NUREG/IA-0170

International 

Agreement Report 

RELAP5/MOD3.2 

Post Test Calculation of the 

PKL-Experiment PKLIII-B4.3 

Prepared by 

L. Karner 

Siemens Energierzeugung (KWU) 

Freyerslebenstrasse 1 

D-91058 Erlangen 

Germany 

Office of Nuclear Regulatory Research 

U.S. Nuclear Regulatory Commission 

Washington, DC 20555-0001 

December 1999 

Prepared as part of 

The Agreement on Research Participation and Technical Exchange under the International Code Application and Maintenance Program (CAMP) 

Published by 

U.S. Nuclear Regulatory Commission
AVAILABILITY NOTICE 

Availability of Reference Materials Cited in NRC Publications

NRC publications in the NUREG series, NRC regu

lations, and Title 10, Energy, of the Code of Federal 

Regulations, may be purchased from one of the fol

lowing sources: 

1. The Superintendent of Documents 

U.S. Government Printing Office 

RO. Box 37082 

Washington, DC 20402-9328 

<http://www.access.gpo.gov/sudocs> 

202-512-1800 

2. The National Technical Information Service 

Springfield, VA 22161 -0002 

<http://www.ntis.gov/ordernow> 

703-487-4650 

The NUREG series comprises (1) brochures 

(NUREG/BR-XXXX), (2) proceedings of confer

ences (NUREG/CP-XXXX), (3) reports resulting 

from international agreements (NUREG/IA-XXXX), 

(4) technical and administrative reports and books 

[(NUREG-XXXX) or (NUREG/CR-XXXX)], and (5) 

compilations of legal decisions and orders of the 

Commission and Atomic and Safety Licensing 

Boards and of Office Directors' decisions under 

Section 2.206 of NRC's regulations (NUREG

XXXX). 

A single copy of each NRC draft report is available 

free, to the extent of supply, upon written request 

as follows: 

Address: Office of the Chief Information Officer 

Reproduction and Distribution 

Services Section 

U.S. Nuclear Regulatory Commission 

Washington, DC 20555-0001 

E-mail: <DISTRIBUTION@nrc.gov> 

Facsimile: 301 -415-2289 

A portion of NRC regulatory and technical informa

tion is available at NRC's World Wide Web site: 

<http://wwwnrc.gov> 

All NRC documents released to the public are avail

able for inspection or copying for a fee, in paper, 

microfiche, or, in some cases, diskette, from the 

Public Document Room (PDR):

NRC Public Document Room 

2120 L Street, N.W., Lower Level 

Washington, DC 20555-0001 

<http://www.nrc.gov/NRC/PDR/pdrl .htm> 

1 -800-397-4209 or locally 202-634-3273 

Microfiche of most NRC documents made publicly 

available since January 1981 may be found in the 

Local Public Document Rooms (LPDRs) located in 

the vicinity of nuclear power plants. The locations 

of the LPDRs may be obtained from the PDR (see 

previous paragraph) or through: 

<http://www.nrc.gov/NRC/NUREGS/ 

SR 1350/V9/lpdr/html> 

Publicly released documents include, to name a 

few, NUREG-series reports; Federal Register no

tices; applicant, licensee, and vendor documents 

and correspondence; NRC correspondence and 

internal memoranda; bulletins and information no

tices; inspection and investigation reports; licens

ee event reports; and Commission papers and 

their attachments. 

Documents available from public and special tech

nical libraries include all open literature items, such 

as books, journal articles, and transactions, Feder

al Register notices, Federal and State legislation, 

and congressional reports. Such documents as 

theses, dissertations, foreign reports and transla

tions, and non-NRC conference proceedings may 

be purchased from their sponsoring organization. 

Copies of industry codes and standards used in a 

substantive manner in the NRC regulatory process 

are maintained at the NRC Library, Two White Flint 

North, 11545 Rockville Pike, Rockville, MD 

20852-2738. These standards are available in the 

library for reference use by the public. Codes and 

standards are usually copyrighted and may be 

purchased from the originating organization or, if 

they are American National Standards, from

American National Standards Institute 

11 West 42nd Street 

New York, NY 10036-8002 

<http://wwwansi.org > 

212-642-4900

DISCLAIMER

This report was prepared under an international cooperative 

agreement for the exchange of technical information. Neither 

the United States Government nor any agency thereof, nor any 

of their employees, makes any warranty, expressed or implied, 

or assumes any legal liability or responsibility for any third

party's use, or the results of such use, of any information, appa

ratus, product, or process disclosed in this report, or represents 

that its use by such third party would not infringe privately 

owned rights.

I
NUREG/IA-0170

International 

Agreement Report 

RELAP5/MOD3.2 

Post Test Calculation of the 

PKL-Experiment PKLIII-B4.3 

Prepared by 

L. Karner 

Siemens Energierzeugung (KWU) 

Freyerslebenstrasse 1 

D-91058 Erlangen 

Germany 

Office of Nuclear Regulatory Research 

U.S. Nuclear Regulatory Commission 

Washington, DC 20555-0001 

December 1999 

Prepared as part of 

The Agreement on Research Participation and Technical Exchange 

under the International Code Application and Maintenance Program (CAMP) 

Published by 

U.S. Nuclear Regulatory Commission
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

Table of Contents 

Abstract 

Abbreviations 

1 Introduction 

2 Description of the PKL Test Facility 

3 Description of Experiment PKLIII-B4.3 

3.1 Objectives of Test PKLIII-B4.3 

3.2 Initial and Boundary Conditions of the Test B 4.3 

3.3 Sequence of Events 

3.4 Phenomenological Analysis of Test Results 

4 Results of RELAP5/Mod 3.2 Analysis 

4.1 Description of RELAP5/Mod 3.2 

4.2 Description of Input Model 

4.3 Calculational Procedures and Boundary Conditions 

4.4 General System Response 

4.5 Steam Generator Heat Transfer as a Function of 

Nitrogen Distribution in the Primary System 

4.6 Propagation of Nitrogen Concentration in the 

Steam Generator U-Tubes 

5 Conclusions 

References 

List of Figures 

Figures 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All dghts, including rights created by patent grant or registration 

Siemens AG - Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamer~pk13b43_wrr5m3.2-my.doc 

H30-K5314 Bencht KWU, engl. 4.94 D

Page
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

Abstract 

The PKL III test facility (Primar-Kreis-Lauf) simulates a typical 1300 MWe 

Pressurized Water Reactor of Siemens/KWU. In test B4.3, the influence of non

condensables on heat transfer in the steam generators during reflux condenser 

conditions was investigated. 

This report presents the results of a post-test analysis of PKL 111-B4.3 using 

RELAP5/Mod 3.2. A description of the input model is given, and the 

correspondence of measured and calculated results is discussed. 

The results of the calculation show differences in the distribution of nitrogen in the 

primary system compared to the experiment. When nitrogen was injected into the 

hot leg of the primary system, the heat transfer in the affected steam generator 

decreased. In contrast to the experiment RELAP calculated that the volumes in 

the adjacent steam generator did not get the full amount of nitrogen and that 

nitrogen was transported from the steam generators to other locations during the 

course of the transient. Thus the heat transfer in these steam generators later 

increased in contradiction to the measured values. 

In the steam generator tubes, RELAP calculated that the nitrogen accumulates in 

the descending part as predicted in the experiment. For the ascending U-tubes 

RELAP predicted that the nitrogen was transported to the loop seal, which was not 

seen in the experiment. 

Fluctuations occured during the course of the RELAP5/Mod 3.2 analysis of the 

PKLIII B4.3 experiment. This phenomenon may be the main reason, that RELAP 

calculates the transport of nitrogen from the steam generators into the system and 

predicts finally a homogeneous distribution of nitrogen in the primary system. 

The analysis performs an inkind contribution to the CAMP contract. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights. including rights created by patent grant or registration Siemens AG • Power Generation Group (KWU) ofa utillity model ordesign, are reserved. 

L:\Karner\pk13b43_wr.r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 3
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Abbreviations

ACCU 

ARV 

ASC. 

Byp. 

CAMP 

CCFL 

CL 

CV, CNTRLVAR 

DC 

DE 

Depress., dp 

DESC. 

DH 

Diff. 

Exp. 

HKPM, RCP 

HL 

Int., Integr. 

L 

LOCA 

LPL 

MFLOWJ 

N 

PKL, PCL 

Press., P 

Primary-S. 

PWR 

R 

RDB, RPV 

SATTEMP 

SATT-Pr. 

SATT-Sec. 

SBB 

SBLOCA 

Secondary-S. 

SG 

SPW 

SV 

TEMP 

UPL 

U-tubes

accumulator 

Abblaseregelventil (relief valve) 

ascending (U-tubes) 

bypass 

Code Assessment and Maintenance Program 

counter current flow limitation 

cold leg, collapsed level 

control variable 

downcomer 

Dampferzeuger (SG) 

depressurization 

descending (U-tubes) 

Druckhalter (pressurizer) 

difference 

experiment 

Hauptk~hlmittelpumpe (reactor coolant pump) 

hot leg 

integrated 

loop 

loss of coolant accident 

lower plenum 

junction mass flow 

nitrogen 

Primdrkreislauf, Primary Coolant Loop 

pressure 

primary side 

pressurized water reactor 

RELAP 

Reaktordruckbehdlter, reactor pressure vessel 

saturation temperature 

saturation temperature primary side 

saturation temperature secondary side 

StabbOndelbehdlter (rod bundle vessel) 

small break LOCA 

secondary side 

steam generator 

Speisewasser (feedwater) 

Sicherheitsventil (safety valve) 

temperature 

upper plenum 

tubes with n-profile for SGs

Siemens AG • Power Generation Group (KWU) 

L:\Kamer\pk13b43-wr r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 0

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 4
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

1 Introduction 

The PKL III test facility simulates a typical 4 loop 1300 MWe pressurized water 

reactor of Siemens/KWU design. Within the PKL Ill-B4 test series, three tests 

have been performed to investigate the influence of non-condensables in the 

primary system on steam generator heat transfer. 

In Test B4.1 the primary inventory was 100 % and thus the influence of non

condensables on single-phase natural circulation was investigated. In Test B4.2 

the primary inventory was reduced to 85% which generated two-phase natural 

circulation. In test B4.3, by a further reduction of the inventory to 35% the 

influence of non-condensables on reflux-condenser conditions was investigated. 

In this report a post-test analysis of PKL 1l1-B4.3 using RELAP5/Mod 3.2 is 

presented. A description of the input model is given, and the correspondence of 

measured and calculated results is discussed. 

The purpose of this analysis is to serve as a contribution to the verification of 

RELAP5/Mod 3.2's ability to handle a non-condensable component in the 

gaseous phase properly.

Siemens AG - Power Generation Group (KWU) 

L:\Kamer~pkl3b43_wr_r5m3.2_my.doc 

H30-K5314 Benrcht KWU , engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page5
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

2 Description of the PKL Test Facility 

The PKL III test facility simulates a typical 1300 MWe pressurized water reactor of 

Siemens/KWU of a volume/power scale of 1:145 (Fig. 2.1). All elevations 

correspond to real plant dimensions. It is a large scale facility with four primary 

loops, which are arranged symmetrically around the pressure vessel. Each of the 

four loops contains a main coolant pump and a fully scaled steam generator with 

prototypical tubing and tube sheet. The core is simulated by a bundle of 314 

electrically heated rods, with a total power of 2.5 MW, corresponding to 10% of the 

scaled nominal power. The primary pressure is limited to 4.5 MPa. Regarding the 

limited pressure of the PKL Ill test facility the scaling of the experiments falls into 

three general categories: 

The first category of experiments provides an insight into special physical 

phenomena, such as CCFL or the influence of nitrogen, which are expected to 

take place in PWR's at pressures below 4.5 MPa. The second category concerns 

experiments "entering" a PWR-transient at a pressure level of 45 bar. The 

conditions in PKL at the start of such a test are set up using code-calculations for 

the PWR, an example being small break LOCAs, where the important phenomena 

occur at pressures below 50 bar. The third category covers scenarios where 

phenomena occurring at high pressures in PWR's can be simulated at pressures 

below 50 bar in PKL, with the results being extrapolated to the original pressure 

(with the help of codes or comparisons with experimental results from full-pressure 

test facilities). 

The test facility is equipped with all important safety and auxiliary systems, e.g. 

volume control system, high and low pressure injection system, accumulators and 

residual heat removal system. In correspondence to KWU-type plants, four 

independent high and low pressure injection systems which are connected to both 

the hot and cold legs are simulated. 

The arrangement of the test facility is shown in Fig 2.1, 

The steam generators of the test facility are equipped with U-tubes. Each SG has 

27 heat exchanger tubes in accordance to the 1:145 scale. The tubes are 

arranged to assemblies with 7 different lengths. The peak elevations of the longest 

and shortest tube correspond to the plant dimensions. Two replacement bodies 

are inserted in the secondary side to achieve the volume scale. A cross-sectional 

view is given by Fig. 2.2. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

Siemens AG - Power Generation Group (K/VIU) of a utillity model or design, are reserved. 

L:\Kamerkpkl3b43_wrr5m3.2_my.doc 

H30-K5314 Bericht KWU . engl. 4.94 D

Page 6
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

At least 3 U-tubes in each SG are equipped with thermocouples for the 

measurement of primary side fluid temperature at different axial positions. The 

axial location of these thermocouples is shown in Fig. 2.3. 

Within the test facility there are more than 1300 locations for measurement 

instrumentation. This provides extensive information necessary for the 

understanding of all relevant thermal hydraulic phenomena.

Siemens AG • Power Generation Group (KWU) 

L:\Kamer~pk13b43_wrr5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page7
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

3 Description of Experiment PKLIII B4.3 

3.1 Objectives of Test PKLIII B4.3 

Beginning by January 1989 the test series IIIB was initiated at the PKL test 

facility. Focused on accident-management procedures the majorities of tests were 

performed in order to investigate phenomena occurring during primary side and 

secondary side feed and bleed procedures. Within PKL III B4 three tests have 

been performed to investigate plant performance with presence of non

condensables in the primary system. 

