000 00000 0

12001000 .801 O0000 3501

13001701 0 0.O

12001001 0. 100. 1M0. 0. 0. 0.

* dc flanges

12402000 10 S 2 1 0.0427

12002100 0 1

12002101 4 0.140

12002201 1 4

12002301 0.0 4

12002401 501. S

12002501 200010000 0 1

12002502 200010000 0 1

12002503 205010000 1 1

12002504 270010000 0 1

12002505 28500000 0 1

12002504 300010000 0 1

12002507 310010000 0 1

12002500 320150000 0 1

12402500 325010000 0 1

12002510 330010000 0 1

12002001 400000000 0 0

12402701 0 0.0

13002801 0. 100. 100. 0. 0. 0.

0 oan-do conneotion

12001000 4 S 2 1 0.02

13001100 0 1

12901101 4 0.0211

13401201 1 4

13901301 0.0 4

13901401 501. 5

12001501 200010000 10O00 1

12001502 295010000 10000 1

12001001 000000000 0 0

12901402 000000000 1 0

12301003 000000000 0 0

12001004 000000000 0 0

12901701 0 0.0

12901801 0. 100. too. 0. 0. 0.

0.

0.

1.

I

I

I

I

1

1

I

I

I

1

1

1

1.

1

1

I.

1

1

I

1

1

1.

.109 0.109

.109

.109

.109

O.100

o.o

0.25 4 0.240 5 0.247 0

0.302 10 0.3 11

0.3 17 0.2S 4

0.200 S

0.247 0

0.302 10

0.3 11

0.3 17

0.0 17

7

I

3

3

4

S

Ss

I

1

1

1

4.06

0.00

0.08

0.00

0.08

0.08

0.00

0.08

0.06

0.00

10

0.080 1 0.006 1 0.0 1

1

a separator wall

12202000 19 5 2 1 0.02740

12202100 0 1

12202101 4 0.03015

12202201 1 a

12202301 0.0 4

12202401 Sol. 5

13203S01 230030000 00000 1

12202502 320040000 00000 1

12202503 220040000 0000 1

13202504 220050000 10000 1

12202001 220010000 0 1

0.

1 0.2

1 0.35

1* 0.3

1 0.3

1 0.25

1 0.35

0.0 0.0

1. 4

1

2

3

4

S

0

7

0

0

10

10

10

3

4

1

2

3

0 I 4

0.234S 1 0.1015 3

0.043 3

0.2345 10

6.2345 1

A5-9
- sea-do aeomwction ftlae-4 12902000 4 5 a 1 0.02

12902108 0 1 12902101 4 0.0595

12902201 1 4 12902301 0.0 4 13902401 561. 5 12902501 290010000 0000 1 1 0.

12903502 295010000 10000 1 1 , 12902001 oeoOO0000 0 O 1 0. 13002602 000000000 0 0 1 0.

12902603 000000000 0 0 1 0,

12902404 000000000 0 0 1 0.

13902701 0 8.0 0.0 0.

129020801 0. 100. 100. 0. 0. 0. 0. 1. 4

- lovet downcomec 13001000 24 5 2 1 0.0300 13001100 0 1

13001101 4 0.0445

13001201 1 4 13001301 0.0 4 13001401 551.0 S 13001501 300010000 0 1 1 0. 13001502 305010000 10000 1 1 0.

13001503 310010000 e 1 1 0, 13001504 320010000 10000 1 1 0,

13001505 325010000 0 1 1 0 13001500 330010000 0 1 1 0. 13001401 000000000 0 0 1 0 13001402 -801 00000 3503 1 0. 13001003 000000000 0 0 1 0,

13001604 000000000 00000 0 1 O, 13001605 000000000 0 0 1 0 13001606 000000000 0 0 1 0 13001701 0 0.0 0.0 0 13001801 0. 100. 100. 0. 0. 0. 0. 1. 30

• lot pump 13151000 1S 5 2 1 0.0133 13151100 0 1 13151101 4 0.0147

13%51201 1 4 13151031 0.0 4 13151401 551.0 S 13151501 315010000 10000 1 1 0 13151502 315150000 0 1 1 0. 1315101 320010000 10000 1 1 0 13151002 320150000 0 1 1 0

13151701 0 0.0 0.0 0. 13151001 0. 100. 100. 0. 0. 0. 0. 1. Is 13151001 0. 100. I00. 0. 0. 0. 0. 1. 15

* lower plenum hoc 13351000 7 S 2 1 0.0344

13351100 0 1 13351101 4 0.028 11351201 1 4 13351301 0.0 4 13351401 551.0 5 13351501 335010000 10000 1 1 0 13351502 345010000 10000 1 1 0

13351401 000000000 0 0 1 0 13351602 000000000 0 0 1 0 13351701 0 0.0 0.0 0 13351001 0. 100. 100. 0. 0. 0. 0. 1. 7

• Ip hot flanges

13352000 3 5 2 1 0.0244

13352100 0 1 13352101 4 0.1335

M1U3301 1 4 13352301 0.0 4 13352401 5S5.0 S

13352501 335010000 0 1 1 0 13353202 335046000 0 1 1 0 13352503 345010000 0 1 1 0

13352401 000000000 0 0 1 0 13352701 0 0.0 0.0 0 13352801 0. 100. 100. 0. 0. 0. 0. 1. 1

: lp pipe

13353000 2 5 2 1 0.01905 13353100 0 1

13353101 4 0.02413

133S3201 1 4 13353301 0.0 4 13353401 551.0 S 1353501 345040000 10000 1 1 0 13353001 110020000 -10000 1 1 0 13353701 0 0.0 0.0 0

13353801 0. 100. 100. 0. 0. 0. 0. 1. 2

13353901 0. 100. 100. 0. 0. 0. 0. 1. 3

• to pipe external 11000000 t0 5 2 1 0.009 15000100 0 1

15000101 4 0.010 * 0.013

15000201 1 4

15000301 0.0 4

15000401 551.0 5 15000501 500010000 10000 1 1 6 15000502 500000000 10000 1 1 0 15000503 500100000 00000 I 1a

15000601 -401 00000 2507 15000002 -001 00000 3507 15000603 -001 00000 3507 15000604 -001 00000 3501

1M00005 -001 00000 $357 15000000 -001 00000 3507

.0?0

.070

.070

.070

.070

.0

3

4

1

4

4

.275 1 328 9 .24 10 .327 24

.27 2s .27 20 .215 1

241 9 .20 10 .21S 24

.2? 25 .27 2a .0 20

.373

.1

.213

.1

.0

14

is

14

is

is

15000007 15000600 1500040S

15400410

15000701

15000801

- to exit 15010000 15410104

15010101

15010201

15010301

15010401

15010501

15010502

15010505

15010504

15010505

15010001

15010003

150100031

15010004

15010405

15010400

15010007/

15010000

15010701

15010401

• 1. pipe

15100000

15100100

15100101

15100201

15100301

151o0001

151005o1

15100502

15100001

15100002

15100701

15100001

15100901

• IC heat

15150000

15150100

15150101

15150201

15150301

15150401

15150501

15150001

15150402

15150403

15150004

15150405

15150701

15150001

15150001

* Io beat

15250000

15250100

15250101

15250201

15250301

15250401

15250501

15250502

15250503

15250001

15250002

15250400

13525004

15250005

15250006

152501007

15250000

15250009

15250102

15250701

15250801

15250001

• 10 tenk 156000000

15600100

15000101

15400201

15000301

15600401

15600501

15000302

15600503

15600504

15400505

15000500

15600507/

15000001

15000002

151000603

15400404

154000605

150004000

15400010,

150600106

15100100

15000010

-041 4000o 3507 1 0.21 -801 O0000 3507 1 0.21 -301 00900 30§7 1 0.21 -811 00000 3501 1 0.11. 1 0.0 0.0 0.0 1t . 10. 10e. 0. 0. 0. 0. 1. 10