The investigation of the influence of non-condensables on plant performance was 

considered to be meaningful, because accident scenarios exist where nitrogen or 

hydrogen accumulates in the steam generators and reduces heat transfer to the 

secondary side. Nitrogen may be expelled by the accumulators in the cause of an 

postulated Large Break Loss-of-Coolant Accident. It is dissolved in the primary 

system coolant, in the liquid of the refueling storage tank, and accumulator liquid, 

or may be already present in the system during refueling. And hydrogen 

generated by metal-water reaction at the fuel cladding may accumulate in the 

steam generators during post-design accident scenarios. 

In the test series primary pressure (1 MPa) and power generation rate (2 %) have 

been kept constant whereas primary side inventory was different in each test. In 

Test B4.1 the primary inventory was 100 % and thus the influence of non

condensables on single-phase natural circulation was investigated. In Test B4.2 

the primary inventory was set to 85% which generated two-phase natural 

circulation. And in Test B4.3, by a further reduction of the inventory down to 35% 

the influence of non-condensables on reflux-condenser conditions was 

investigated. 

Descriptions of the PKL test facility and of experiment PKL III B4.3 is given in 

reference /l/through /3/ 

3.2 Initial and Boundary Conditions of the Test B4.3 

The test was initiated by a conditioning phase where the primary inventory has 

been already reduced, but no nitrogen was injected. 

The reflux condenser conditions resulted in an accumulation of liquid inventory in 

the hot legs and in the inlet regions of the SG tubes. In the hot leg a collapsed 

level of 1.2 m was observed. The collapsed levels in the tubes were 1.5 m. The 

swell level in the vessel was below the inlet junctions of the loop pipings. The loop 

seals were filled with water. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration Siemens AG - Power Generation Group (KWU) of a utility model or design, are reserved. 

L:\Kameripkl3b43_wr r5m3.2_my.doc 

H30-K5314 Bericht KWU. engl. 4.94 D

Page
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

With the secondary side pressure (and saturation temperature) given, the primary 

side pressure is a system response. The primary side pressure is established to 

generate the temperature difference, which is necessary for stationary heat 

removal. In the experiment under consideration the temperature difference was 

6 K. 

Based on a secondary side energy balance it can be concluded, that about 

460 kW are transferred to the secondary side. Consequently, the primary side heat 

losses are about 60 kW. On the secondary side there is a heat loss of 

approximately 10 kW per SG. 

The major parameters of the stationary conditions in the primary system are 

summarized in Table 3.1, the secondary side conditions are summarized in Table 

3.2. 

Primary Inventory 35 % 

Power 2 % (520 kW) 

Primary Pressure 1.0 MPa 

Core Outlet Temperature 453 K / 180 °C (saturated) 

Main Coolant Pumps not operating 

Pressurizer isolated 

Primary/Secondary Side Temperature Difference 6 K 

Tab. 3.1: Primary System Initial Conditions 

Collapsed Level in SG Downcomer 12 m 

Steam Line Pressure LBA 10-40 0.87 MPa 

Steam Line Temperature 447 K / 174 OC 

Feed Water Mass Flow LAB 10-40 0.05 kg/s / loop 

Tab. 3.2: Secondary System Initial Conditions 

3.3 Sequence of Events 

Test PKLIII B4.3 investigates the system's response to a succession of nitrogen 

injections periods into the primary system at various injection ports. In the course 

of the test the secondary pressure was reduced occasionally in order to 

compensate the influence of nitrogen on heat removal in the steam generators.

Siemens AG . Power Generation Group (KWU) 

L:\Karner\pkl3b43_wr_r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, transmission or use of this document or Its contents S not The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page9
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

The sequence of nitrogen injection periods and secondary side pressure 

operations is given in Table 3.3:

Time Event

0 - 3600 s 

(10990 - 14590 s) 

4870- 6310s 

(15860- 17300 s) 

6400 - 10000 s 

(17390 - 20990 s) 

10880 - 11180 s 

(21870 - 22170 s) 

14295 - 14595 s 

(25285 - 25585 s) 

14735 s (25725 s) 

16000 - 19600 s 

(26990 - 30590 s) 

(21430 s) 

22840 - 26440 s 

(33830 - 37430 s) 

27340 s (38330 s) 

(38990 s)

1. period of nitrogen injection 

0.25 Nm3 , 3600 s, HL 10 

2. period of nitrogen injection 

0.1 Nm3 , 1440 s, CL 30 

0.25 Nm3 , 3600 s, CL 30 

3. period of nitrogen injection 

0.25 Nm3 , 300 s, HL 20 

4. period of nitrogen injection 

0.25 Nm3 , 300 s, CL 40 

reduction of secondary pressure to .80 MPa 

5. period of nitrogen injection 

1.5 Nm3 , 3600 s, HL 10 

reduction of secondary pressure to 0.55 MPa 

6. period of nitrogen injection 

1.5 Nm3 , 3600 s, CL 30 

reduction of secondary pressure to 0.37 MPa 

End of Test

Tab. 3.3: Nitrogen Injection Periods and Secondary Side Pressure Settings 

The amount of nitrogen which is injected in each of the first four periods 

corresponds to the amount which is dissolved in the accumulator liquid. During 

each the fifth and sixth period of injection the full depletion of a accumulator 

gaseous inventory was simulated.

Siemens AG* Power Generation Group (KWU) 

L:\Kame'p4k13b43_wr.r5m3.2_my.doc 

H30-K5314 Bericht KWU, engt. 4.94 0

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 10
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

3.4 Phenomenological Analysis of Test Results 

This chapter analyses the phenomena which occurred during the test and 

describes 

- the effect on heat transfer in the steam generator during reflux condenser 

mode if nitrogen is present in the primary system, 

- the overall distribution of nitrogen in the primary system depending on the 

location of an injection 

- and the dependence on the primary to secondary side pressure and 

temperature difference. 

A detailed description of the test results will be given later in this report in 

conjunction with comparison to calculational results. 

The reflux condenser mode is characterized by counter-current flow of liquid and 

steam in the hot leg. If nitrogen is injected into the primary system, it is 

transported by convection (diffusion is not effective). At locations of lower 

temperature, such as the steam generator or reactor coolant pump, steam is 

condensed and nitrogen is subsequently accumulated. The quality of nitrogen is 

increased until the partial pressure of steam and its saturation temperature 

corresponds to the saturation pressure of the local temperature (e.g. secondary 

side). These conditions represent a thermal equilibrium, and no heat transfer or 

condensation occurs in such a passive area. 

The transition from an active heat transfer area to a passive heat transfer area is 

accelerated by the phenomenon that the inert gas is accumulated at the 

condensation film on the cooling surface. The density of the inert gas in this 

boundary layer is higher than in the center of the steam flow. For this reason the 

partial pressure and the temperature of the steam in the nitrogen enriched layer is 

lower than the average steam temperature and partial pressure in the steam flow. 

After the termination of the condensation the layer of accumulated inert gas is 

dispersed by diffusion. 

The distribution of nitrogen in the primary system depends on the location of 

injection. If a moderate amount of nitrogen is injected into a hot leg of the loop of 

the test facility, it is transported to the adjacent steam generator where an 

accumulation at the location of condensation takes place. A "region of inertness" 

or passive area is established. It proceeds from the SG outlet chambers and 

depending on the amount of nitrogen injected, can occupy the whole steam 

generator. If the hot leg is completely filled, nitrogen flows to the upper plenum 

and into the other hot legs. However under these conditions no permanent 

accumulation of nitrogen was observed in the upper plenum. The distribution of 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamer\pkl3b43_wrýr5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 11
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

nitrogen does not depend significantly on the injection rate but only on the total 

amount of injected nitrogen. 

If a moderate amount (0.25 Nm3 in 1h) of nitrogen is injected into the cold leg, 

under reflux condenser conditions it is accumulated in the adjacent pump, as heat 

losses dominate in this component and steam is accordingly condensed. If more 

nitrogen is injected or if the injection rate is high, nitrogen is transported via the 

bypass from the downcomer into the upper plenum and finally into the steam 

generators. 

The influence of nitrogen on heat transfer in the SG tubes can be compensated 

by lowering the secondary pressure or increasing the primary pressure. The 

resulting increase of temperature difference between primary and secondary side 

has a direct impact on heat transfer. In addition the partial pressure of steam is 

diminished via the accumulation of nitrogen. Therefore the concentration of 

nitrogen can be higher. By an increase of primary pressure the region of inertness 

is compressed and establishes thus a additional partial recovery of the heat 

transfer.

Siemens AG • Power Generation Group (KWU) 

L:\Kameripkt3b43_wr r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 0

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 12
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

4. Results of RELAP5IMod 3.2 Analysis 

4.1 Description of RELAP5/Mod 3.2 

The Mod3.2 version of RELAP5 has been developed within the Code Applications 

and Maintenance Program (CAMP). 

The code development has benefitted from extensive application and comparison to 

experimental data in test facilities such as LOFT, PBF, Semiscale and NRU. 

RELAP5 is a highly generic code, that can be used in both nuclear and non-nuclear 

systems involving mixtures of steam, water, non-condensables, and nonvolatile 

solute. 

A description of RELAP5/Mod3 is given in reference /4/. 

4.2 Description of Input Model 

The nodalization scheme is shown in fig. 4.1. 

The core area is represented by a single axial flow channel with 8 hydraulic volumes 

in the heated region. The fuel rod simulators are represented by 3 heat structures 

(HST-10421, HST-10422 and HST-10423) with different power generation rates given 

by General Tables 801-803. In the test facility the downcomer consists of two pipes. 

In the RELAP input they are modeled as a single pipe. 

Though being rather coarse, the modeling of the test vessel corresponds to the 

requirements of Test PKLIII B4.3, as the phenomena under consideration occur in the 

SGs and the loops, and as no core uncovery occurs during the course of the 

experiment. 

Each loop is modeled separately. The hot leg is represented by 13 hydraulic volumes. 

Three types of SG tubes with different lengths are modeled (18, 20, 22 volumes). The 

loop piping between SG and pump is represented by 16 volumes, piping between 

pump and vessel by 5 volumes. The modeling of the piping and the steam generators 

is sufficiently fine to allow an adequate representation of thermal-hydraulic 

phenomena relevant in the test under consideration. 

The pumps are represented by pump components; homologic data are used, which 

have been determined for the LOBI test facility. The cooling of the pumps is 

considered. 

The noding of the steam generator secondary side has 16 axial nodes in the riser and 

13 axial nodes in the downcomer. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamerkpk13b43_wr-r5m3.2-my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 13
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

The nitrogen injection is simulated at the hot and cold injection port of the 

emergency core cooling system. To consider the flow direction of these nozzles 

towards the RPV, the injection junctions are connected to the outlet of the 

volumes in the hot legs and to the inlet in the volumes of the cold legs. 

The input deck includes a variety of control variables (cv). The following table 

comprises control variables which are of particular interest for test PKL Ill B4.3. 

Total power cv 7900 

Drained mass of primary system cv 7500 

SG collapsed levels cvs 2103, 2203, 2303, 2403 

Smoothed levels in the SGs, calculated by a cvs 2110, 2210, 2310, 2410 

Lag component with a Lag time of 30 s 

Sum of the heat transfer in the short, medium cvs 7175, 7275, 7375, 7475 

and long SG tubes of all SGs 

Smoothed heat transfer in the SGs, calculated cvs 7176, 7276, 7376, 7476 

by a Lag component with a Lag time of 50 s 

4.3 Calculational Procedures and Boundary Conditions 

The post test calculation was started to reach steady-state conditions with a 

significantly reduced primary inventory. A calculation was made to meet the initial 

and boundary conditions. During the calculation 1491 kg of liquid inventory was 

drained from the primary system and the inventories in the SGs were adjusted by 

controlling feed water flow and secondary pressure. The calculation for steady 

state was stopped after 5000 s. At that time the thermal-hydraulic conditions have 

been almost stationary. 

As a boundary condition during the transient nitrogen was injected into hot legs 10 

and 30 and cold legs 20 and 40. These injection rates are shown in Fig. 4.2 and 

4.3. 

As the heat transfer in the SG depends on the pressure difference and is merely 

independent from the absolute pressure, during the calculations the secondary 

side pressure was used in correspondence to the experiment as a calculational 

boundary condition. The development of the secondary side pressure is shown in 

Fig. 4.4. 

Additional to these presumptions the input was fitted out with control variables to 

get the nitrogen accumulation and nitrogen flow in the primary system. Together 

with the heat transfer to the secondary side the results of the RELAP5/Mod3.2 

analysis were assessed against the experimental results. 

The reproduction, transmission or use of this document or its contents is not 

permitted whihout express written authoity. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamer\pk13b43_wr_r5m3.2-my.doc 

H30-K5314 Bericht KWU , engl 4.94 D

Page 14
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

4.4 General System Response 

The overall system response to nitrogen injection is depicted in Fig. 4.5 through 

Fig. 4.7. 

At first the measured system behavior is discussed. 

Fig 4.5 shows the pressure history of primary and secondary side. The pressure 

increase following the 1. period of nitrogen injection into HL10 (0 - 3600 s) is very 

moderate. The 2. period of injection into CL30 (4870 - 10000 s) has no effect on 

primary system pressure. The pressure increase during the 3. injection period into 

HL20 (10880-11180 s) is more pronounced than in period 1. At the end of 

injection period 4 the secondary side pressure is reduced for the first time and 

generates a simultaneous decrease of the primary side pressure. The subsequent 

injection period 5 with large amounts of nitrogen results in an continuous increase 

of primary pressure which was compensated at the end of this injection period by 

a further adjustment of the secondary side pressure. 

The pressure difference between the primary and secondary side results in a 

difference of the corresponding saturation temperatures, which determines the 

overall heat transfer. The history of calculated and measured temperatures and 

temperature difference is shown in Fig. 4.6 and 4.7. The initial temperature 

difference before nitrogen injection calculated by RELAP5/Mod3.2 is 4 K 

compared to 6 K in the experiment. The temperature decrease on the secondary 

side shown in the experiment during the first period is to be explained by a local 

effect (plume of cold water at the thermocouple). 