27 5 2 1 0.009

0 1 4 0.010 * 0.013 1 6 0.0 4

551.0 5 540010000 10000 1 1 0.35 2 540030000 100i0 1 1 0.412 22 5402310000 0 1 1 0.4 a2 540240000 0 1 1 0.3 24

540250044 10000 1 1 0.3S 27 000000000 00000 0 1 0.25 1 000000000 00000 0 1 0.35 2 -801 00000 3504 1 0.472 22 000000000 00000 O 1 0.4 23

000000000 00000 0 1 0.3 24 000000000 00000 0 1 0.3S 25 000444040 4,0000 0 1 0.35 24 000000001 00000 0 1 0.35 27

0 0.0 0.0 0.0 21 0. 100. 100. 0. 0. 0. 0. 1. 27

Internal flanges

2 30 2 1 0.095

0 1 30 0.125

1 29 0.0 29 551.0 30

510010000 00000 1 1 0.10 1 520010000 00000 0. 1 0.10 2 502010000 00000 1 1 0.10 1 500080000 00000 1 1 0.10 2 0 0.4 0.0 0.0 2

0. 100. 100. 0. 0. 0. 0. 1. 2 0. 100. 100. 0. 0. 0. 0. 1. 2

exchanger 12 tubes

5 10 2 1 0.00411

0 1 S 40.01094 1 9 0.0 9 551.0 10 515010000 10000 1 1 0.758 5 501010000 00000 1 1 0.758 1 500120000 00000 1 1 0.,758 2 540110000 00000 1 1 0.758 3

500100000 00000 1 1 0.758 4

540000000 00000 1 1 0.758 5

0 0.0 0.0 0.0 S

0. 100. 100. 0. 0. 0. 0. 1. 5

0.005 100. 100. 0. 0. 0. 0. 1. 5

exchanger - bottom exit single tube

14 10 2 1 0.0104 0 1 91 0.0134 1 3

0.0 9 551.0 10

525010000 00000 1 1 0.1 1

525020000 10000 1 1 0.01075 9

525020000 10000 1 1 0.104 14

525000700 00000 1 1 0.1 1 500070000 00000 1 1 0.01075 2

500050000 o0000 1 1 0.07875 2

500040000 00000 1 1 0.0715 4

5$0030000 o0000 1 1 0.07085 5

560030000 00000 1 1 0.07875 5

560010000 0,00 1 1 0.07875 7 $55010000 o0000 1 1 0.7478S 7

S51010000 00000 1 1 0.07875 &

551010000 00000 1 1 0.104 14

0 0.0 0.0 0.0 14 0. 100. 100. 0. 0. 0. 0. 1. 14 0. 100. 100. 0. 0. 0. 0. 1. 14

- to consider heat loee to eanvl.

10 5 2 1 0.4750 0 1

4 0.478 1 4 0.0 4 551.0 5 551010000 00000 1 1 0.0767!

451210000 00000 1 1 0.0707 660010000 10000 1 1 0.0787! 660070000 10000 1 1 0.1

060090000 10000 1 1 0.0032

401010000 00000 1 1 0.0032

542010400 00000 1 1 0.1 -a1l 0 3505 1 0.0087

-. 01 0 3505 1 0.0087 -801 0 3505 1 0.0787 .- 01 0 3505 1 0.0787 -801 0 3505 1 0.0787

-401 8 3505 1 0.0787

-001 0 350S & 0.07/1

-801 0 3505 1 0.0,76 -801 0 3505 1 0.1 o001 0 3SOS 1 0.1

3 1

2 10

.AS

.12

.2S

.12

.0

4

7

4/

1

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1.1

.5

I

2

S

3

S

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'.25

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2

2

2

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1 0.38

1 0.30 1 0.38

1 0.303

5 1 $2S a

10

1415

14

5 1

52a

53

$5

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9

10

1

2

3

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4

A5-10
15600011 -001 0 3505 1 0.9632 11

15000012 -001 0 350S 1 0.0432 12

15600013 -001 0 351S 1 0.00132 1

15600614 -001 0 3505 1 0.0632 16

1S564015 -801 0 3505 1 80.432 1s

15600016 -001 0 3S0S 1 0.1 16

1S600701 0 0.0 0.0 0.0 16

15600401 0. 1i0. Leo. 0. 0. 0. 0. 1. 16

i I2 tank external pipes - for beat ises..

15304000 22 5 2 1 6.0262S

15430100 0 1

15630101 4 4.0295

15630201 1 4

15030301 0.0 4

1S630001 551.0 S

IS630501 563014660 10000 1 1 0.11 6

15030502 503050000 10000 1 1 0.07875 11

15430503 563120000 10000 1 1 0.1 13

1S530504 563164000 10000 1 1 0.0633 Is

15030s05 031940000 10000 1 1 0.11 22

15630601 .001 0 350& 1 0.11 4

15630602 -801 0 3506 1 0.0707S 11

15630603 .-01 0 3506 1 0.1 13

15630604 -801 0 3508 1 0.0632 is

15630405 -001 0 3500 1 0.11 22

15630701 0 0.0 0.0 0.0 22

15430601 0. 100. 100. 0. 0. 0. 0. 1. 22

I n. tank external pIp** - for beat l0esee

1S640000 22 S 2 1 0.02425

1S640100 0 1

15640101 4 0.0205

1S640201 1 4

1S640301 0.0 4

16460401 551.0 5

156460501 S4010000 10000 1 1

1S440002 S4050000 10000 1 1

IS440503 S46120000 10000 1 2

15640054 566140000 10000 1 1

15640505 564190000 10000 1 1

1S540601 -601 0 3504 1

15640402 -801 0 3506 1

15640003 -601 0 3506 1

IS640604 -001 0 3506 1

15640605 .001 0 3500 1

15640701 0 0.0 0.0

15640801 0. 100. 100. 0. 0. 0. 0. 1. 22

• In tank Internal baffle

16000000 16 S 2 1 0.3S

16600100 0 1

10600101 4 0.353

14460201 1 4

14600301 0.0 4

14600401 551.0 5

16000501 552010000 00000 1 1

16400502 50010000 10060 1 1

16600S03 560070000 10000 1 1

16600504 500000000 10000 1 1

16000505 501010000 00000 1 1

16400601 652010000 40000 1 1

14600602 0 60010000 10000 1 1

16000003 660070000 10000 1 1

16000604 660900060 10000 1 1

16600005 601010000 00000 & 1

10400701 0 0.0 0.0

16600001 0. 100. 100. 0. 0. 0. 0. 1. 14

14400901 0. 100. 100. 0. 0. 0. 0. 1. 14

0.03 4

0.07075 11

0.1 13

0.0432 10

0.03 22 0.03 4

0.0767S 11

0.1 13

0.0012 10 0.03 22

0.0 22

20100126 1273.0 27.S0"

30100127 1323.0 20.05

20100120 1373.0 28.60

201040129 1423.4 0 .15

20140130 1473.0 29.70

20100131 1523.0 30.2S

20100133 1573.0 16.00 ......................... .... ......... 0 ...................... 0..0.a

• .alore opecitloo doll* ac*laoo

20100151 1.0 3$.529404

20100152 123.0 3.S0240.6

20100153 173.0 5.5264096

20140014 223.0 3.56240.6

20100155 273.0 3.5024904

20100154 2393.0 3.S0249.0

201001S7 323.0 1.4572004

20100108 373.0 3.05704

2030150 423.0 30.9334s0

20100100 473.0 4.1080004

20100101 S23.0 4.21070.0

20100102 573.0 4.234020o

20100163 623.0 4.37020.6

20100104 473.0 4.463004

20100145 723.0 4.5$300.0

301001604 773.0 4.56225e4

30100107 823.0 4.6230416

20100148 073.0 4.604700. 20100160 023.0 4.7518050

20100170 073.0 4.03295.0

20100171 1023.0 4.01360-0

20100172 1073.0 S.033300e

30100173 1123.0 S.10310.6

20100174 1173.0 S.37200e4

20100175 1223.0 5.6011004

20100170 1273.0 5.S010155

20100177 1323.0 0.1420104

20100178 1373.0 0.44245.0

20100170 1423.0 6.72210o0

20100100 1473.0 7.00335.6

20100101 1523.0 7.2638000

20100182 1573.0 7.56425.6

• gonduttlvlta' mat..-2 r.. *

20100201 293.2 306.1

20100203 373.2 374.0

20100203 573.2 344.3

20100204 1000.0 360.1

20100205 2000.0 064.3 *. ......................... p...............

c dor. opec. mat. -2- *

20100251 293.2 3.449

6e4

20100252 373.2 3.544080*

20100253 S73.2 3.7104.0

20100254 1000.0 3.7180

44

20100255 2000.0 3.7164lo a-----------------------------------------

c oondutttvita, mat. -3- ml *

---------------------------- ---------------

20100301 203.2 71.18

20100302 573.2 58.42

20100303 773.2 58.62

20100304 1073.2 48.15

20100305 2000.0 40.15 *-----------------------------------------

galore ap0 . sat. -3- ------------------------------------------

2010351 203.2 4.0S3O4eo

20100352 S73.2 4.05304,:

20100353 773.2 4.05304e0

201003S4 1073.2 4.053040

20100355 2000.0 4.AS304e4

- - - - ----------------------- * conduttlvlt* ma~t. -4- bn-o•

---------------------------------------- a--

20100401 293.0 23.0 20100402 400.0 23.0

20100403 O5.0 22.S

20100404 600.0 22.0

20100405 700.0 21.5

20100404 000.0 20.9

20100407 000.0 20.5

20100400 1000.0 20.1

20100409 1100.0 10.6

20100410 1200.0 19.4

20100411 1300.0 10.1

20100412 2000.0 10.1

* clore Opea.mat. -4- C

20100445 203.0 1.5020o4

20100452 400.0 2.0121e4

20100453 500.0 2.4135e0

20100454 400.0 2.469 e$

30100455 700.0 2.9127e0

20190456 090.0 3.007e6

20100457 000.0 3.260.

20100450 1000.0 3.3972e6

20100459 1100.0 3.4041.4

30100400 1200.0 $.SGI1a0

20101401 1300.0 3.G537e0

20100402 1400.0 3.7123eo

20100463 1500.0 3.75004.

20100404 2000.0 $.750060

-----------------------------------------------------------------

conduttLvLte, sat.-S- 1/000

S. .................... 20100501 234 .3 14.60

0.07075 1

0.0707S 7

4.1 0

0.0032 13 0.0032 14

0.07875 1

0.07875 7

0.1 9 0.0632 13

0.0632 1&

0.0 14

........-----------------------------------

• materiel table.

-------------------------------------------

20100100 tbl/totn I I s "tainless• teel

20100200 tbl/totn 1 1 a copper

20100300 tbl/tgtn 1 1 • nickel

20100400 tblitatn I I a boron nitride

201000SO tbl/tgtn 1 1 * Inc. 600

20100400 tbl/tgtn 1 I filler (oeraaolg)

*--------------------------------------- a--

01 0 onduttlyltel accia

20100101 1.0 15.16 20100102 123.0 15.10

20100103 173.0 15.10

20100104 223.0 15.10

20100105 373.0 15.16

20100100 203.0 15.16

20100107 323.0 15.62

20100100 373.0 10.37

20100100 423.0 17.09

20100110 473.0 17.01

20100111 523.0 10.S0

20100112 573.0 10.30

20100113 623.0 10.95

20100114 473.0 20.50

2010011S 723.0 21.13

20100116 773.0 31.77

20100117 923.0 22.34

20100116 873.0 22.95

20100110 923.0 23.S5

30100120 973.0 24.12

20100121 1023.0 24.46

30100122 1073.0 25.25

20100123 1123.0 25.61

20100124 1173.0 26.38

20100$25 1223.0 26.94

A5-11
20100502 100.5 15.12

20100503 477.0 17.4S 28010504 5a8.$ 10.11

20100505 0699. 20.62 20100500 811.0 22.79 20100507 622.0 24.81

20100508 1033.2 26.03

20100509 1144.3 20.05

20100510 2000.0 20.85

* calor.• Slpe. s1at. -5-

20100551 294.3 3.7429200

20100552 300.5 3.6199500 20100553 477.0 4.0069800

20100884 580.0 4.27400

20100555 400.0 4.451*0

20100884 s11.0 4.001790* 20100557 022.0 4.9390800 20100880 1033.2 5.11701.0

20100559 1144.3 5.20032.0

20100560 2000.0 5.20032s1

* *----- oonduttlvlta" -------------------------------------- mat.-0- ill.

20100001 8109---------------------------------------------------------------a 200.2 0.5)04

20100002 2000.0 0.9304

• osier.s *----------------- pec. sat. -0-6-------------------------------------------a

20100081 204.2 1.-2678.0 20100052 2000.0 1.9297500

--- *----tI--t--de --------------------------------

------------------------- *----------------

* heat removal by cooling call from ad (max 200 kw)/ heat losses

pa-ie-2

20250100 htc-t 507 20280101 -1.0 0.0

20250102 0.0 0.0

20250103 1.0 -1. "15. 20250104 450. -1. -I5. 20250105 481. -4. -15.

20250100 000. -4. *15. 20250107 001. -1. -15. 20250100 1.0l -1. -15.

• heat removal by cooling coll from ude (max 40 kw|/ heat 1losse

po-lo-2

20250200 htc-t 508 20250201 -1.0 0.0 20250202 0.0 0.0 20250203 1.0 -1. -20.

20250200 450. -1. -20. 20250208 451. -15. -20.

20250200 000. -15. -20. 20250207 001. -1. *20. 20250200 2.0 -1. *20.

• heat removal by cooling coll from mdc (max 10 kw) (hete loeses

po-io-2)

20256300 htc-t 509 20250301 -1.0 0.0

20250302 0.0 0.0 20250303 1.0 20. 20250304 1.04 20.

: heat removal by cooling coil from lp Cmax 50 kw)

20250400 hto-t 510

20250401 -1.0 0.0 20250402 0.0 0.0

20250400 1.0 323.

30250404 1.00 323.

: heat losees from Is tank

20250500 htc-t 500

20250501 -1.0 0.0

20250502 0.0 0.0 20250503 1.0 50. 20250504 1.0 50.

: bhat losses from•steam dome top lutilized for po-oad-)

20250000 htc-t 582

20280601 -1.0 0.0 20250002 0.0 0.0 20250603 1.0 00. 202506004 1.$ 00.

• heat looses from Ic line

20250700 htc-t 51

20250701 -1.0 0.0 20250702 0.0 0.0 20250703 1.0 50.

20250704 082. 50.

20250705 1.4e 54.

a beat losese from It tank external pipes & Ic lin liquid

20350800 htc-t 560

20250101 -1.0 0.0 20250802 0.0 0.0

20250003 1.0 so. a

20250804 1.00 50.

a heat losse, from core region (external vessel)

20250900 htc-t S83 20250601 -1.0 0.0

20250002 0.0 0.0 20250003 1.0 5. 2025004 1.0l S.

heat b exchange between ma, udoo "ad and Ip slabs with cooling coil

* - aemigned environment tamperature value -

20280100 toup 511 20280101 -1.0 0.0 20280102 0.0 0.0 20200103 1.0 303. 20200100 1.O 303.

ogre powor

20260000 power S13

20290001 -1.0 0.0

20250002 0.0 0.0 20250003 5.0 0.0410.0

20290004 430.0 0.041O0. 20200050 040.7 0.004o0 202900006 504.1 0.00400 20250007 550. *.07047e0

20290008 590. 0.07330*0 20210000 1000. 0.07330.1 20290010 1088. 0.0

20200011 1.0 0.

• bypass heaters 20290100 htrnrate 515

20290101 -1. 0.00

20250102 0. 0.00

20290103 1.99 0.00 20250100 2.0 -2.05e3 20290105 200. -2.15.3

20290100 201. Gý

20290107 1.06 0.