The temperature difference which is formed at the end of each injection period 

is summarized in the following table: 

The reproduction, transmission or use of this document or its contents is not 

pernitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

Siemens AG - Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kameelpk13b43_wrr5m3.2_my.doc 

H30-K5314 Bencht KWU, engl. 4.94 D

Page 15
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Experiment RELAP 

pre pressure post pressure pre pressure post pressure 

reduction reduction reduction reduction 

Initial Condition 6 K * 4K * 

1. Period (HL 10) 6K * 5K * 

2. Period (CL 30) 6.5 K * 5K * 

3. Period (HL 20) 8K * 7K * 

4. Period (CL 40) 8K 9K 7K 8K 

5. Period (HL10) 19K 23K 18K 25K 

6. Period (CL 30) 27 K 30 K 30 K 42 K 

• no pressure reduction performed 

Tab. 4.1: Measured and Calculated Temperature Differences between Primary 

and Secondary System in Test PKL III B4.3 

For the temperature differences shown in table 4, the primary temperature is taken 

from the upper plenum as calculated and measured, respectively, and the 

secondary temperature (for the calculation the same as for the experiment) 

Fig. 4.6) corresponds to the secondary saturation pressure. 

Injections of small amounts of nitrogen th into a cold leg do not affect heat transfer th 

to secondary side. For the 5" (hot leg injection) and 6 (cold leg injection) injection 

periods, heat removal was too small to generate a stationary condition. This non

equilibrium resulted into an almost constant pressure increase. At the end of each 

of both periods, secondary side pressure has been reduced in the experiment. 

The first temperature difference corresponds to secondary side pressure before 

reduction, the second temperature difference is the respective value after 

pressure reduction. As primary side pressure follows the secondary side pressure, 

the reduction of pressure in the primary system results into an extension of the 

volume of inertness (passive area) in the steam generators. Therefore the 

temperature difference between both systems is expected to be higher with a 

lower pressure level. 

In the following the RELAP5 results are compared to the measured values. 

During steady state (before injection of N into the system) RELAP5 shows a lower 

(50%) temperature difference between primary and secondary side (Fig. 4.7, 4K 

calculated by RELAP5, 6K measured), although the total heat transferred to the 

secondary side is calculated to be lower in RELAP5 than in the experiment 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration Siemens AG - Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamer\pkl3b43_wrjr5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 16
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

(440 kW vs. 460 kW). This indicates a small overestimation of heat losses on the 

primary side in the RELAP5 model. 

For the first period (nitrogen injection of 0,25m3 in 1 hr into HL1 0) RELAP5 

calculates a small response of the system behavior (AT increase by 1K to 5K); the 

measured system response cannot be clearly interpretated, because of the shown 

anomalies (Fig. 4.6) but indicates almost no increase of the primary temperatures. 

The RELAP5 results (AT increase) show that the decrease of heat transfer in 

SG 10, because of nitrogen injection, cannot be compensated completely by the 

remaining SGs (as in the experiment). 

Both the experiment and RELAP5 show almost no influence of the nitrogen 

injection of 0,25m2 N in 1 hr into CL30 on the system behavior during the 2nd 

period. 

In the 3rd period (0,25m3 N in 5min into HL 20) RELAP5 shows a similar system 

response to the nitrogen injection as measured (1,5K vs 2K). 

In the 4th period with 0,25m3 nitrogen injection in 5min into CL40 both RELAP5 and 

the experiment show no system response. Experiment and RELAP5 define an 

increase of 1K of the primary temperature after the depressurization. 

During the 5" and 6t' period of nitrogen injection, RELAP5 and the experiment 

show a continuous increase of primary pressure and consequently an increase of 

the temperature difference primary to secondary side, which are terminated by the 

secondary side depressurization. 

4.5 Steam Generator Heat Transfer as a Function of Nitrogen 

Distribution in the Primary System 

The distribution of nitrogen and its influence on steam generator heat transfer was 

analyzed. The heat transfer in the SG depends on the distribution of nitrogen in 

the U-tubes. 

In the RELAP5/Mod 3.2 calculation, the nitrogen accumulations in all relevant 

components can be shown using control variables. These control variables serve 

as a basis to analyse the nitrogen transport. The calculated nitrogen distribution is 

depicted in Fig. 4.12 through 4.37 in comparison to the experimental values. The 

nitrogen mass distribution of the experiment shown in the figures is estimated 

from the test report description. Additional the heat transfer of the individual SGs 

can be derived from the live steam flows, hence these values are proportional to 

the heat transfer, when the level in the SG secondary side is kept constant by the 

feedwater injection (see Fig. 4.38). The heat transfer in the SGs of the calculation 

was derived directly via the heat flux parameters of the U-tubes (see Fig. 4.39). 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights. including rights created by patent grant or registration 

Siemens AG - Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Karne rpk13b43_wrj5m3.2_my.doc 

H30-K5314 Bericht KWU. engl. 4.94 D

Page 17
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

Consequently the calculated heat transfer of each SG can be compared with the 

experiment. (Figures 4.40 through 4.43), based on the nominal heat transfer rate 

in one SG of about 115 kW. When the heat transfer declines in a SG by 

accumulation of nitrogen, the inertness is compensated by the increase of the 

steam temperature in the primary system, which leads to a better heat transfer in 

the SGs which are free from nitrogen. 

Fig. 4.37 confirms a good agreement of the integral nitrogen inventory in the 

system between experiment and calculation and the correctness of the boundary 

conditions. Differences between calculated and measured heat transfer can be 

explained via the calculated differences in nitrogen distribution. 

1s' Nitrogen Iniection of 0,25m 3 into the Hot Leg of Loop 10 in lhr 

The experiment shows the following: During the 1St nitrogen injection period 

(Fig. 4.2) the heat transfer in SG 10 decreased (Fig 4.40) from the initial value to 

20kW. The development of a passive area in the SG10 can be seen in Fig. 4.8 

and 4.9. The total mass of 0,3kg N injected is accumulated in HL10 and in SG10 

(Fig. 4.12 to 4.13). To preserve the total heat removal the heat transfer in the 

other SGs increased (see Fig. 4.41 to 4.43) without a pressure and temperature 

increase in the primary system (Figs 4.5, 4.6). 

RELAP5 shows the following: The heat transfer in SG10 decreased from 110kW 

to less than 10kW at 1200 sec (Fig. 4.40). This loss of total heat transfer of about 

100kW (compared to approx. 40kW in the test) cannot be compensated by the 

3 other SGs without a small temperature and pressure increase at the primary 

side (Figs 4.5, 4.6). The evaluation of the nitrogen distribution shows that less N is 

accumulated in SG1O compared to the experiment (Fig. 4.13). The increase of 

pressure in the upper plenum and at the SG outlet leads to oscillatory loop seal 

clearing (Fig. 4.44) and consequently to the N transport to the RCP 

(Fig. 4.15, 4.16). 

2nd Nitrogen Iniection of 0,25 m3 into the Cold Leg of Loop 30 in 1 hr 

The experiment shows no significant change of heat transfer in all 4 SGs 

(Figs 4.40 to 4.43) during the N injection. The nitrogen injected is accumulated in 

the DC only (Fig. 4.36). 

The RELAP5 calculation shows also no significant change in overall heat transfer. 

SG10 recovers slightly around 8000 sec to about 40kW heat transfer (Fig. 4.40). 

The nitrogen distribution calculated differs from the experimental results. RELAP5 

calculates a nitrogen flow to the UPL and closure head (Fig. 4.36), which is an 

indication of an underestimation of condensation in the pump region, resulting in 

positive pressure difference CL to UPL and closure head. 

The reproducion, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration 

Siemens AG - Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:t<arner~pkI3b43_wr-r5m3.2_my.doc 

H30-K5314 uericht KWU, engl. 4.94 D

Page 18
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

3rd Nitrogen Iniection of 0,25m3 into the Hot Leg of Loop 20 in 5 min 

The experiment shows a significant decrease of heat transfer in SG20 to 60kW 

(down from 140kW) (Fig. 4.41). This decrease is compensated by a permanent 

increase of heat transfer in SG30 from 160kW to about 230kW (Fig. 4.42). Beside 

short peaks, SG10 and SG40 remain unaffected. The nitrogen accumulates 

primarily in the SG20 and partly in the loop between SG20 outlet and loop seal. 

The RELAP5 calculation shows a much stronger decrease of heat transfer down 

to 0 in SG20 with a continuous recoverment thereafter (Fig. 4.41). SG30 and 

SG40 show an increase from 140kW to 160kW and a continuous decrease 

thereafter. SG10 shows a permanent increase of heat transfer from 40kW to 

130kW (no increase in the test). Fig. 4.23 shows that not all injected nitrogen is 

calculated to accumulate in the SG20, it partly flows towards the UPL. The 

amount of nitrogen in SG20 decreases continuously (Fig. 4.20), thereby causing 

an increase of heat transfer (Fig. 4.41). 

4" Nitrogen Iniection of 0,25m3 into the Cold Leg of Loop 40 in 5 min 

The experiment shows no significant change of heat transfer in any of the 4 SGs 

before the depressurization (Figs 4.40 to 4.43). The secondary pressure decrease 

leads to a temporary peak of heat transfer in all 4 SGs. The nitrogen is 

accumulated in DC region only. 

The RELAP5 calculation shows also no significant response of the system till the 

depressurization. Only SG20 shows a significant reaction during the 

depressurization. The nitrogen is calculated to accumulate first primarily in the DC 

and partly in the UPL. Thereafter it is redistributed from the DC region into UPL 

and the rest of the primary system (Fig. 4.36). 

5" Nitrogen Injection of 1,5m3 into the Hot Leg of Loop 10 in 1 hr 

The experiment shows no overall change in heat transfer during the injection 

period (Figs 4.41 to 4.43). SG30 shows a decrease and a consecutive increase, 

whereas SG40 shows in the same time period an increase and a decrease of 

heat transfer. The actual decrease of heat transfer by condensation in the U-tubes 

is compensated by a continuous increase of primary pressure and corresponding 

saturation temperature (Fig. 4.5). The nitrogen accumulates in all 4 SGs in 

parallel (Figs 4.13, 4.20, 4.27, 4.32). The pressure reduction creates similar 

reactions like in period 4. 

RELAP5 calculates a similar overall system response regarding the total heat 

transfer and pressure increase in the primary system (Fig. 4.5 and 4.40 to 4.43). 

SG10 looses completely its heat transfer capacity during the injection. SG20 

reaches full capacity (up to 160kW) again and SG30 and SG40 increase also their 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

Siemens AG - Power Generation Group (KWU) of a utillity model or design. are reserved. 

L:\Kamerýpkl3b43_wrr5m3.2_my.doc 

H30-K5314 Bericht KWU, engl 4.94 D

Page 19
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

heat transfer by 20kW. The nitrogen is calculated to increase in all 4 SGs similar 

to the experiment. 

6h Nitrogen Injection of 1,5m 3 into the Cold Leg of Loop 30 in 1 hr 

The test shows a strong decrease of heat transfer in SG30 at 2400 sec down to 

about 80kW. The other 3 SGs raise their heat transfer. The actual decrease in the 

condensation rate in the SG U-tubes is compensated by a continuous increase of 

primary pressure and corresponding saturation temperature. The nitrogen is 

accumulated in all 4 SGs in parallel (Figs 4.13, 4.20, 4.27, 4.32). 

The RELAP5 calculation shows a comparable result regarding the primary 

pressure response (Fig. 4.5). SG20 and SG30 have a higher calculated heat 

transfer compared to the test, whereas SG40 has a lower calculated value. The 

nitrogen is calculated to increase in SG20, 30 and 40 but remains nearly constant 

in SG10. 

Conclusion 

In this chapter we have discussed the nitrogen distribution in the PCL and the 

influence on the heat transfer in the SGs during the 6 nitrogen injection periods. 

Comparing the nitrogen distribution in the system between the experiment and the 

RELAP calculation significant differences were shown in the results. In the RELAP 

calculation, the nitrogen was accumulated at the measured locations but to a 

different amount. The U-tubes of the SGs were calculated to receive enough inert 

gas to influence the heat transfer as predicted in the experiment. 

The overall heat transfer response is predicted by RELAP5 in a similar way compared to the test. But differences are shown in the distribution of the heat 

transfer among the SGs. In the experiment the heat transfer differs from 60 kW to 

about 250 kW (Fig. 4.38), while in the RELAP calculation the heat transfer rate is 

at a uniform level near 150 kW, but for the SGs with passive areas (Fig. 4.39). 

4.6 Propagation of Nitrogen Concentration in the Steam Generator 

U-Tubes 

Based on the evaluation of the experiment for reflux condenser operation with a 

hot injection of nitrogen, in the course of this test a front of high nitrogen 

concentration is formed in the SGs, which moves through the SG from the outlet 

chamber to the inlet chamber. An indication for this movement is the 

measurement of fluid temperatures in the SG tubes (see Figs 4.8 to 4.11), 

because steam temperature in this region decreases according to the partial 

pressure. In the evaluation the presence of nitrogen in the U-tubes of the SGs has 

been verified in this manner. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for Siemens AG -Power Generation Group damages. All rights, including rights created by patent grant or registration (KWU) of a utillity model or design, are reserved. 

L:\Kamer\pk13b43_wrjr5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 20
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

As described in chapter 4.5 the heat transfer in SG 10 and SG 20 did not exactly 

correspond with the prediction of the experiment. These SGs were effected by hot 

leg nitrogen injection during the periods 1 and 3. In the experiment they showed a 

constant heat transfer of about 10 kW resp. 60 kW after the 3rd injection period 

(Figs 4.40, 4.41). In the RELAP analysis, SG 10 was activated again when 

nitrogen was injected into the hot leg of loop 20 and the heat transfer in SG 20 

collapsed totally. Later on, in SG 20 the heat transfer increased continuously to 

about 150 kW after the termination of the 3rd nitrogen injection. 

This calculated increase of the heat transfer in the RELAP5/Mod 3.2 analysis is 

not shown in the experiment and should be analysed closer. As the phenomena in 

each U-tube are similar, only results of the longest tube of SG 10 and 20 are 

presented here. 