* power lose from fuel box -lower part- fbI

20250200 htrnrate 510

20290201 -1. 0.00

20210202 0. 0.00

20290203 0.01 5.9004 20200204 30. 5.50e4

202530205 50. 5.00e4

20290200 70. S.90e4

20290207 100. 5.9004

20290208 201. 7.90e4

20290209 202. 7.9004

20290210 400. 10.9004

20290211 1003. 10.50e3

20290212 1.00 10.60.3

a power lose from fuel box -upper part- fb2

20290300 htrn•ate S17

20290301 -1. 0.00

202S0302 0. 0.00

20250303 0.01 0.45003

20210304 100. 0.0O5)

20290305 360. 0.05003

20290300 050. 0.45003

20290307 1002. 5.05004

20260300 1003. 0.45043

20290309 1.04 0.45003

--------- *--------------------------------

* control variables

- - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - -

• do lvI annular partl

20500100 do.lvlI 20500101 0. 0.1

20S00102 0,273 20500103 0.273

20500104 0.273 20500105 0.273

20500100 0.273 20500107 0.273 20500100 0.273

20500106 0.273

20500110 0.273 20500111 0.273

20500112 0.273 20500113 0.273

20500114 0.273

20500115 0.273

* do lvl part 2

20500200 do.v12 20500201 0. 0.325 20500202 0.201

20500203 0.281

20500204 0.201

20500205 0.201

20500204 0.281

20500207 0.20

20500200 0.29

20500209 0.29

20500210 0.283

* do lyl part 3 20500)00 do.1Iv13

20500301 0. 0.300

20500302 0.300 20500303 0.300

20500304 0.300 20500305 0.300

20500300 0,300

20500307 0.300 20500306 0.302

20500305 0.302

sun 1. 0. voidt 326150000

voldf 320140000

vaid! 320150900 void! 320120000

vol4 320110000

voidf 320100000 volda 3200P0000 void! 32000000

vold! 320010000

vold! 320000000

voldf 320050006 vaid! 320040000 voidf 320030000

voidf 320020000 voidf 320010000

DuN

voldf void!

voldf

voldf

voldf void!

voidf

voldf

voaid void!

1. 0. 310010000

305000000

305070000

305060000

305050000

305020000

305030000

300020000 305010000

300010000

sun 1. 0I voidf 205000000 volid 205050000

voLdf 285000000 voidf 280030000

vold! 205020000 voldf 205010000 void! 200010000

voldf 275040000 voidt 275803000

A5-12
7" ̧

20500310

20500311

20500312

0.362

0.362

0.247

voldf 375020000

voldt 275010000

voldt 270010000

* do lvI jet pump region

20500400 do.lvl4

20500401 0. 0.273

20500402 0.273

20500403 0.273

30500404 0.273

20500405 0.273

20500404 0.273

20500407 0.373

20500408 0.273

20500400 0.273

20500410 0.273

20500411 0.273

20500412 0.273

20500413 0.273

20500414 0.273

20500415 0.273

sun

volde

voidt

vold[

voldf

voidf

voildt

voidf

voidt

voidt

voldt

veldt

veldt

voLdf

veidt

voedt

* do lvi total annular region

20501000 dc.lvl.a OuR

20501001 0. 1. ontrivar

20S01002 1. ontrlvar

20501003 1. ontrlvar

20501004 0.244 voldt

20501005 0.25 voldf

20501006 0.25 voldt

20501007 0.25 velrd

20501008 0.25 voldf

* do lvI total Jet pump region

20501100 de.lv.jp sun

20501101 0. 1. cntrlver

20501102 1. ontrlvar

20501103 1. cntrlvar

20501104 0.327 voidt

20501105 0.105 voldf

20501104 0.244 voldt

20501107 0.25 vOedt

20501108 0.25 voidt

20501109 0.25 voidt

20501110 0.25 vOldt

1. 0. 1 315150000

315140000

315130000

315120000

315110000

315100000

315090000

315080000

315070000

315040000

315050000

315040000

315030000

315020000

315010000

1. 0. 

1

001

002

003

245010000

240010000

240020000

200030000

240040000

1. 0. 

1

002

003

004

325010000

330010000

265010000

240010000

260020000

260030000

260040000

1. 0. 

1

100010000

110010000

110020000

110030000

110040000

110050000

111010000

112010000

115010600

120010000

120020000

130010000

135010000

140010000

1. 0. 

1

200010000

200020000

200030000

200040000

200050000

200060000

200070000

200080000

200090000

200100000

200110000

200120000

200130000

200140000

200150000

200140000

* Go lvi total In the core region 30502000 do.lv.Jp sun 20502001 0. 1. antzlvar

20502002 1. ontrivar

20502003 1. ontrlvar

20502004 1. antrlvar

* core bypase level part 

I

20502500 by.lvll sUR

20502501 0. 0.3440 voidt

20502502 0.3440 voldI

20502503 0.2446 vold[

20502504 0.4405 voed(

20502505 0.2440 voidt

20502504 0.223 void(

20502507 0.2133 voldf

20502500 0.2133 vold(

20502500 0.2133 voldf

20502510 0.2133 voldt

20502511 0.2133 voldt

20502512 0.2133 voldt

20502513 0.2133 vOedt

20502514 0.2133 veldt

20502515 0.2133 voldt

20502514 0.2133 voldt

20502517 0.2015 veldt

ore bypase level part 

2

20502400 by.1vI2 sum

20502401 0. 0.235 voldt

20502402 0.23S voidt

20502403 0.235 voldt

20502404 0.235 vold•

20502405 0.235 vo1ld

20502404 0.235 void•

20502407 0.235 voldi

20502406 0.235 void1

2050260t 0.235 void

20502610 0.235 void

20502411 0.2075 vold

• by lvl total from by bet

20503000 dc.lv.Jp sun

20503001 0. 1. cntrlvar

20503002 1. antrlvar

• pep ennulus level

20503500 sep.annl sum

20503501 0. 0.34 vold

20503502 0.512 void

20503503 0.443 void

20503504 0.443 Vold

20503505 0.449 vold

20503504 0.460 vold

20503507 0.443 void

20503500 0.449 void

20503509 0.449 void

1. 0. 1 150010000

150020000

150030000

150040000

150050000

155010000

160010000

140020000

140030000

140040000

140050000

1400460000

140070000

140080000

140000000

140100000

145010000

1. 0.

170010000 f 170020000 f 170030000

f 170040000

f 170050000

f 170070000

f 170070000

f 170090000

f 170100000

f 175010000

1. 0. 

1 025

024

1. 0. 1 015

014

017

01M

* Ip lvI vertical

20501500 lp.lvl

20501501 0. 0.30

20501502 0.25

20501503 0.25

20501504 0.1443

20501505 0.1443

20501504 0.1114

20501507 0.1415

20501508 0.1400

20501509 0.1745

20501510 0.2

20501511 0.2

20501512 0.174

20501513 0.2

20501514 0.2

• core level

20501400 core.lvl

20501401 0. 0.245

20501602 0.245

20501603 0.265

2050104 0.245

20501405 0.265

20501404 0.265

20501407 0.345

20501408 0.215

20501403 0.245

20501410 0.245

20501411 0.265

20501412 0.245

20501413 0.245

20501641 0.245

20501415 0.220

20501414 0.2

• upper plenum level

20501700 up.lvl

20501701 0. 0.22

20501702 0.22

• up-map level

20501000 upee.lvl

20501801 0. 0.214

20501002 0.214

20501003 0.2345

20501804 0.2345

20501005 0.2345

20501004 0.2345

20501007 0.2345

20501808 0.2345

20501800 0.2345

20501810 0.2345

20501811 0.2345

20501812 0.2345

20501613 0.2345

20501814 0.2345

20501015 0.2345

20501816 0.2345

20501017 0.2345

20501010 0.2345

20501i19 0.2345

20501020 0.2345

SURM

voeld

voidf

voidf

voidf

voidf

void*f

void[

voidf

voldf' voidt

voidf

voldt

voLdt

voeld

sun voldt

voldt

voldt

voldf

voidt

voldf

voidt

voldf

veldi

veldt

voldf

voeld

voidt

voldf

fffffffff

1. 0. 1 225010000

230010000

230020000

230030000

230040000

230050000

230040000

230070000

230080000

• core pover 20504000 oore.pe eum 1. 0. 