When condensation takes place in the U-tubes, heat is transferred to the 

secondary side. Another criterion for heat transfer is the temperature difference 

between the steam in the U-tubes and the secondary side of a SG. In figures 4.8 

through 4.11 steam temperatures and secondary side temperatures are depicted 

for the ascending and descending U-tubes. The temperature differences confirm 

the heat transfer shown by the steam condensation in the figures 4.49 and 4.50. 

Furthermore the temperature differences between the saturation temperatures 

and the steam temperatures in figures 4.8 through 4.11 indicate the presence of 

nitrogen in the U-tubes as predicted in the experiment. 

Figures 4.49 and 4.50 of the RELAP calculation show the generation of 

condensate in the respective SG for the ascending and descending U-tubes. As 

predicted in the test, the condensate generation in the descending part decreased 

earlier than in the ascending tubes, caused by concentration of nitrogen during 

condensation of steam and by the flow of nitrogen from the ascending part to the 

descending part together with steam. 

At 1000 s, generation of condensate in the descending U-tubes of the SG 10 

(Fig. 4.49) has been stopped totally by reaching a saturated state of the mixture. 

At 4000 s in SG 10 the nitrogen inventory in the descending part decreased while 

it was constant in the ascending tubes (RELAP calculation, Fig 4.17). The reason 

for this behavior shows the integral nitrogen flow at the inlet and outlet of pipe 320 

(RELAP calculation, Fig. 4.18). Nitrogen that flowed to the loop seal (RELAP 

calculation, Fig. 4.14) has been withdrawn from the ascending U-tubes. The same 

behavior of the RELAP calculation showed SG 20 at 11500 s (Figs 4.24, 4.25). 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including nghts created by patent grant or registration 

Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

LI\Kamerrpkl3b43wr_r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 21
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Therefore the heat transfer behavior calculated by RELAP5 of SG10 and SG20 

after nitrogen injection into their corresponding hot legs can be explained by the 

nitrogen transport out of the SG U-tubes into SG outlet and the adjacent loop. 

In the experiment the nitrogen obviously remains in the U-tubes of the affected 

SG (see Figs 4.13, 4.14 and 4.20, 4.21).

Siemens AG - Power Generation Group (KWU) 

L:\Kamer\pkl3b43_wr r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights. including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 22
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

5 Conclusions 

The PKL Ill test facility simulates a typical 1300 MWe pressurized water reactor of 

Siemens/KWU design. In Test B4.3, the influence of non-condensables on reflux

condenser conditions was investigated. 

This report presents a post-test analysis of PKL III B4.3 using RELAP5/Mod 3.2. 

A description of the input model is given, and the correspondence of measured 

and calculated results is discussed. 

The main findings of the comparison of RELAP5/Mod 3.2 results with the PKLIII 

B4.3 experiment are as follows: 

The general system response (pressure, temperature) of nitrogen injection in the 

primary system is calculated by RELAP5/Mod3.2 quite well. In a detailed 

evaluation RELAP5 calculates a non conservative behavior of heat transfer for 

small nitrogen injections effecting a particular SG. This statement can be 

concluded from the course of the heat transfers in the SGs 10 and 20 ( see 

chapter 4.5 and 4.6).Thus a too large calculated heat removal from the primary 

system underestimates the effect of nitrogen on the emergency core cooling in 

loss of coolant accidents. When the steam flow of the reflux condenser operation 

is terminated in a SG caused by inertness, less nitrogen of the injection is 

transported to the SG U-tubes. For this reason first a smaller nitrogen inventory in 

the U-tubes of a SG has been calculated to accumulate as predicted in the 

experiment and later on the nitrogen has been calculated to leave the SG 

(chapter 4.6). 

Looking at the figures of the transient, it is shown that RELAP calculates small 

fluctuations which transport nitrogen in the system without physical background. 

In a long term behavior, because of this numerical instability RELAP will predict 

a homogenous distribution of the nitrogen in the primary system. 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for damages. All rights. including rights created by patent grant or registration Siemens AG • Power Generation Group (KWU) of a utiIlity model or design, are reserved. 

L:\Kamer\pki3b43_wr_r5m3.2_my.doc 

H30-K5314 Bericht KWU , engl. 4.94 D

Page 23
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

References 

/1/ K. Umminger et al 

Station Blackout Experiment in PKLIII Test Facility and RELAP5/MOD2 

Analyses 

ICONE-3, Kyoto Japan, April 1995 

/2/ P. Weber et al. 

PWR-Related Integral Safety Experiments in the PKLIII Test Facility 

SBLOCA under Beyond-Design-Basis Accident Conditions 

NURETH-7 Saratoge Springs, USA. Sept 95 

/3/ B. Schoen, P. Weber 

Large Scale Experiment on Two-Phase Flow and Heat Transfer with 

Nitrogen in a Steam Generator under SBLOCA Conditions 

Int. Symposium on Two-Phase Flow Modelling and Experimentation 

Rome, Italy, Oct. 1995 

/4/ Idaho National Engineering Laboratory 

RELAP5/MOD3 Code Manual 

NUREG/CR-5535 INEL-95/0174 Vol. I - VII

Siemens AG - Power Generation Group (KWU) 

L:\Kamerkpk13b43-wr-r5m3.2-my.doc 

H30-K5314 Beoncht KWU, engl. 4.94 D

"The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utfllity model or design, are reserved.

Page 24
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted 

List of Figures 

Fig. Text 

2.1 View of PKLIII Test Facility 

2.2 Cross-Sectional View of a PLK Ill Steam Generator 

2.3 Axial Locations of Thermocouples in SG tubes 

4.1 Nodalization of the PKL III Test Facility with Respect to the B 4.3 Experiment 

4.2 Nitrogen Injection Rate into Hot Legs 10 (X) and 20 (- -) 

4.3 Nitrogen Injection Rate into Hot Legs 30 (X) and 40 (- -) 

4.4 Secondary System Pressure RELAP (X), Experiment (+) 

4.5 Primary Pressure RELAP (X), Experiment (Z), Secondary Pressure RELAP (+), 

Experiment (Y) 

4.6 Primary Temperature RELAP (X), Experiment (Z), Secondary Temperature 

RELAP(+), Experiment(Y) 

4.7 Temperature Difference Primary-Side - Secondary-Side RELAP(X), Experiment(+) 

4.8 Fluid Temperature SG 10, Ascending U-tubes RELAP(X), Experiment(+), 

Level 0.3m, Saturation Temperature Secondary Side(Z), 

Saturation Temperature Primary Side(Y) 

4.9 Fluid Temperature SG 10, Descending U-tubes RELAP(X), Experiment(+), 

Level 0.3m, Saturation Temperature Secondary Side(Z), 

Saturation Temperature Primary Side(Y) 

4.10 Fluid Temperature SG 20, Ascending U-tubes RELAP(X), Experiment(+), 

Level 0.3m, Saturation Temperature Secondary Side(Z), 

Saturation Temperature Primary Side(Y) 

4.11 Fluid Temperature SG 20, Descending U-tubes RELAP(X), Experiment(+), 

Level 0.3m, Saturation Temperature Secondary Side(Z), 

Saturation Temperature Primary Side(Y) 

4.12 Nitrogen Mass Loop 10 Hot Leg + SG Inlet 

4.13 Nitrogen Mass Loop 10 Steam Generator U-tubes 

4.14 Nitrogen Mass Steam Generator 10 Outlet to Half Loop Seal 

4.15 Nitrogen Mass Loop 10 Half Loop Seal to RPV Inlet 

4.16 Integrated Nitrogen Injection Loop 10 Hot Leg(Z), SG-Side(X), RPV-Side(+) 

4.17 Nitrogen Mass SG 10, Pipe 320 Ascending(X), Descending(+) U-tubes 

4.18 Integrated Nitrogen Mass Flow SG 10, Pipe 320 Inlet(X), Outlet(+) 

4.19 Nitrogen Mass Loop 20 Hot Leg + SG Inlet 

4.20 Nitrogen Mass Loop 20 Steam Generator U-tubes 

4.21 Nitrogen Mass Steam Generator 20 Outlet to Half Loop Seal 

4.22 Nitrogen Mass Loop 20 Half Loop Seal to RPV Inlet 

4.23 Integrated Nitrogen Injection Loop 20 Hot Leg(Z), SG-Side(X), RPV-Side(+) 

4.24 Nitrogen Mass SG 20, Pipe 420 Ascending(X), Descending(+) U-tubes 

4.25 Integrated Nitrogen Mass Flow SG 20, Pipe 420 Inlet(X), Outlet(+) 

4.26 Nitrogen Mass Loop 30 Hot Leg + SG Inlet 

4.27 Nitrogen Mass Loop 30 Steam Generator U-tubes 

4.28 Nitrogen Mass Steam Generator 30 Outlet to Half Loop Seal 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamerkpkl3b43_wr_r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

Page 25
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

4.29 

4.30 

4.31 

4.32 

4.33 

4.34 

4.35 

4.36 

4.37 

4.38 

4.39 

4.40 

4.41 

4.42 

4.43 

4.44 

4.45 

4.46 

4.47 

4.48 

4.49 

4.50

Siemens AG - Power Generation Group (KWU) 

L:\Kamer~pkl3b43-wr-r5m3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 0

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a ability model or design, are reserved.

Nitrogen Mass Loop 30 Half Loop Seal to RPV Inlet 

Integrated Nitrogen Injection Loop 30 Cold Leg(Z), RPV-Side(X), SG-Side(+) 

Nitrogen Mass Loop 40 Hot Leg + SG Inlet 

Nitrogen Mass Loop 40 Steam Generator U-tubes 

Nitrogen Mass Steam Generator 40 Outlet to Half Loop Seal 

Nitrogen Mass Loop 4 Half Loop Seal to RPV Inlet 

Integrated Nitrogen Injection Loop 40 Cold Leg(Z), RPV-Side(X), SG-Side(+) 

Nitrogen Mass Closure Head and UPL (X), DC(+), LPL Core and Core-Bypass(Z) 

Nitrogen Mass Primary System RELAP(X), Injected Nitrogen Mass(+) 

Heat Transfer Experiment SGs 10(X), 20(+), 30(Z), 40(Y) 

Heat Transfer RELAP (smoothed) SG 10(X), 20(+), 30(Z), 40(Y) 

Heat Transfer SG 10 Experiment(X), RELAP(+) 

Heat Transfer SG 20 Experiment(X), RELAP(+) 

Heat Transfer SG 30 Experiment(X), RELAP(+) 

Heat Transfer SG 40 Experiment(X), RELAP(+) 

Collapsed Level Loop Seal 10 SG-Side RELAP(X), Experiment(+) 

Collapsed Level Loop Seal 20 SG-Side RELAP(X), Experiment(+) 

Collapsed Level Loop Seal 30 SG-Side RELAP(X), Experiment(+) 

Collapsed Level Loop Seal 40 SG-Side RELAP(X), Experiment(+) 

Collapsed Level RPV RELAP Core(X), DC(+); Experiment Core(Z), DC(Y) 

Condensate Generation SG 10, Pipe 320 Ascending(X), Descending(+) U-tubes 

Condensate Generation SG 20, Pipe 420 Ascending(X), Descending(+) U-tubes

Page 26
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Figures

Siemens AG - Power Generation Group (KWU) 

L:\Kamerkpk13b43_wr-r5m3.2-my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, trassttIssion or use of this document or its contents is not The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 27
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Abb. 2.1: View of PKLIII Test Facility

Siemens AG • Power Generation Group (KWU) 

L\Kamer\pk13b43_wrr5rm3.2_my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration of a u.tility model or design, are reserved.

Page 28
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

00 

E A

thermocouple SG tube

replacement bodies

Fig. 2.2: Cross-Sectional View of a PKL III Steam Generator

Siemens AG - Power Generation Group (KWU) 

L:\Kamer\pk13b43_wr.r5m3.2-my.doc 

H30-K5314 Bericht KWU, engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 29
Report-No.: KWU NDS1 /98/ E2041

Handling Restricted

Hohe [mm I

10310 

9975 

9635 

9300 

8965 

8625 

8 290 

6 700 

5000 

2880 

2 000 

1 300 

"700 

300 

150 

0

tf 

Etntfitf

Ebenez

MIA 

VJA 

VtA 

HIA 

G/A 

F/A 

E/A

D/A 

CIA 

B/A A/A

Austritt

Fig. 2.3: Axial Locations of Thermocouples in SG tubes

Siemens AG -Power Generation Group (KWU) 

L:\Kamer\pk13b43_wrjr5m3.2_my.doc 

H30-K5314 Bericht KWU. engl. 4.94 D

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration 

of a utillity model or design, are reserved.

Page 30
Report-No.: KWU NDS1 /98/ E2041 

Handling Restricted

Page 31

Fig. 4.1 :Nodalization of the PKL Ill Test Facility with Respect to the B 4.3 Experiment 

The reproduction, transmission or use of this document or its contents is not 

permitted without express written authority. Offenders will be liable for 

damages. All rights, including rights created by patent grant or registration Siemens AG • Power Generation Group (KWU) of a utillity model or design, are reserved. 

L:\Kamer~pkt3b43_wrr5m3.2-my.doe 

H30-K5314 Bericht KWU, engl. 4.94 D
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document Is subject to the restrictions 

set forth on the first or title page 25. 5.98 6:43: 3

DOKU.980513.1842.14668

Mass Flow (kg/s)

................ . ; .................. ................................ 

>- MFLOWJ911000000 +-I-+ MFLOWJ921000000 

.... ................. ......................... ... i ..... .. ..................

0.0010

0.0008

0.0006•

0.0004

0.0002

0.0000o

Depress. dp 

N Injection

0 2 4 6

1. h. leg 10

8 10 12

2. c. lea 30

*1r I .S . 1 1 I -, 

14 16 18 2 

Time(s) 11110 

d dp

3. h. le 20 4. c. lea 40

22

5. h. len 10

24.. .26 

dp

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.2: Nitrogen Injection Rate into Hot Legs 10(X) and 20(--)

0 

z

U.UU I4

2I 28 "*103

............................ 

............

........................... 

.................. 

............ .............

........... ....................... 

...................... ........................... ................. 

........................ ........................... ..............

I

S.... !................ .... .

........ ...... .... 

.. . .. .. . .. . .. . ... . . 

....... ........... 

.. ... ..............