1

20504001 0. 0.142907 htrnr 200100101

20504002 0.142907 bhrer 200100201

20504003 0.142007 htrnr 200100301

20504004 0.102307 hnrnr 200100401

20504005 0.142007 htrnr 200100501

20504006 0.142307 htrnr 200100601

20504007 0.102307 htzrr 200100701

20504008 0.162907 htrnr 200100801

20504009 0.162907 htrer 200100901

20504010 0.162907 htrnr 200101001

20504011 0.142307 htrnr 200101101

20504012 0.142307 htrur 200101201

20504013 0.142307 htrnr 200101301

20504014 0.123907 htxnr 200101401 - ext fuel box level 20SOSO00 ezt.fblv 20505001 0. 0.53

20505002 0.53

20505003 0.53

20505004 0.53

20505005 0.53

20505004 0.53

20505007 0.53

20505000 0.429

• heat ozehaneo le

sum 1. 0. voeld 370010000

voidt 370020000

voelf 370030000

voldf 370040000

vOedt 370050000

voldt 370040000

veldt 370070000

voLdt 340010000 sum 1. 0.

voldf 205010000

vold( 210010000

veld

voldf

voldf

veldt' voldf

voidf

voldf

voldf

voldf

voldf

voidf

voidf'

voldt

voeld

voeld

voldt

voeld

voidf'

voldt

voldf

veldt

1. 0. 1 220010000

220020000

220030000

220040000

220050000

220040000

220070000

220080000

220030000

220100000

220110000

220120000

220130000

220140000

220150000

220140000

220170000

220180000

220130000

220200000

20506000 lc.ht sum 1. 0. 1 20504001 0. 1. q $10010000

2050002 1. q 515010000

20504003 1. q 515020000

20504004 1. q 515030000

20506005 1. q 515040000

2050004 1. q 515050000

20504007 1. q 520010000

• heat exchange Io exit pipe (in the tank)

20506100 lc.tube sum 1. 0. 

1

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20504105 1. q 525050000

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A5-13
20504113 1. 20500114 1.

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A5-14
APPENDIX 6:

Overview of the scaling analysis

IThe American Society of

Mechanical Engineers

Reprinted From

Proceedings of the ASME-JSME 4th International

Conference on Nuclear Engineering

Editors: A. S. Rao, R. B. Duffey, and D. Elias

Book No. 10389C - 1996

QUALITATIVE ANALYSIS OF SCALING EFFECTS IN ISOLATION

CONDENSER BEHAVIOUR WITH RELAP5hMOD3.1 THERMALHYDRAULIC

CODE

Francesco D'Auria

Department of Mechanical and Nuclear Constructions

University of PisaVia Diotisalvi, 2 - 56126 Pisa-(ltaly)

Tel. +39-50-585253

Vittorio Faluomi

Department of Mechanical and Nuclear Constructions

University of Pisa Via Diotisalvi. 2- 56126 Pisa (Italy)

Tel. +39-50-585253

ABSTRACT

This paper deals with the attempt to analyse, with the

RelapS/Mod3.1 code, the scaling effects in the behaviour of

Isolation Condenser taking as reference the PO-IC-02

experiment performed in the PIPER-ONE facility available

at Pisa University.

The PIPER-ONE is an experimental facility simulating a

G;eneral Electric BWR-6 with volume and height scaling

ratio of 1/2200 and Ill, respectively. The facility was

properly modified to test the thennalhydraulic caracteristics

of an isolation condenser-type system.

The isolation condenser-type system consists of a oncethrough heat exchanger immersed in a pool with water at

ambient temperature and installed at about 10 m above the

core.

Several calculations have been performed with

RelapS/Mod3ITj and RelapS/Mod3.1 codes, and the

capabilities of code to simulate the behaviour of the isolation

condenser component have .been assessed. The results

obtained cannot be extrapolated to the plant because of the

different scaling of isolation condenser .ystem with respect

to the other components of the facility.

In this paper the effects of "scaling" changes in the

facility nodalization are analysed with the use of

Relaph/Mod3. I code.

The following parameters are considered in the analysis

of scaline effects:

I) Elevation of isolation condenser relative to the top of

active ftcl (TAF):

2) Length of Isolation Condenser tubes3) Diameter of Isolation condenser tubes:

4) Heat exchange area of Isolation condenser"

5) Inlet flow area of Isolation condenser.

A final calculation including all the modifications has

also been performed.

1. INTRODUCTION

Innovative reactors, (essentially AP-600 and SBWR) are

characterized by simplification in the design and by the

presence of passive systems. 'Experimental and theoretical

research are needed to qualify the new components and to

characterize the new thenmal-hydraulic scenarios expected

during accidents. Available system codes have to be validated

in order to be used for evaluating the thennal-hydraulic

perfonnmances of the new systems, especially in case of long

lasting transients evolving at low pressure (D'Auria et. al,

1992a).

In the frame of the activities carried out at University of

Pisa related to the analysis of thermal-h.draulic situations of

interest to the mentioned reactors (e.g. D'Auria et. al, 1992b

and Andeuccetti et al., 1991), three series of experiments have

been carried out utilizing the PIPER-ONE facility. These were

aimed at the experimental investigation of the behaviour of

systems simulating the main features of the Gravity Driven

Cooling System (GDCS, first series of experiments. Bovalini

et al.. 1991a) and of the reactor pressure vessel Isolation

Condenser (IC, second and third series of experiments.

Bovalini et al.. 1992a, D*Auria et. al? 1993, Bovalini et al.,

1992b. and D"Auria et. al, 1994a, respectively). At the same

time RelapS/Mod2 and Mod3 codes (Carlson et al., 1990)

have been extensively applied as best estimate tools to predict

the transient scenarios of both SBWR and AP-600 reactors

(see also D'Auria et. al, 1994b, and Barbucci et al., 1993).

The object of this paper is to evaluate the possibilities to

use RelapS/Mod 3.1 code (Carlson et al., 1990) for

extrapolating the behaviour of PIPER-ONE facility. hi order to

achieve this, a qualified RelapS/Mod3. I nodalization (Bovalini

et al., 1995) of the PIPER-ONE has been used and the

considered modifications have been implemented step-b.-

step to investigate the single effects of each parameter in the

scaling process (D'Auria et al., et al., 1992c)

2. EXPERIMENTAL FACILITY

The simplilied sketch of the apparatus is sho%, n in Fig. I it

includes the main loop, the ECCS simulators (LPCI/CS.

A6-I
QUANTITY UNIT PIPER-ONE SBWR () RATIO(+) IDEAL (N) VALUE

PIPER-ONEJ OF THE RATIO

SBWR PIPER-ONE/SBWR

I rimarv vstem volume m3 0.199 595. 1/2990 112990

2 Core height In 3.710 2.743 1.35/1 1I1

3 Maximun nominal core MW 0.320 2000. 1/6200 1/2990

power

4 Value of 3% core power MW 0.041 () 60. 1/1463 1/2990

S Ratio (3% core power) MW/hn 0.206 0.1 2.06/1 111

/primary system voluhe 3

6 Isolation condenser heat m2 0.301 184 1/610 112990

transfer area (++)

7 Isolation condenser heat W" 1.512 0.31 4.9/1 1/1

transfer area over primary

system volume

8 lsolatictmiavIftne 1113 0.0015 2.334 1/1556 1/2990

9 Isolation condenser volune - 0.0075 0.0038 1.97/1 I/

over primary system volume

10 Isolation condenser heat ru2/kW 7.341 3.066 2.39/I 111

transfer area over 3% core

power

I I Height of isolation m 8.64 24.75 1/2.86 1/1

condenser top related to

bottom of active fuel

12 Diameter ofa single tube In 0.020 0.0508 1/2.54 1/1

13 iTda'fa.ai.let1te In 0.0023 0.0023 1/1 1/1

(*) non-dimenmomi (4)I(' data have been taken from Tefeience 1151 ti+) ube bundles (-)misated to BWR6

Tab. 1 - Comparison between isolation condenser related data in PIPER-ONE and in SBWR.

HPCI/CS) and the systems simulating ADS, SRV and

steam line, as well as the blow-down line. Ten zones can be

identified in the mnain loop: lower plenum, core, core bypass

(outside the core), guide tube region, upper plenum, region of

separators and dryers, steam dome, upper down comer, lower

down comer and jet pump region.

The volume scaling factor is about 1/2200, %&tile the core

cell geometry and the piezometric heads acting on the lower

core support plate are the same in the model and in the

reference plant.

The heated bundle consists of 16 (4x4) indirectly heated

electrical rocd whose height, pitch and diameter are the same

as in the reference plant (Fig. 2). The maximum available

power is 320 kW, corresponding to about 25% of scaled full

power of the reference BWR.

As already mentioned, the facility hardware was modified

by inserting the ICS loop. which can operate at the same

pressure as the main circuit.

The main component of Isolation Condenser loop is a heat

exchanger consisting of a couple of flanges that support 12

pipes, 22 nun outer diameter and 0.4 m long. it is inmnersed in

a tank of I 1n3 volumne,'containing stagnant water, located at

4th floor of the PIPER-ONE service structure. The heat

exchanger is connected at the top and at the bottom

respectively with the steam dome and the lower plenum of the

main loop. In order to enhance natural convection inside the

pool, a sort of shroud has been installed that divides the pool

into two parts; a hot one and a cold one, the former

encompassing the IC as can be seen in Fig. 4.

The Isolation Condenser loop is instrumented with a

turbine flow-meter and a diflerential pressure transducer on

the hot side and a series of almost 30 thermocouples in various

position of the IC and of the pool as can be derived from Fig.

2.

Hardware restrictions preclude the possibilityjo have a

system correctly scaled with respect to those provided for the

new generation nuclear reactors, particularly dte GE SBWR. In

particular, the heat transfer area of Isolation Condenser in

PIPER-ONE is roughly five times larger than the ideal value

(Tab. I). The distance between bottom of the active fuel and

the Isolation Condenser and the height of the core itself, are

two of the most important parameters differentiating PIPERONE from SBWR. These essentially prevent any possibility of

extrapolating PIPER-ONE experimental data to SBWR.

3. EXPERIMENT

The experiment comprises two phases characterized by

ditferent values of heating power (about 40 and 75 MW,

respectively), later indicated as phases A and the B of the test.

They correspond to the scaled value of the core decay power

and to the capability of heat removal by the IC device,

A6-2
PARAMETER SIGN UNIT VALUE

LP pressure PA-LP-I MPa 5.1

LP fluid temperature TF-LP-. K 262.5

Core level LP-CC-l in 11.9

Down comer level LP-LD-I m 10.7

IC line fluid temperature TF-IC-l K 17.5

IC pool fluid temperature TF.SC-l K 17.5

Tab. 2- PIPER-ONE test PO-IC-2: initial conditions

PARAMETER OR EVENT TIME (s)

Test initiation 0.0

IC top valve opens 4.0

IC bottom valve opens 32.0

IC top valve closes 508.0

IC top valve opens again 602.0

IC top and bottom valve close 1106.0

End o' test 1194.0

Tab. 3- PIPER-ONE test PO-IC-2: boundary conditions

determined from the previous test PO-SD-8 (Bovalini et al.,

1 992b).

As usual for the experiments carried out in the PIPER-ONE

facility, the test was dcsigned on the basis of pre-test

calculations perfonned by Relap5/Mod3 code.

The test specifications foresaw constant heating power for.

5/10 minutes for both experimental phases, in such a way that

quasi-steady state conditions could be reached by the main

thennal-hydnaulic quantities (pressure, flow rates, collapsed

levels, etc.).

In the test, the primary circuit was pressurized at the

specified value by single-phase natural circulation, the heat

source was provided by the core simulator and the structure

heating system. Then, liquid was drained from the primary

circuit for establishing the test specified liquid levels, roughly

at the steanm separator top elevation. After some hundreds

seconds of steady conditions, with heat losses compensated by

the heating cables, the test started by supplying power to the

core simulator and opening the valves of the IC loop.

The initial and boundary conditions measured during the

test PO-IC-02 are given in Tabs. 2 and 3.

The most significant results measured during the phases A

and B are rexprted in the Figures 3 to 6.

Figure 5 shows the different phases of the transient; when

the core pxower is around 40 kW. the primary pressure

decreases (0.3 MPa/min), demonstrating that the power

exchanged through the Isolation Condenser is greater than the

supplied power. Roughly a steady condition is reached at

around 75 kW (phase B), with a decrease of primary pressure

of only 0.02 MPalmin. According also to the results of the test

P(-SD-9, the overall power removed by the Isolation

Condenser is of the order of 80 kW, corresponding to an

average heat flux of about 200 kW/in2 in the considered

conditions. The condensate mass flow rate, registered at the

drain line (Fig. 4), appears quite constant along the two phases

of the test (the tuftine transducer was initially blocked, but

started to operate with about 3 minutes of delay from the

opening of the IC valve).

In Fig. 5, the fluid temperatures measured in three

positions along the Isolation Condenser heat exchanger are

compared with the steam temperature at the IC inlet (equal to

the saturation temperature corresponding to the primary system

pressure)- in particular, the bottom curve gives an idea of the

sub cooled conditions attained by the liquid exiting from the

heat exchanger.

Finally, the curves in Fig. 6 essentially show the strong

fluid temperature stratification in the pool: in the upper zone,

the temperature increases up to about boiling conditions at the

test end. while the bottom part of the pool remains at ambient

temperature during all the test (fluid temperature less than 20

4C).

4. SCALING METHOD AND INPUT DECK

MODIFICATIONS

4.1 The scaling method

The adopted scaling methodology is organised in the

following steps (Fig. 7):

I) set-up of nodalization of considered facility and

calculation of a transient to qualifying tie nodalization itself.

This input deck is used for the "base calculation" (D'Auria et

al., 1995).

2) identification of relevant parameters for the considered

transient: this step defines which parameters in the facilities

have to be properly scaled to represent the reference plant

behaviour.

3) ctnsideration of the value of above parameters in the

facility and scaling to the reference plant.

A6-3
Parameter Identifier Scaling Facility actual Facility scaled Reference value

factor value value lant)

Elevation of Isolation Condenser TOIC-TAF 111 4.7 m 22.7 m 22.7 mi

from the core

Isolation Condenser Heat IC HTA 1/2990 0.23 in2 0.061 m2 184 m2

exchange area

Isolation Condenser Tubes IC TDH 1/1 0.02 m 0.05 m 0.05 m

Equivalent Diameter

Isolation Condenser Tube length IC TL 1/1 0.314 in 2.4 m 2.4 m

Isolation Condenser flow area IC TFA 1/2990 0.0037 m2 0.00102 m2 3.05 m2

Tab. 4: Modified parameter for scaling analysis

Input deck Parameter changed Nodalization modifications Remark:

POGONLYI elevation of IC (same -add of a MSV to connect the old MSV to the The dimension of added tubes

as SBWR) new position of IC (30 volumes) and heat structures are the same

-add a 35 volumes to the IC outlet line as the preesistent componenets.

connecting the IC to the DC. No heat losses are applied to

these new volumes.