S........................... i... ........... .. . . 

S... ...... .............. . ..................... 

S............................ ..................... 

X 

S........................... ......................

" ................. 

.. ....

..........

X- M 2) CD =~ -o CL 0 

~RZ 

0 

iJ. 

(D 

o 

0 C 

CL z 

"U 

M 

.0 

-U

S...........................

.................. 

.......... ..................

.. ..... .. ......... 

"'i................ ........... .......... .................... 

. ........................... . ................. ..... ... .. ......

..................... 

................

i
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25. 5.98 6:43: 4

DOKU.98051 3.1842.14668

Mass Flow (kg/s) f(i AA 0 TU.UU I " ]

0.0010

0.0008

0.0006

0.0004

0.0002

0.0000

Depress. dp 

N Injection

i ! i [ X----X MFLOWJ863000000 I 

i i ii i i -l----+ MFLOWJ873000000 

.. .... .. .. ... . ............ 

.. ....... . .. ..... .... ... ......... .. .. . .. .. . .. ....... .. . 

. ... .. .. ... .. . . ... .. . . . . . . . ......... ....... .............. ............. 

.. . . . .. ... . . ............. . .. . . ................... .... i ..+ ... ............. ..... ...................... ........ ....... .. ... ..... .... .. .... .. ..... .. ...... ... .. .. .......... 

I I /i

",I I I I " 4 I6 I ' I I I 0 2 4 6 8

1. h. leq 10

1i0

2. c. le.q 30

12 141 16 18 2 

Time.s) s• )'p - p dp

3. h. leg 20 4. 0. leo 40 5. h. leo 10

22 24 26

dp 

6_ c. l•.n 30

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.3: Nitrogen Injection Rate into Cold Legs 30(X) and 40(- -)

U) 

0 

z :D C. 

CD 

(') 

M.% 

CD 

CL

C1 (D 

0 0 

0 

z 

0 

m 

0

......................... ............ 

..................... ........................... ...................... ...... I ............... ......... 

........... ........................... ........................... ........................... ...... 

................ ............ .................. 

................ .................................................... ........................... 

................. ........................................ ...........................

28 *103

(0 

CD 

Wj 

CO,
Dieses Blatt unterliegt den WeitergabebeschrAnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:43: 4

z 

D)

0

Depress. dp 

N Iniection 1. h. I

2 4 6 8 10 12 141 

Time_ s) 

leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40

DOKU.980513.1842.14668 

SPressure (Pa) 

2 .0 ...... ..... 

1 .8 . .............. 

1 .6 . .......................... ................................ 

1. *106 

1 .4 . ........................... .......................... .... 

1.2. . 

1.0. 

0.8 . 

0.6. 

0.4

0 .42 ........................... i .............................. 

0 .2 , ,...., . 

0.0-

212' 1 '214 ' 1 '216' 1 '218 

dp 

6. c. leg 30

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.4: Secondary System Pressure RELAP(X), Experiment(+)

..........................

"2" 

a- 0 

= D ;: ;ý 

(R0 

DO :. 

C: 

CL 0 

m 

0( Q-

................. .......................... 

............

*103

..........

.. .... .. .. ........ .. ........ ........... . ..... --- -

................... .• ........................... • ..................... ...... ' ........................... ............ ........................ ! .......... .• ..... . .....

S. . . . ............. . . . ............ .............. ................ .. . . . . . . . . .... . . . . ............ ...... ............................. ............. . .

............. .......... ........................... 

....................................................................... 

............... 

............ ................................................

16 18 2 

dp 

5. h. leg 10

I I I I i I I , I I I I - - - - l I I F -I '

T

X-XP74001000 

SP_ 737 

........... ....................................... i ......................... ............ .......... ........................... 

S............... .................... .. ............................ .................... ................ ........... . ......................... . 

... .. .. .... .. .. ... ....... ... ............ ......................... . ..................... .. .. ............ ............. . 

............... ......................... i ..................... ............... ....i .......................... .. ................ -U 

(0 

CD

.............................. 

..............................
Dieses Blatt unterliegt den Weitergabebeschr&nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:43: 5

U) 

0 

z

DOKU.980513.1842.14668 

Pressure (Pa) 2 .0 - ............... ..... ...................... ............. ........................ ...... .......... ...... ... . ........ ..... 

1 .8 ........... .. ... .. .. .... .. ............ ........................ ........... ... .. ..... ...... ... ........... 

1 .6 . .. .. ................................ .................. .............. ........................... ,. ......................... .. ...... ..... ,1.6 

1 .4 ...... .................... ............... ............ •. ......... ........................... ................................ ................ 

1.2 . ............... . ...................... .................................. 

1.2o 

0 .8 4........................... -. ..................... ........................... ....................... .. ....................... ............... 

0 .6 . ................ ......... . .... ... ...... .. . ... .... .. ...... " .. . ............ I ........... ..... i. ........ 

0 .4 . ............ .............. ........................... ........................... ............................ ............................. ................. 

0. ............... .... i............................. i.................... ................................ ................ 

0.0 . ,.-. , . i . , .

4 6 8 10 12 

2. c. leql 30 3. h. lea 20

i14 16 18 2@ 22 24 26 '28 

Time s) 0 " 

_dp dp dp 

4. c. leg 40 5. h. leg 10 6. c. leg 30

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.5: Primary Pressure R(X), Exp.(Z), Secondary Press. R(+), Exp.(Y)

z 

..... ................ ............................. ........................... 

T 

S........................... i. ..................... u ........................ . 

S............................ i. .................. ... . ....... 

'A

-I 

C

(D 

0)i 

CL

CD 

-o 

0 

z 

0 

C: 

z 

0• 

CO 

m OD 

0

Depress. dp 

N Injection

0 2 

1. h. leal 10

X-X P220010000 

+--±+P740010000 ............. .z_. 

Y-Y P737 

S........... ..................................... ............................ 

S........................... i........................... i ...................... ... 

... . ............ ............................ . ...........................

*103

" ..... ....... .............. 

S.................... .. . . 

L .......... 

_.- .....- .. .+

-U 

Co SD 

CA) 

01i

-.......... i ........................ -.- ............................ --_ .............. -- ---

I I
Dieses Blatt unterliegt den Weitergabebeschrtnkungen This document is subject to the restrictions 

wie auf Titelselte bzw. erster Seite angegeben set forth on the first or title page 25.5.98 6:43: 6 

DOKU.980513.1842.14668 = 

Temperature (C) ý 190 . ........................... i......................... .... ........... .......... ................ ............................................... i........................ ................... ............. f...................................... - .... ............................................. ..................... ....................... 0.. 

CD 

X--X SATTEMP22001 I, • 1 8 5 -. . .. ............... . .. . .. .. . .. .. .. .... ......... i . .... . .. ..!i . .................... ..... i................. .. .... ii . ... .................. ........... i.................................. .. .. .. .. .. .. .. " .. ........... 2 • ... .- .... . - -. \ . ........ .I.. +- - S A T T E M P 7 4 0 0 1 .i- -C 

180 ... -- --- .. .......... Y TEMP 146. 

! .. ...... .. .... . ... : .. 

.. .... ...................... 

1750 ......................... .•...--. ................ , ...................................... ............................................................ ....................................................... ............... ,................... . 

1 "17"1+ 7 .'.¥...... .. t...... ..... ! ............................. ...................... " -f + -' 

1 0 .............. ........... ..... •............... ... . .................. ... ..... .................... .............. .......... .. ........... ...... ........ -+ . 7 7 .. .'... ... ................................... . : . i . •. ............................ ........... 

YuY 

1 65 0... .... .................................. f.... ....................... i... ..................... . . .......... ..... •....................... .: ............................ • .................. r 

.................... .............................. ...................... ..... ........................ ........................... ........................... ........................... .i ......... ....... ... ..... ... 

145 ......... ........................................... ................................... , .......... ............... .................. 1 4 0o .. .................... ............... ... ............ .... ............... ........ .......... .......... ... . ..................... .... ........... ............. ........ ............ ... .... . ................. ......... ...................... ... ......................... ........................... ....................... ... 

0 2 4 6 8 10 12 114/ 16 18 2ý 22 24 26 8 - 103 

Depress. dp Time ds) p . " 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 .5. h. leg 10 6. c. leg 30 

Comparison of Experiment and Analysis PKIL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.6: Primary Temperature R(X), Exp.(Z), Second. Temp. R(+), Exp.(Y)
Dieses Blatt unterliegt den WeitergabebeschrAnkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 25. 5.98 6:43: 6 

SDOKU.980513.1842.14668 Q 0 z C ; 0 

• Temperature (K) .. 6 0o .................. ........................ ..................................................... ............................... ........................... .......................................... .......................................... ................... .......................... ............................. -............. • 

55D 

5 5 . .. ........ .. .. .... .......... ........................ ... ....................-. ................ .................. ............................. .. ... ....... ... ............... .. ............................................. ............................ .... ................. ...................... .. ... .... 60 z 

5 0 . ............................... ................. ........................... •............................ .................... ... ........................... ........................... .................. ........ ..... *.............. ..... .... .......... .. ........................ ....... i.. ..... .. ...... ........... U 

4 5 - ............ 

m 

4 0 -......... ........................ .................... ....................... ...................... .... ..... ...........: ... ..... ........ .... .... . .. .........................-........................... 

40 - . o 

3 0 -........................... ........................... ........................... ......................... ......... .... ...... .............. ...... .... ........................... ........................... ...................... .. ... .... ........ .. .. ................. ... ........... ................................. ........... 

3 5.... .. ........ 

2 5 .. . .. . .. ... . .. . .. . .. . ... . .. . .. ... . .. . .. . . ........ ............. ............ -• .. . .. ........... ...................... , .. ........ 

2 0 ............ ............................. .....................

5 '" .............................................. ' ...... ...;.............. .. .................................................... ........................... .............................. ................... ....................... .. ..... ... 

0 2 4 6 8 10 12 141 16 18 2ý 22 24 26 28 "103 

Depress. dp Time (p) NoI, - - -- p dp dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4,7: Temperature Diff. Primary-S. - Secondary-S. R(X), Exp.(+)
Dieses Blatt unterliegt den Weitergabebeschrtlnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document Is subject to the restrictions 

set forth on the first or title page 25.5.98 8:40:29

z :D

. 2 

1. h. leg 10

4 8 10 12 

2. c. leg 30 3. h. leg 20

Time ('s) 

4. c. leg 40

16 18 2? 22 24 26 

dp dp 

5. h. leg 10 6. c. lec 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.8: SG 10 Asc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

DOKU.980513.1842.14668 

Temperature (C) 

) (-)<TEMPG32001 

1 9 5 . .......................... .• ... ........................ ......................................... i. .......................................... ............................ i.............. ............. • ............. , ...................... ........................... Z.... • .Sz_ A T -T E M P 7 4 0 0 1i .. 

190 ""Y Y SATTEMP20001 

1 9 0 ................. .J -. ........................ ... ... ... ... ................ .... ... .... .. .... J f,. .......... ..... .... .....T.. ... ... ..... ... ... .. .... ........ .............. .. .. ... ... .. . 

1 8 .... ..... .... .... ............. ... ..... .... .. .. .. ....................... ...". ...................... ...................... ............ .......... .............. • ............... ,........... ..................... .......................... .................................. i... .......... Y.... ... .... 

1 8 0 -.................... ...; ............... ................................ ......... ....... ............................ .. ....... ....... ........ .. ..... ......... ...... .. ........... ............. ..... ...'. 

180 ~ ~ ~ ~ ~ ~ ~ ~ ~ ~. ..................... ... ................ "."-: "•• ,•N i; ................... ;4 OP! 

1 7 ": .......... . . , ,.' , : -- -.- " ,' ' ..........................- ....... .................... ...................... i..... .... .• ' """ ' ................. ........ , •.•............. ................... i • ........... ... 

1 .6 ....... ................ .......... ....... 

1 6 ........................... ................... ... ............... ........... . ....... .. ............ ... • .. ................. •.................... ..... • ............... • ....-.. --.......... •.• ..-..... ...-.. z .....-..... -. ., ........... ........ i. ....................... ........ 1 5 5 .......... ...... ,.. .. .. .. .. .. .. ....... .. ... .. .. .. ....... .. .. .. ... .. .. ... .... .. .. .. .... .. .. .... .. ...... .. .. .. .. ... ........ ......... .......... 7 -. , 7 7 . 

165......................... ....... .......-...... ............................ 170

160-. 

155 

1 5 0 - . , ....... I I ' , ' I ' , I I I I , , ' r • ' , ' • ' ' T h I '

"Q-r 

0D 

Q. 

JJO 

Co 

C'_

CD 

O _0 

0 

C: 

z 

CD 0O 

m 

0

Depress. dp 

N Injection

CA) 

cx3

*103
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 8:40:30

DOKU.980513.1842.14668

Temperature (C) 2 0 0 ................. -............................................................. .......... 

1 9 5 . ................................. .................. ................... ....... .................. ..... 

1 Ia ." . ............................. ...................... I ........................................ ..

1. h. leg 10 2. c. leg 30

0 12 14ts Time s) 

3. h. leg 20 4. c. leg 40

16 18 2T? 

dp

5. h. lea 10

dp

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.9: SG 10 Desc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

Uo 

z

I (0 

CL 

CD, 

CD CL

C 

z 

0 

U') 

c 

z 

00 

M, 

-tA

185

180

175 

170

165 

160 

155 

150

Depress. dp 

N Injection

-0 

SD 

CO, cr0

"*103

5. h, lea 10 6 r Inn .10
Dieses Blatt unterllegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page

z

Depress. dp 

N Iniection

0 2 4 6 8 10 12 

1. h. lea 10 2. c. lea 30 3. h. lea 20

Timet) 

4. c. lea 40

DOKU.980513.1842.14668 

Temperature 2 0 o0 (C) ... .... ............ ...... .: .......... .............................. 

1 9 5 ............................ ................... .. ............... ...... 

1 9 0 ............................ ........................... .......................... 

1 8 5 .......... .. ..... . . .................. ........ ...,, " 

1 - - -- z- - -- z- - - -Z 

1 7 0 . ........................... ........................... ............................ 