POGONLY2 heat transfer area change of heat slab dimensions and inner and

scaled to SBWR outer cilindrical shell representing the IC tube

wall to have a scaled heat transfer area nad the

same values of heat slab radius as reference

_________________ ~~~lant. _________________

POGONLY3 tube diameter of IC change of hydraulic diameter of IC tubes in the

(same as SBWR) volume representing the bundle in the

nodalization

POGONLY4 Length of IC tubes change of length of IC tube and pool dimension.

same as SBWR Te position of IC relatively to the pool is kept

constant as in the base case nodalization.

POGONLYS IC flow area (scaled to the flow area of pipe stack representing the IC

the SBWR) bundle has been scaled to the SBWR plant.

Table 5: List of modifications made to the nase nodalization for parameter influence evaluation in the scaling activity.

4) set-up of individual facility nodalizations adopting the

scaled values from the previous step.

5) set-tip of the final nodalization with all the

modifications; comparison of the results with the experimental

data.

6) test calculation of a different transient adopting the

scaled input deck, and comparison vith plant calculation

results (base case can be considered). This step has not been

dealt witi in the present paper.

4.2 Relevant modification to the base input deck

The standard IBM RISC version of Relap5/Mod3. I has

been adopted.

The base nodalization of the PIPER-ONE facility has been

previously developed for PO-IC-2 experiment analysis

(Bovalini et al., 1995)

The list of modilied parameters is given in Tab. 4. For each

paramneter different calculations have been performed,

including sensitivities and use of different codes.

In Tab. 5 the different nodalizations and the modifications

introduced are summarized.

The following constraints have been considered:

a) the overall facility volune has been kept nearly constant

(overall modifications increase the total volume of 2 %),

because it was already scaled to the plant;

b) the additional volumes are thermally insulated.

5. RESULTS OF CODE APPLICATION

5.1 Output relevant parameters

For evaluating the calculation results the

parameters have been used:

following

- System pressure;

- IC mass flowrate,

- IC fluid temperature jump from inlet to outlet;

A6-4
- Core level;

- Dowuncomer level;

- Temperature jump from IC fluid to inner pool

fluid,

- IC exchanged power.

- Temperature jump from inner to outlet pool fluid.

Some results are given in Figs. 8 to 15. The complete

evaluation of results can be found in D 'Auria et al., 1995.

5.2 One-step analysis

The results of single parameter variations are given in Figs.

9 fronm Il. Detected differences are related to the

experimental data:

PONI (Elevation of IC same as in the SBWR plant):

Large difference in the pressure trend of primary system are

due to the high flow rate in the IC (higher driving force) and

consequent high heat transfer between IC tubes and pool.

Higher values of fluid temperature in the IC tubes (>50 K) give

a lower fluid temperature jump along the IC tubes (150 K

lower than in the exp. case). No relevant modifications in the

phenomenological description of the transient.

PON2 (Heat transfer area scaled to SBEWR): No significant

differences in the overall scenario were calculated. hi the IC

tubes the calculated fluid temperature was 100 K lower than in

the experiment. To be noted that the calculation was stopped

after 800 s. due to code failure in the calculation of water

properties.

PON3 (Tube diameter of IC same as in the SBWR): The

calculation showed similar results as in previous case, with

some differences in the primary s.'stem pressure, owing to the

higher value of fluid temperature in the IC tubes (around 250

K) and at the IC outlet.

PON4 (Length of IC tubes same as SBWR): Lower values

of IC tubes Iluid temperature than in previous calculations have

been calculated. The length of tubes allows more cooling of IC

fluid from IC pool, so that the values of subcooling at the IC

outlet is higher than in previous cases and also higher than

experimental and base calculation values.

PON5 (IC flow area scaled to the SBWR): Similar results

as PON3 calculation.

5.3 Global Effect analysis

The different modifications to the base input deck previous

analysed have been considered togheter to evaluate the global

effects in the transient. The Figs. 1 2 to 15 show the results.

System pressure: the elevation of IC with respect to the

core mostly contributes to the diflerent trend of pressure, lower

than experimental value of 0.5-0.8 MPa (Fig. 12). This effect

is due mainly to the increase of mass flow rate (Fig. 13)

through the IC and the higher power exchanged (Fig. 14) in the

IC itself

Mass flow rate: the average value of mass flow rate

through the IC is nearly twice (0.05 Kg/s instead of 0.025

Kg/s) than in the experimental and base case. This also affects

the exchanged power, higher than in the experimental case.

Fluid temperature in IC tubes: the value of IC tubes

fluid temperature is 50 K higher than in the experimental case

(Fig. 15). Moreover, the temperature jump between IC inlet

and outlet is 150 K lower than the experimental results. This

effect is connected with the pressure trend.

6. CONCLUSIONS

With the above described scaling method the following

main results have been achieved:

- the relevant phenomenological aspect of PO-IC-2 experiment

(i.e. the constant value of power exchanged in IC bundle

depending on dowucomer level) have been also calculating

by the modified (scaled-up) nodalization; so, the measured

scenario can be considered applicable to the SBWR, though

the experimental apparatus was not properly scaled.

The adopted method seem to be capable to handle the main

phenomenological aspect of transient, and might also predict

some aspects that are expected but not obtained due to

lhiitation of facility design.

In addition, it can be noted that there is no substantial

disagreement in the overall evaluation of parameters

considered as reference to evaluate the scaled nodalization: the

system pressure decreases, following an increment of mass

flow rate of IC and the related increment of power exchanged.

The subcooling is also is than in experimental case, according

with the low level of energy stored in the system (low value of

system pressure). Some additional interesting effects can be

noted in the calculation perforned with this modified

nodalization : along the inner pool there is no strong thermal

stratification as in the experimental case (Fig. 16) and the

calculated mass flow rate through the internal pool (Fig. 17) is

higher than the base value. These effects can be directly

connected with the modifications of input deck, especially with

the new position of Isolation Condenser with respect to the

core.

REFERENCES

Andreuccetti P., Barbucci P., Donatini F., D'Auria F.,

Galassi G. M., Oriolo F., 1991: "Capabilities of the RELAPS

in Simulating SBWR and AP-600 Thermalhydraulic

Behaviour", IAEA Technical Committee AMeet. (Ta f) on

Progress in Development and Design Aspects of Advanced

Ifaiter ('ooled Reactors, Rome (I).

Barbucci P., Bella L., D'Auria F., Oriolo F., 1993: "SBWR

Thennalhvdraulic Perfornance: a RELAPS/MOD2 Model

Simulation', 6th Int. Top. Meet. on Nuclear Reactor

Thennalhydraulics, Grenoble (F).

Bovalini R., IYAuria F., Mazzini M., 1991: "Experiments of

Core Coolability by a Gravity Driven System performed in

A6-5
PIPER-ONE Apparatus", .4AM Winter Afeeting, San Francisco

(CA).

Bovalini R., D'Auria F., Mazzini M., Vigni P., 1992a:

"Isolation Condenser Perfornances in PIPER-ONE

Apparatus", European Two-Phase Flow Group Meet.,

Stockholm (S).

Bovalini R., DYAuria F., Galassi G.M.. Mazini M., 1992b:

"Piper4-One Research: the Experiment PO-SD-S Related to the

Evaluation of Isolation Condenser Performance. Post-Test

Analysis Carried out by RelapS/Mod3-7J code", University of

Pisa Report. DCMN - NT 200 (92), Pisa (I).

Bovalini R., D'Auria F., Galassi G. M., Mazzini M. 1995:

'Post-test Analysis of PIPER-ONE PO-IC-02 Experiment by

RelapS/Mod3 Codes" . Uniersin, of Pisa Report, DCMN NT

254 (95). Pisa (I).

Carlson K.E., Riemke R.A., Rouhani S.Z., Shurnway R.W.,

Weaver W.L..1990: "Relap5/Mod3 Code Manual - Volume II.

User Guide and Input Requirements", NUREG/..VR-5535.

DIAuria F., Modro M., Oriolo F., Tasaka K., 1992a:

"Relevant Thermaihydraulic Aspects of New Generation

LWRs" CSN! Spec. AMeer. On Twansient Two-Phase Flow -

System Thelrnalhydraidics, Aix-En-Provence (F).