1 6 5 . ........................... ............................ ........................... . 

1 6 0 . ................... ....... ........................... ...... ................ ... 

1 5 56 0........... . ............. ............................ 

150-

S. .................................... ............................ ........................... ............... ......................... ......... ........ .......................... 

, .. .• ... .. : --.,.............. .. • , ...... / •...... . . ... •....... ...... .... :' .. .. ....... ............. 

I III IIIi I 

................... ............ A ........ .... ... .1.. ..... 

........................... .. . . .. . .. . ... . .. . .. . ... . . .. . . .. . . . . . .. . . . . . . 

............... .. ......... .... ..... ......... ...... .. ......... ... .... ................ ....... 

--- - .....- .. --.....--..".-.- .. .... ...... ....---. .. .'.. ..... .........'.. .... ............ ...... 

.. ....... ............... ............ .. .. ... .. .. ..... .. .. ... .... ..

16 18 2T 

dp 

5. h. lea 10

S....... ................ i ........................... T ..... ....... ... 

X-- TEMPG42001 i-t-- -+ 

Z -Z SATTEMP74001 

Y Y SATTEMP20001 

.. .... • ........................ . ......... . . 

.. ............................ ' .i i' " " -i . . . .. .. . . 

- t

',- 'z4' . - I. . . ... .. .. . 

"............... # .... ...... 

Z ' I ' I ' ! I

22 24 26 1 

dp 

6. c. leg 30

28

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.10: SG 20 Asc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

. I.......... 

..... ..... 

a: w 

0.. 

CD, 

C

{0.

CD 

0 

z 0 

z 

Co 

m 

0) 

A

CD "4t. 

o

"*103 I

I ................1.F~

I

25. 5.98 8:40:25

÷ ................. .
Dieses Blatt unterliegt den Weitergabebeschr~tnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25. 5.98 8:40:26

C') 

0

S. ............. .......... .... .............. ........... " XXTEMPG42018 

ZZ SATTEMP74001 

Y Y SATTEMP20001 

S............ ................................. ............................ .................. .. ...... .

DOKU.980513.1842.14668 

Temperature (C) 

200 ........... 

195. 

1 9 0 . ........................................... 

1 8 5 - ........... ...... 

1 8 0 . ......................... ................ Z Z 175.-' 

170

1 7 0 . ...................... ..... .... ...... .. .. 

1 6 5 . ............................................ 

160. 

1 5 5 ............................ ........... 

150-. . I 

0 2 

Depress. dp 

N Injection 1. h. leg 10

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.11: SG 20 Desc. U-Tubes R(X), Exp.(+), Satt-sec(Z), Satt-pr(Y)

4 6 8 10 12 14 16 18 2 22 24 26 128 

Time ýs) _o 0 dp dp 

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30

5.Q 

(0 

CD 

C,.

0 

z 

C: 

z 

0, CO 

m 

01

o0

"*103
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page

DOKU.980513.1842.14668 

Mass (kg) 0n ; n ...............................................

0.45

0.40

0.35-

0.20

0.15

0.10.

0.00 

Depress. dp 

N Iniection 1. h. leg 10

S.......................... . . .

S............................ ........................... ,............. .

6 8 10 12 141 16 18 

Times Do 

dap dp 

2. c. leg 30 3. h. leg 20 4. c. leg 40 5 Sh.ieg 10

24 26 28 

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.12: Nitrogen Mass Loop 10 Hot Leg + SG Inlet

U) 

0 

z

Co 

CD 

CD CL

(D 

0 

0 ;il. 

z 

0 

OD 

z 

(0 1,0 

m I', 

0

. 

. ...

*103

.......... .... .. 

................ ...................... ...................... 

................................ .......................

I

25.5.98 7:18:11

........... ....... 

. . 

... 

. . 

RELAP

S................. ,............. .............. ÷ ........................... 

.. ......... ...... 

.. ..... .. .... .. ......... ....... 

... ...... 

.. ..... ... .. .. ........ 

.. ... .......... ...... ..... 

.. ...i. .. ................. .... 

i . .

CD 

I\)

............. ........... 

..... ... ......... 

... ... ................. ... ... .................. 

........................ ........................... 

.......................................J. 

....................... ................... 

. ... ... .... .. .... ... ... ... .. . ... ... ... ... ... ... .... .. . . 

............

..........

.... ... ... ... .... ..... .. .... .................... 

. . .......................
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:28

z DOKU.980513.1842.14668 

Mass (kg) 

1.0 .............. 

0 .8 .................. .................... .. 0.8. 

0.6. 

0.4. 

0.2 

0.0- r i 

0 2 

Depress. dp 

N Injection 1. h. leg 10

16 18 2b 

dp 

5. h. leg 10

*103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.13: Nitrogen Mass Loop 10 SG U-Tubes

2. c. leg 30 3. h. leg 20 4. c. leg 40

D 

0.. CD 

CL

JJ 

CD X 

-C3 

0 

C 

z 

COr 

m 

0

Co 

5D 

4h.
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:28

DOKU.980513.1842.14668

11' ,I ,1 1 ,'18 2 1 

Time (p) -- dap dlp

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10

*103

dp 

6. c. leq 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.14: N Mass SG 10 Outlet to half Loop Seal

z CL 

M. 

CD 0L

CD 

0 

z 

0 

U) 

00 

cim 

m

Depress. dp 

N Injection 1. h. leg 10

-U 

(03 .C.

......................... ........................... ........................... ............................... 

........... .............. ..... ............ ..... ... .. 

......................... ..................... ............................ ............... ........
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25. 5.98 7:18:28

DOKU.98051 3.1842.14668

6 8 10 12 141 

I_ Time_,S) 

2. c. leg 30 3. h. leg 20 4. c. leg 40

Comparison of Experiment und Analysis PKL Ill B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.15: N Mass Loop 10 half Loop Seal to RPV Inlet

t

Depress. dp 

N Injection

Z 

Q~0 

0 CD Z 

C0 

m 

0 

4-U 

CD 

01

*103
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:47:58

DOKU.98051 3.1842.14668

Mass (kg)

U e- 1+ 0 IU 1/ I18 2yi 22 24 26 !

TimedS)

1. h. tea 10 2. c. leo 30

dp

3. h. lea 20 4. Ien4fl I, Ion IA

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.16: Int. N Injection L. 10 Hot Leg(Z), SG-Side(X), RPV-Side(+)

U) 

0 

z

2 . ....................... 

2 .0 . ........................ 

1.5 

1.0 

0.5 

0.0 

-0.5 

-1 .0 .- .............

9') 

0~ Co 

CD 

CL

(D 

_0 

0 

z 

K,) 

(0 

C/) 

0

I I -

Depress. dp 

N Iniection

S............................ ............................. ............................ ............................. ............................. ...... ...................... ................................ ......................... .] ...................... .............................. .. ................. ........................... !.. .... ..... .... 

X--X CNTRLVAR8001 

/ - -- -F---+ CNTRLVAR8003 

S........................... ........................... ............................ ....... ... . .... ............ O W J O . 

.. ... ............................................ .... .......................... .....i ................. ................. ..................................................... ........... .. ....... .. //./ Z MLOJ1 

........................ + ...... . ............... 

+- -I- ± 

---- --- ----- - -- - -

J .. ............................I ...................... ............... .. .. ............................ I.. ............................ .... .......... 

.................. ............... ... ...... .. .......... ...................... ............ + .-...... ... - : • = = ..' , .... ....... .... ... .... ...... ................................ ..... .......... ........................... .. ......... ................... 

.•~~.............. ................... ................... ................... ........ ,....P.alc.at .. .............. .......... o n. 

T -" r --- . .. .-, -

28 *103

dp

-V 

CD 

0, 0)

- I
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:48:44

DOKU.98051 3.1842.14668

Mass (kg) 

0.09-1

0.08 

0.07

1. h. leg 10

0.06 

0.05 

0.04 

0.03 

0.02 

0.01 

0.00 

Depress. dp 

N Iniection

6 8 10 12 14 ) __ __ _ Times) 

2dp 

2. c. leg 30 3. h. leg 20 4. c. leg 40

dp 

5. h. leg 10

dp 

6. c. lel 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.17: N Mass SG 10, Pipe 320 Ascending(X), Descending(+) U-Tubes

i) 

0

(0 

(D 

CL 

CD 

o9.

(D 

_0 

z 

C 

z 

(0 

OD 

m 

N) 

0•

"-4 

CD 

4T-

*103

A .......... 

.............................. ........................... ............................ .................. 

.................... ........................... ........................... 

.... . ... .... .. ... ... ........................... ....................... .................. 

. ... . . ... ... ... ... ... ... .... ... . ........................... ....................... ............
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:48:56

KU.980513.1842.14668

2 4 6 8 10

2. c. leg 30 3. h. leg

12 T1e s 

Tim24ceg) 

20 4. c. leg 40

1'6 ' 1'8 ' '2 

dp 

5. h. leg 10

DO 

z

22 I .2 14 - I 2 16 1 '2

dp 

6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.18: Integr. N Mass Flow SG 10, Pipe 320 Inlet(X), Outlet(+)

..... ............................ ............................. , .................... ... 

S........ •........................... i.......................... .... .............. 

............................. ..... i ............ .. ......

CL 

13 

CD 

(0 

CD 

CL

CD 

0 

z 

0 

Cn 

C') 

m 

0

0.05 

0.00

Depress. dp 

N Injection 1. h. leQ 10

.................................................................................

*103

S........... I...... ............... . . ........ Z............................

- v

"" ? .................. ......................... i.. ........................... ....................... ............................ ............... ............ [ ...

X-X CNTRLVAR8010 

4---+ CNTRLVAR8016 

..................... ..... . - .÷ ..... ... ... .. 

.......................... ........................... C V. ......................... ........................... 

RILkAP Calculation !

-C 0)2 

CoB 

C°

..,,, .............
Dieses Blatt unterliegt den Weitergabebeschrinkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 25.5.98 7:18:29 

n DOKU.980513.1842.14668 ,C z CL 0 

Mass (kg) ( Z 0 .5 0 ................. ................. ........ ....................... ................ ............................ ................. ..................................................................................................................................................... . CD 0 .4 5 ........................ ....................... ............................. ........................... ..... .............. ............................. .. ........................ ... ..... .... ... ........... ... ... .... ................. ....... 0.50 

CO 

CC) 0.35 ................................................................................................................. "...... . .

0.30. 0 . ......... ... .. ...... .. ... .. ... ... .. ... ......... ... ... .. ... ... .. ... ... .. ... ..... .. ... .. ........ .......... .. ... ... .. ... ..... ... ..... ... .. ... ........ .. ... ...... ... ........... ... .. ... ... ...i .. ... ..... ... ... .. ...... .. ... .. ... ... .. .. . ... .. ... .. ...... ......... ... ... .. ..... . .. ... .. ... ... .. ..... 

0.25 -. . : 

.............. ..... .. . . ......... ............... 

0 .2 0 ............................................................... ......................................................... ........................... 

0 .1 0 ................................. . ............... ................... ....................... ............................ ................. -.............................. ........................... ...................... ........ • ......................... ..... ... ..... ...... .... ............. .. ........... 

0 0 ................ .... ... ........ .............................. ........................... .......... .... ................. .. ....................... ...... ..... ...... ...... . ( 0.05 • •• , • •• , ............. • ....................... •..... ................... .; ................ ........... e 

S i i RiELAP i, Experimnent: no N'Acoumulation •4 

0.15K e 

0 2 4 6 8 10 12 141 16 18 2ý 22 24 26 J 28 "103 

Depress. dp Time () Idp - d dp dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.19: Nitrogen Mass Loop 20 Hot Leg + SG Inlet
Dieses Blatt unterliegt den Weitergabebeschr-nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:29

DOKU.98051 3.1842.14668

Mass (kg) 

0.8

0.6 

0.4 

0.2

0.

Depress. dp 

N Injection

.... ........................... { . .................... ... ........ ................... .

S ' I ' ' ' I '' ' ' I 

2 4 6 8 10 12 141 16 18 Timeis) - D

dp ) dp 

1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10

"*103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.20: Nitrogen Mass Loop 20 SG U-Tubes

z

"Z3 

5.. 

Co 

CD 

CL

CD 

0 

z 

0 

C 

OD z 

4o 

m 

0 4:.

.f..

.................. ........... ................ ..........

............ 

............ 

............

..................... ...................................................... 

................................................ 

... .. ... .... ... ... ... ... .. ... .... .. .... .... .... .. .... .. ... ... .... .. . .

... .. .... .... .. .

"-u 

Co 

0'1 0
Dieses Blatt unterliegt den Weitergabebeschrinkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 25.5.98 7:18:29 

-r 

DOKU.980513.1842.14668 ". 0 

z 0- 0 

3ý Mass (kg) (a Z 0 .5 0 .............. ........... :........................... .......................... ......................... .............................................................. .................................................................................................................... .................... CD 

(D z 

0 .4 0 . .......................... ............ ...................... . .. ... . ..... ................................. ......... ........... ....... ... .. ... ......... ... ... ......... .............. .....".... .... ....... ..... ......... ... ... ....... ....... ... ......... .... 

0.453 

O0 

0 .3 5 - .............. .. ....... .... ............... I .............. ........................... .............................. ............................ ...................... ........................... ........................... ........................... ........................... .......................... . i m 

0 .3 0 ......................... ........ ........ .. ... ............................. .... •. ... ................. ............... ...... .......... ................. ..... ........... ... .. .... .. 

0 .2 5 ......... ....... ......................... ... ...... ... .... ..... . .. ..... ... .... .. ....... . ... ... .... .. .. .. ... .. .. ............................... . . .. ... . . .. ... . . . .. . .. .. . .. . .. .. ... . ... .... . ...... . ..... . ..... ... ............................... .... ... 

0 .2 0 . ....................... .. .......................... :............................. . .. ................ ............................... ........................... ........................ ........... ............... ........................... ... .... . ....................... ..... .. .. ... .... .. 

0 . 1 .... . ...... ...... ...... . ...................... .... .......................... 

0 . 0 .... ... ....... ...... .. .. .... .. I....... ..... ... .......................... T..................... ... ................ .... I................. .......................... .. .. .... ..... ...... ....................................................... . ............................ ........................... ............................ 

i ! / 1• i i Exper rhent "1 

0.0 ................................................................................. ............... .......................... 

0.35 . . . .. i" mii C, 

0.00 

0 2 4 6 8 10 12 14/ 16 18 2ý 22 24 26 28 *103 

Depress. dp Tie p• dp dlp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.21: N Mass SG 20 Outlet to half Loop Sea[
Dieses Blatt unterliegt den WeitergabebeschrAnkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 25.5.98 7:18:30 

a: M 

Cl) D CD DOKU.980513.1842.14668 a "0 Dz =' 

Mass (kg) • z 0 .5 0 . ............................ ........................... ............................ ............................................... ............. ............................ ............................................ ... ........................... .................................... ........... ........................ ..................................... P. . 

0 .4 5 . ............ .. .. .. .. .. .. ...... ............................... ....................... .. ... .. .. ..... .. .. .. .. .. .. .. .... .. .. .. .. .. .. ......... .. .. .. .. ...... .. ... .. ..... ...... .. .. .. .. .. ......... .. .. .. ... .. .. .. .. .. .... .... .. .. .. ..... ...... .. .. .. .. .. .. .. .. .. .. ... C 

CL 

0.45 

OD 

0 .3 0 . .......................... ." ............................ : .............. .. .... ÷ .... ............. ......................... ............................ .............. .. .......... ........ ....... ................ ...... .. .................. ... ... ...... .. .. ... ..... ...... .. .... ... . ........ .... .. 

0 .2 5 . ...... .. ............. .. . ................ ............................ ..• ........................... ................... ... .......... .... ...... ... .... ....... .. ............. ..... .. ....... .... .... ...... .. ... ...... .... ...... ...... ... .... ....... .. ...... ... ...... ..... .. ....... .. ...... ... ..... 

0 .2 ................... ....... ................... .. ................. .................................. ............................. ........................... ......................... ..... ........ .......... .... .............. .............. ... ........... i. ... .......... ... ....... ... . 

2 "103 

0.2543- RLP/Md. N ~~~~~~~~ 2. c. 0 .c e 4 ~~~. ,h l@1 .necio ......... .... l 3 .eg .. .e.03.h.. 

0.10 N Loop .2 ... ........................... 

Experiment 

0.00 . .X )I 

Ders~p 0 2 4 6 8 10 1'2 .T.m. 16 1 2 1 2 12 2 14 2 16 2 8 *103 

d dp dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment und Analysis PKL IIl B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.22: N Mass Loop 20 half Loop Seal to RPV Inlet
Dieses Blatt unterliegt den Weitergabebeschrt.nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25. 5.98 7:47:58

DQKU.98051 3.1842.14668 0) 

0 

z

16 I ' 18 I , ' 1 ' 

dp 

5. h. leq 10

22 24 S26 I 28

dp 

6. c. leg 30

0 2 4 6 8 10 12 141 

Depress. dp Tim s 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40

Comparison of Experiment und Analysis PKIL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.23: Int. N2 Injection L. 20 Hot Leg(Z), SG-Side(X), RPV-Side(+)

Mass (kg) 

1.0

0.8

CL 

(D 

"(0 

(I,. 

:3. 

0 

CL

0.6

0.4

0.2 

0.0-,

C: 

z 

0 

(D 

m 0a o

X-X CNTRLVAR8022 ----+ CNTRLVAR8024 

: .: . . Z Z- Z MFLOWJ20 

S.... ...................... .............................. ........................... .......... ................ .T....... ...... ........ .. ........................ .•...... . ......... . ..... ....... . .... ..... .... ...... .. . .......... 

++ 

............... .. ...... ..... .. .................... ......... ' .............. .............................. ............................. i .................. ..... .. ............................. ................i . ............... ........................... .. 

................. .. .. ,..........f.. ....... ......................... ........................... P Co..........n.................i............................ i...... ....................................... 

RIELAP Calc~lation i

"-0

.. .. .... . .. .. 

............. ....... ...... ............. ..........
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:49:19

DOKU.98051 3.1842.14668

1. h. lea 10

i • I'i --' I' i ' ri' ' I ' I ' ' i I ' i It 6 8 10 12 14| 16 18 

Time •s) -- ,

- _ dp 

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10

*103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL IIl B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.24: N Mass SG 20, Pipe 420 Ascending(X), Descending(+) U-Tubes

C-) 

0 

z

Mass (kg) 

0.09-.

C1 

9.. 

Co CD 

CD 0-

a) 

CD -a 0 

z 

z 

CD 

0 

Zý

Depress. dp 

N Iniection

"(0 

CD 

(3'

SV

• . . ............................ ... . . . .............. . .. ............... •..... 
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document Is subject to the restrictions 

set forth on the first or title page

0 

Z

1842.146 

.. ) ..........

....... . ......... -.... .... ,• 

......... .. . . .. , .. ..... .. .... .,4 , .. ,... .... '. -...'.. ................ ...................... . . . . . .

DOKU.980513. 

Mass (kg 

0.15 

0.10 

0.05 

0.00 

-0.05 

-0.10 

-0.15 

-0.20 

-0.25 

-0.30

0

Depress. dp 

N Injection 1. h. leq 10

SI ' . I I ' I ' 

4 6 8 10 12

2. c. leg 30 3. h. leg 20

Tim dp 

4. c. leg 40

.... .. ........... . . . . . . . . . ... . .... i - - -.. ..-.... .., . ... ......... 

S. ..................... . . ........................................ .. . .... . . . . .. .. . .. . ... .€ ....... ........ 

... .................... .................. ...... .... ... ............... t ... ý& ....... ........ . 

S........................... • .... ................ . ............................ .......... .. •l k"' ' 

.. ................................................ ..! ................... .................. .. 

PtLAP Ca6cu61t0o 

i m ,mlE 

16 18 2T 

dp 

5. h. leg 10

22 24 26 1 

dp 

6. c. leg 30

28

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.25: Integr. N Mass Flow SG 20, Pipe 420 Inlet(X), Outlet(+)

2

CL 

CD 

0 -3. 

CD 

CL

CD M 

10 

0 

C 

z 

0, 

mf) 

o OD 

Oo 

Nm

°, 

01 

01

"*103

25. 5.98 7:49:19

S........... ............... " ........................... . .................... ............................... ............................ ........................... f" ................................................... ... ".......... ............... 

.................... .................... .................... ..................... .................... .................... 

......................... .. ..... ...................

I ' I '
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:30

z

Depress. dp 

N Injection

0 2 

1. h. leq 10

4 6 8 10 12 

2. c. leq 30 3. h. leQ 20

141 16 18 2ý 22 24 26 i28 

Time (s)NO 

dp dp dp 

4. c. leg 40 5. h. leg 10 6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.26: Nitrogen Mass Loop 30 Hot Leg + SG Inlet

0) 

0~ 

CD 

0-

M CD 

-0 

0 

z 

0

DOKU.980513.1842.14668 

Mass (kg) 0 .5 0 .......................................................... ..... ..................................................... .......... ................ ............................. ....................................................-....................... .. .......... ............................ .......................................................... 

0 .4 5 . ........................... ............................. ....... .................. .. .... ............... .. .. .. .. ... ... .. ... .. .... .. .. .. .. .... .. .. .. .... .. .. .. .. .. .. .... .. .. .. .. .... .. .. ... .... .. .. .. .. ........ .. .... .. .. ..... .... .. .. ... .. ..... .. ... ... ... .. .... .. ... .. .. .. .. .. 

0.40 .' 

0 .3 . .......................... ............................ ........................... ............................ ................... ....i. .... .. ............. :. ............. .. 0 .4 .. ........... ........... .. ... . ................... •.. ............• ..............[ .............. 

0 .3 0 .................. ..................... .... ..... .................................... ......................... .............................. ......................• ....................................... .. i ......................... .. ......... ........ ..................... .................... ... 

0 .2 0 . ........................... ........................... ........................... ......................... .... ..... ...................... ........... .. . " ........... .... !............................. .......... ..... ............... . .......... ..... ..,................ ......... ..................... ....... 

0 .1 5 .................. ..................................... ... .................................................... ................... ....... ...... ......-.-...... ............................... ........ .......... ...... ................. ....... ....... .......... ........ ...... ........... ...... ... 

0 .1 0o ............. .......... ....................... .. .... .............. ... ... .. ..... .............. ............................. .............. ............. ............. ............ ......................... ....... .......... ....... ...... .. ...................... ...... ................ .... 

.. ...... ...... .. ... ... . .. ... . .. .... . . .. ....... 

i ! RELAP ii ! Experlmdint: no N Abcumulatioih 0.00 

0.30, ' q '" '; •>, c x 

0.25i ' ' • ' I

*103

(D CA 

0)
Dieses Blatt unterliegt den Weitergabebeschrdnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:30

£/ 

Z DOKU.980513.1842.14668 

Mass (kg) 

1.0.

0.8 

0 .6 . .......................... ................ 

0.4. 

0.2. 

0.0 

0 2 

Depress. dp 

N Iniection 1. h. lea 10

14: 16 18 2T 

Time (ds) 0 . 

4. c. leg 40 5. h. leg 10

*103

dp 

6. c. leq 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.27: N Mass Loop 30 SG U-Tubes

2. c. leg 30 3. h. leg 20

0.. 

CL 

CD 

CL

CD 

-0 

0 

z 

0 

CO 

m 

0 4M

"13i 

4o "4D
Dieses Blatt unterliegt den Weitergabebeschr•nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:30

U) 

0 

z

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.28: N Mass SG 30 Outlet to half Loop Seal

DOKU.980513.1842.14668 

Mass (kg) 

0.40 

0.35 

0 .3 0 ............................................ 

0 .2 5 ............... 

0 .2 0 .............. 

0 .1 5 . ................... ................. 

0 .1 0 . .......................... 

0.05 .......... 

0.00 : , 

0 2 

Depress. dp 

N Injection 1. h. leg 10

0~ 

53. 

Co 

(D 

CL)

'0 

0 

z 

C/) 

(0 

m 

0.

-U 

SD 

00i

*103

Comparison of Experiment und Analysis PKL III B 4.3 

Data b43 -- RELAP5/Mod3.2 

Fig. 4.28: 

N Mass 

SG 30 Outlet 

to half Loop 

Seal

i............................z..................... . ............................................... ...... i ............................ i ........................... i 

.................... ............. ......... ............. ....................
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:31

ci) in 

z

Depress. dp 

N Injection

3.1842.14668 

g)

DOKU.98051 

Mass (k 

0.50 

0.45 

0.40 

0.35 

0.30 

0.25 

0.20 

0.15 

0.10 

0.05 

0.00

0 2 4 6 8 10 12 

1. h. leg 10 2. c. leg 30 3. h. leg 20

QOýMWW* 141AK'~hM 16- 18

.141 , I 1 6 ,118 2 1 

Time(s) W 

__p dp 

4. c. leg 40 5. h. leg 10

........................... 

........................... ........................... ............... . 

....................... ......... ............................ 

........................... ........................... ........................... 

............. ........................... 

........................... ............. .................. ........ 

........... ............ ............................ - - ........................ 

..................... ........................... ................. 

LAP 

........................... ..................... 

................. .. .................... ..... .........

2 24 26 I 

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKIL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.29: N Mass Loop 30 half Loop Seal to RPV Inlet

S.. . ...... . ..... ......... ... .. ............ i. . . .. . .. .. . .. ............................ ............................ ........................... i"......................... ....... .................. ................. 

................. .................................. ............................. ......................................................... .. 

. ........................... ........................... ,............................................... ............................ ........................... ............................ ,...... ........ ......................... 

............................ ............................ ........................... ........................... ............ ................ ........................... ........................... ........................... .................. 

............................. ....................... ...... ..................... ..... ...............................

CL "71 53. 

CD) 

C.

C 

z 

m 

z

S........................... i 

S..................... . . .i 

S........................... 

S......................... .I 

S...........................

•103 2; L

........................... .... ......... ............ 1- --- .................... ................... I- -......................... ....................... --

S........... {.................... ....... 

S........... .................... .......

CD 

(0 CD 

0Q 

01
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:47:59

DOKU.98051 3.1842.14668 z

26 1

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data M4_3 -- RELAP5/Mod3.2 

Fig. 4.30: Int. N Injection L. 30 Cold Leg(Z), RPV-Side(X), SG-Side(±)

i

"I" 

0

5. 

(D C. Z3. 

a 

CD 

0.

(D 

_0 

0 

0 

z 

C 

m. 

m\ 

0o

Depress. dp

N Iniection 1. h. leg 10

S............. .......................... ........................... ............................ i........................... i...................... 

.. ... ..... .. ..... .. ...................

28

... ............................ ...... .. ............ ....... ............................ 

)(-X CNTRLVAR8042 

4---+ CNTRLVAR8044 

Z-Z MFLOWJ30 ij............................i ............................ ii ........................ ......... ............. .i 

'/' 

/ i.......... ................. ........................... .. ...... . 

... .... ... ...... .... ...... .... ................... .. St! 

RtLAP Calculation 

. . . . . . . . ..

0 0,
z

Depress. dp 

N Injection

erliegt den Weitergabebeschr~nkungen 

bzw. erster Seite angegeben 

.1842.14668

This document is subject to the restrictions 

set forth on the first or title page

Dieses Blatt unte 

wie auf Titelseite 

DOKU.980513. 

Mass (kg) 

0.50

0.45 

0.40

0.35

0.30 

0.25

0.20

0.15

0.10

0.05

0.00-

0 2 4 6 8 10 12 

1. h. leg 10 2. c. leg 30 3. h. leg 20

Time_•s) 

4. c. leg 40

25.5.98 7:18:31

......................................... ....................... i .................. ....................... ....................... ................... 

.. .... ....................... .................. ........... ..... ...... .............................. ........................... ...... .... ... .... .. . 

.. .. ....... ..... .. ... .. .. .... ... .. ... ...... .... l .. .. .. ..

I - I I I 1 1 16 18 2? 

dp 

5. h. lea 10

S........................... ........................... ............................ i ...... ..... .. ........................ .... i......... ......... ....................... ............................ 