DIAuria F., Galassi G.M., Oriolo F., 1992b:

"Thermalhydraulic Phenomena and Code Requirements for

Future Reactors Safety Analysis", Int. Coif on Design and

Safety of Nuclear Power Plants (AVP) - Tokyo (J).

D'Auria F., 1992c: "Scaling and Counterpart Tests", CSNI

Spec. Aleeting om Trmnsienr Two-Phase Flow: System

Theimallhdraulics - Aix en Provence (F).

DAuria F., Vigni P., Marsili P., 1993: "Application of

RelapS/Mod3 to the Evaluation of Isolation Condenser

Perfonnance", Int. Conf. on Nuclear Engineering (7CONE-2) -

San Francisco (US).

DAuria F., Galassi G.M:, Mazzini M., Pintore S., 1994a:

"Ricerca Piper-One: specifiche Dettagliate della Prova PO-IC2" Universi.v of Pisa Report. DCMN - NT 234(94), Pisa (1).

DIAuria F., Oriolo F., Bella L., Cavicchia V., 1994b: "AP600 Thennalhydraulic Phenomenology: A Relap5/Mod2 Model

Simulation", Int. Conf on New Trends in Nuclear System

Thermohyvdraulics - Pisa (I). Int. Top. A4eertig on Advanced

Reactor Safety - Pittsburgh (PA).

D'Auria F, Faluomi. V., 1995: "Qualitative Analysis of a

scaling method for Piper-One facility", University of Pisa

Report, to be published.

t -bc,

0,

a

'17 3C

"r4ct

Fig. 1 - Sketch of PIPER-ONE Fig. 2 - Sketch of isolation condenser pool

with temperature measurement locations

A6-6
I

I

g

I

TMie (a) ram Is)

Fig. 3 - Phases of experimental transient

350.

ISO.

4M0.

350.

Mo0.

430

* 91.rns Tea POIC-2 xxaa~.

UA W1-t Wa £IAW.

*EZldpd M £ZAWts

XXX 9QATF4C-S

V4rf WAMC4

= CIZATF4C.

Fig. 4 - Condensate mass flow rate

Plper-Oa Tes1 POI-3, Uxi £'ZAW-rC.1

370.0 s na anecs vuly• WY OAW,4C.t

8- ATt3-PSC4

360.0

330.0

3140.0

3.0

330.0

.0M 0 2% 400 I0M 0 1000 12N0

ram Is)

Fig 6 - Fluid temperature along the pool

0 200 4W0 6M0 am I=0

T7** (S)

Fig. 5- Fluid temperature along Isolation

Condenser tubes

Fig. 7 - Flow chart of scaling method adopted

A6-7
14.000

14.000

L

2.000

I

*

I

I

.20 0 2D 4W0 600 $G low 1200

T"m '()

Fig. 8 - Scaling results: system pressure,

one step analysis

I

TWO ($I

Fig. 9- Scaling results: IC mass flow rate,one step

analysis

11.20

* Pipu-oc Toml Poac2 1= C P~OMP

Se a * effec alnalySa V• ¢1OC3TVAM

1.00 One-t,- calculat= POaffMfvAw MW ONC3CALVAMI AM POOfOfVMVAM

Ws PON4aNTfVAAM

0.80 000 P9oNM.VMWU

4 0.40

0.200

.0.2,0

-200 21200 0 200 M we 11 low0 

TMW a)

Fig. 11 - Scaling results: IC power exchanged

one step analysis

0.400 PWER, ONG[Tom P"4-l Mx W11 sMf- rCCK

41,30O

70.2S0

0.150

- 0' II

Two ta)

Fig. 10 - Scaling results: IC middle level tube fluid

one step analysis

?4.500

IL -u

a 2 400 6W0 No0 low 1200

20 M400 600 W00 1000 1200

T7kn (s)

Fig. 12 - Scaling results: system pressure, global

effects analysis

nfw (4s

Fig. 13 - Scaling results: IC mass flowrate

effects analysis

A6-8
B IG

I I

Tim. Is) TWO 48)

Fig. 14- Scaling results: IC exchanged power

global effects analysis

Fig. 15 - Scaling results:middle level tube

fluid temperature,global effects analysis

380A.

I

I

I

I

£

4OO

111-u (S)

ismGO

Fig. 16 - Scaling results: thermal stratification

along the pool.global effects analysis

Tkne (8)

Fig. 17 - Scaling results:calculated circulation flow

along the poolglobal effects analysis

A6-9

NRC FORM 536 U.S. NUCLEAR REGULATORY COMMISSION 1. REPORT NUMBER

(24M) (Assiged by MtC, Add VoL. SM. Rev.

NRC. 113 BIBLIOGRAPHIC DATA SHEET

,roehwkuct ,u " myaw NUREGIIA-0135

2. TITLE AND SUBTITLE CAMP006

Post-Test Analysis of PIPER-ONE PO-IC-2 Experiment by RELAP5IMOD3 Codes D REPORT P

MONTH YEAR

November 1996

4. FIN OR GRANT NUMBER

W6238

S. AUTHOR(S) 6. TYPE OF REPORT

R. Bovalilni, F. D. Aurla, G. M. Galassi, M. Mazzini Technical

7. PERIOD COVERED pbova Dan)

. PERFORMIG ORGANIZATION - NAME AND ADDRESS EWNr. pwhShvmOfficeva•crReg% US& MEcbwRFgub/y CnaVsaxn aid ewft afin udduea ifowi,

PMyvde name end mRllng ddwssj

University of Pisa

Via Diotisalvi, 2

1-56126 Pisa

Italy

S. SPONSORING ORGAN17-ATION. -AM AND ADDRESS g'• MyC 6" 'Sen as&val 1 cotcr pmvids ARC Ws/xk , t or Reix U.&. Akba ftbx-y Ccmdnsim

and m•ft iddres.j

Office of Nuclear Regulatory Research

U.S. Nuclear Regulatory Commission

Washington, DC 20555-0001

10. SUPPLEMENTARY NOTES

S. Smith, NRC Project Manager

11. ABSTRACT (2= wads arbs)

RELAPS/MOD3.1 was applied to the PO-IC-2 experiment performed In PIPER-ONE facility, which has been modified to

reproduce typical isolation condenser thermal-hydraulic conditions. RELAP5 is a well known code widely used at the University of

Pisa during the past seven years. RELAP5/MOD3.1 was the latest version of the code made available by the Idaho National

Engineering Laboratory at the time of the reported study. PIPER-ONE Is an experimental facility simulating a General Electric

BWR-6 with volume and height scaling ratios of 1/2200 and 1.11, respectively. In the frame of the present activity a once-through

heat exchanger Immersed in a pool of ambient temperature water. Installed approximately 10 m above the core, was utilized to

reproduce qualitatively the phenomenologles expected for the Isolation Condenser In the simplified BWR (SBWR). The PO-IC-2

experiment is the flood up of the PO-SD-8 and has been designed to solve some of the problems encountered In the analysis of

the PO-SD-8 experiment A very wide analysis Is presented hereafter Including the use of different code versions.

12. KEY WORDS/DESCRIPTORS AMt wod, ara, Nutwi u.wtIww in/ic.tig i. ,-t) 13. AVALABILITY STATEMENT

CAMP Unlimited RELAP5/MOD3 14. SEcURnY CLASSIFCATION RELAP/MOD3(rv P~ew

unclassified

I'r. Repo

unclassified

15. NUMBER OF PAGES

16. PRICE

NRC FORM 335 C2419) 7W form vm elecoanl=4 prodwed by Elb Fadval Famm. Irc
Federal Recycling Program

UNITED STATES

NUCLEAR REGULATORY COMMISSION

WASHINGTON, DC 20555-0001

SPECIAL STANDARD MAIL

POSTAGE AND FEES PAID

USNRC

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PENALTY FOR PRIVATE USE. $300