S........................... ........................... ............... ........... ........................... i...................... .. ... ..................... i ...... .................................... 

........................... ........................... i ......................... " ........................... 1......................................... ........................... 1 . ........................... 

" ................. ........... ..................... ... i........................ ............................. i. .......... .. ..... .. ........................ ....... ...... ... .... .. .............. . 

S.......................... ........................... ........................... ........................... .......................... .............................. •............................ ........................... 

S. ............. ................... ............• ............................................................. ............. i.............. ........ ...... .. ... ..................... 

RELAP

I ' 1 ' I ' 1 , J -T' I22 24 26 1 28 

dp 

6. c. leq 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.31: Nitrogen Mass Loop 40 Hot Leg + SG Inlet

XI

"l-I 

CL 

CD 

-I 

0.

CD 

-0 0 

z 

z 

0 

.° 

CC 

!; 

MO

-C

"*103

S.................................. ...................-....... • ............ ............. 1 ...................... .................... 1.......................... ........................... r ............................ ....................... .............. . ........... I
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:32

DOKU.98051 3.1842.14668

0.8.

0.4

0.2

0.0

Depress. dp 

N Injection

6

1. h. leg 10 2. c. leg 30 3. h. leg 20

Time js) 

4 dp dp 

S hr Ig~n 10

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.32: Nitrogen Mass Loop 40 SG U-Tubes

z

"I 

(D 

CD 

CL

:1) 

CD 

'0 

0 

C 

z 

(', 

(0 

m 

o' 

0

.. .. . . ..... ............ .. .............. .. . .. . . ...... ... z.. . . 

.. . . . . . . . . . . . . ....................... 1 ............. . . . . . . . . . .

"*103

dp

............

4 c Ian 40 5 h le 10

. . 

.. ...... 

.. .........

. . 

....... 

.. ..... ..

-u 

CD 

CF)

......... ........ ..... .............
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:32

DOKU.980513.1842.14668

Mass (kg) 

0. 50Q

1. h. leg 10 2. c. leg 30

Depress. dp 

N Injection

0 12 141 Tim es) 

3. h. leg 20 4. c. leg 40

dp 

5. h. leg 10

2'8 -103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL Ill B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.33: N Mass SG 40 Outlet to half Loop Seal

U) 

z

"-rJ 

2) CD •. 0 

0D . 

C 0 

CA) (D z 

m 

"0 

CA)
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:32

DOKU.980513.1842.14668

0 2 4 6 8 10 12 14| 

Time 

1dp 

1.h.iegl10 2.c.Ileg 30 3. h.leg 20 4. c. leg 40

22 24 26 28 -103

dp 

5. h. leg 10

dp 

6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.34: N Mass Loop 40 half Loop Seal to RPV Inlet

(z 

Z

"I

0~ 

9. 

C•

"DO 

(,D 

0 

z 

0 

Cl) 

OD 

m 

0o

Depress. dp 

N Injection

-D 

Co (I, 

0)

i

.. .................. -........................ ............... ...... .... 

.. .............. .............

. ... .. ... .... . .. . . . . .. . . 

... .... .... . .. .. . ... ........ 

.............. .......................

............... .......... 

....................... 

......................... 

.....................................

................................................ .......................... 

............ .............. 

........................................................ ......... ... .i .............. .......... 

................ ............. 

............... ....................................... ........................ 

............. ..........

.. i 

. i. . .. . . . .

.......... 

..........

.... .. ..... ............................ i............................ 

.........~~ ......... .~. 

~~~~ . . ....... . . ... ... .. .. ... .. .. .. .. . .. . ... . . . . .. .
Dieses Blatt unterliegt den Weitergabebeschrcnkungen 

wie auf Titelselte bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:47:59

DOKU.98051 3.1842.14668

Mass (kg) 

0.35 -.

Depress. dp 

N Iniection

24 6 8 1 ,0 1'2 1 '4 

Time 

1dp 

1. h. lec 10 2. c. lea30 3. h.Ileq20 4. c. lea 40

... ....................................... ............................ ......................................................... . ...... ............. ! ......................... 

X-. < CNTRLVAR8064 

- - -- -- + + CNTRLVAR8066 

.................. ....................... ........................... ....... .. Z................. Z Z M F L O W J 4 0 

...... .. . .... .. . . ....... . . : ... .. ......... .. ....... .

I I ' I ' I ' I 

16 18 2? 

dp

5. h. lea 10

*103

dp 

6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.35: Int. N Injection L. 40 Cold Leg(Z), RPV-Side(X), SG-Side(+)

z

a 

CD 

(D~ C. CD a

,-a 

C: 

Z 0 00 

M N 

C,i, 

m 

0

"(D 

0) 

01
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document Is subject to the restrictions 

set forth on the first or title page 25.5.98 7:18:57

DOKU.980513.1842.14668

Mass (kg) 

1.0-,

0.8

1. h. leg 10 2. c. leq 30 3. h. leq 20 4. c. lea 40 5. h. lea 10 6. c. lea 30

0.6

0.4

0.2

0.0-:

Depress. dp 

N Injection

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.36: N Mass Closure Head and UPL(X), DC(+), LPL Core and Byp.(Z)

0. 

3. 

Co_ 

CD Q.

CD DO 

0 

0 

0 

C: 

z 

(0 

m 00 M

"Cl 

0)

*103

........... ..................... ..................... .......... ................. ....................... .......... ............................
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:19:1

z) 

0 

z

0

Depress. dp 

N Injection

DOKU.980513. 1842.14668

Mass (kg) 

6.0 

5.5 

5.0 

4.5 

4.0 

3.5

3.0 

2.5 

2.0

1.5

1.0

0.5

0.01-

2 4 6 8 10 12 

1. h. leq 10 2. c. leg 30 3. h. leg 20

' '4 1 

Time ) 

4. c. leo 40

16 18 2? 22 24 26' 

dp dp 

5. h. leg 10 6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.37: N Mass Primary System RELAP(X), Injected N Mass(+)

S.......................... . .. . .. .. . . .... . ............. .......... • 4 ..... .................... ....................... .i ............... ......................... ... ........ ..... i ..................... ..... 

S.......................... •-.......... .............................. "/........................ i ................................. ........... ,......................... ............................ 

........................... •,................... ......................... ,•........... ......... ..... ....................... ........................... ,•.. ............................ ...................... 

"".. .. ... .... .. ..... ..... ... .. .... .... ... .. ........................... .............................. ... . ................. .................. . . . .. . . .. .. . . . . . . . . 

.......... 

... ................. t............ .. ........................... ...... ! ..................... ............................ ........................... ...... ...................... ...........................

T

:3. 

CL 

CD 

(n) 

CL 

a"

X (D 

C 

09 

z 

0

-u 51) 

(0 CD 

0) -4

*103 [
Dieses Blatt unterliegt den Weitergabebeschrinkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:55: 4

z DOKU.980513.1842.14668 

Power (kW) 

3 0 0 . .................... ................ 

2 8 0 . ................ .................. 

260 ....... 

2 4 0 . ...................... 

2 2 0 . ............................................ 

2 0 0 .................. 

1 8 o -................. .................... .. 

1 6 0 -. .............. .. .... .. .., '

180 

160-> 

140 

20 

60t 

2 0 . ...... ..... 

0 

0 2 

Depress. dp 

N Injection 1. h. leg 10

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/M0d3.2 

Fig. 4.38: Heat Transfer Experiment SGs 10(X), 20(+), 30(Z), 40(Y)

6 8 10 1'2 'm14: 1''16 -- 18 2T . 22 24 26 

__________Time0 

2s) 2 

-dp dp dp 

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30

CL 

(03 

CD 

CL

(D 0 

0 

C 

z 

C', (0 

m 

U) 

M

(C0 

OD

*103
Dieses Blatt unterliegt den Weitergabebeschrnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25. 5.98 6:43: 7

DOKU.980513.1842.14668 

Power (kW) 

3 0 0 .1 ......................... : .......... 

2 8 0 - ............................. 

260-1 

240 -1.. ....................

....,. ......... .... ....... ................................ i............................ ............ ,........... ........................ ; .... ... ... ...-. ... ........................ i.. ..................... ....... ."............. i........................................ ... ... 

....................... ............................................................... ................... ..... 

... ....... .... .... ... .... ... ................ S... ........ .T '' -, •' ........................... ... .................... ............................ . ........................... . ................. !. .. . ........... .............................

0 2 4 6 8 10 12 

1. h. leq 10 2. c. leg 30 3. h. leg 20

1 4 

Time ý,s) 

4. c. leg 40

16 18 2ý 

dp 

5. h. leg 10

-2 14 216.128 

dp 

6. c. leg 30

Comparison of Experiment and Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.39: Heat Transfer RELAP (smoothed) SG 1O(X), 20(+), 30(Z), 40(Y)

0) 

0 

z 

D

CL 

(0 

Ma MM 

o 

0 

0 

z 

z 

Nl) 

(0 m 

4\)

Depress. dp 

N Iniection

Co

*103
Dieses Blatt unterliegt den Weitergabebeschrainkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:55: 5

DOKU.980513.1842.14668

J 2 4 6 8 10 12 14ý 16 18 2 

Tim (s )_ _ 

1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leq 10

28 "103

dp 

6. c. leq 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/M0d3.2 

Fig. 4.40: Heat Transfer SG 10 Experiment(X), RELAP(+)

zD 

z

"CL 

(p CL

a] 

-a CD 

0 

z 

0 

C Z 

(0t 

m 

0

Depress. dp 

N Injection

"-.4 

0
Dieses Blatt unterliegt den Weltergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:55: 5

Cl: 

0 

z

Depress. dp 

N Injection

1842.14668 

V)

DOKU.980513. 

Power (kM 

300

280 

260 

240 

220 

200 

180 

160 

140

120 

100

80 

60 

40 

20 

0-

hir 

S.......... ....................... ............ ........... ............ ................ ............ j

S... . ..,.................................. ........... ................. ,, ......... ....... ............................ , , , , , ........................... S. ................ ... ........................... ..... ........... .... 

S. ....i................. . -......... ............................ ............................ ............. i ........................... t !.......................... ...................... 

S. .................. ........................... .......................... ............................ ; • • ; ................. ..... .... ........................... ,

0 2 

1. h. leg 10

S!I , I 

4 6 8 10 12 141 

Time s) 

2. c. lea 30 3. h. lea 20 4. c. lea 40

16 18 2 2'2 24 26 

dp dp 

5. h. leg 10 6. c. leg 30

Comparison of Experiment und Analysis PKIL III B 4.3 

Data b4_3 -- RELAP5/MOd3.2 

Fig. 4.41: Heat Transfer SG 20 Experiment(X), RELAP(+)

.......................... .? ................................................. • ................................. ............. .t . .. . .. . . .......... •.......................... .. . .. .. .. . .. . .! 

S.......................... ........................... i ........................ ..... . ..........i ............... ......... - i ......................... .. - ...... ............... ......... ...... 

...................... •............. ....... . . .÷ . . . . . . . . ......................... . . . ... . ... . . .. .. ... , .. . . . . . . . . ....... . . . . .. . . ........ ... . .. ... .. .. .. .. .. 

. ..... ........................ .M ,,,,• I • • .................. ...................... .... .......

CD 

"Cr" 

CD 

oo

M CD 

~0 

0 

z 

CD z 

m 

0•

"(0 

(D 

",4

*103

6. 1.. -... ... AL M..

Comparison und of Analysis Experiment PKL III B 4.3 

Data b4_3 -- RELAP5/M0d3.2 

Fig. 4.41" Heat Transfer SG 20 Experiment(X), 

RELAP(+)

...............- " ......
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page

DOKU.980513.1 842.14668

Power (kW) 

300] 

280 ........ 

260-.

240

220 

200

180

160

140

120

100-

80

60

40

20O

0

Depress. dp 

N Iniection

0 2 4 6 10 12 141 16 18 2ý 22 24 26 

Time s) 

1p dp dp 

1. h.leal10 2. c. leq30 3. h.lea 20 4. c. lecg40 5. h. lea 10 6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/MOd3.2 

Fig. 4.42: Heat Transfer SG 30 Experiment(X), RELAP(+)

0) 

0 

z

'3 

(. 

I 

(D 

Q.

(D X 

0 

0 

z 

m N) 

0

"-U 

(03 

(0 

"4)

25.5.98 6:55-:5
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 6:55: 5

0 Z DOKU.980513.1842.14668 

Power (kW) 3 0 0 . ............ ................... ............................................ ...................................................... .............. ........... 

2 8 0 . ............... ................................ .............. ..................... ... .. .. ................ ........ . .... .............. .. .... 

2 6 0 .......................... .................... ............... ........ . ............ ... .......................... ........ ............ .. 

2 4 0 ........................... • ........................... ........................ ... .......... ......... ...... ... ..... ............ ................... ... 

2 2 0 . .... .... ...... ................................. ........................... .,.............. ................. . .... ..................... ............... ..... 

2 0 0 . .......................... "................. ....................... ... ....... .................. .................... .............................. 

1 o8 .................... ...... ............. ....... ...................................... .. .......................... ... .... .......... 180 . . ....... 140 ............... 

0 .2 . ......... ................ . . .. .. .................... ............................ . . .. . .. .. .. .. .. .... .. . .. .. . .. . .. . .. . 

1 o 20 ........... ................ ........................ ... .............. .......... 

180.-• 

1 6 0 0 ............................ ............................ ........................... ........................................................ ............................ ... 

8 0 ................. ..... .. ..... . ... ............. .............. ................................................................ ............................. ..... 

2 ................... ........ ................. ........................ .............................. ............................. ........ .................... ...... 

2 0 . ........ . ........ .... ... I' .............. ....I 

60 

0 2 4 6 8 10 12 

Depress. dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20

...................... . . . . . . . . . . . .. . .. ............... . . . . K . . ..................... • . . ...... .. - ..... ... .... .. .............. .................. . ................ ...... 

S.................. .... :....... .............i.................... ........................... .............. I............................. .. .......... ...... .......... 

i i , I 

S..................... ......... ... ..... .. ...... ... ... .. .. .... .. ...... 

S....... ... .. ............................. ........................... ....... ' •' ......................... 

.............. ... ...... "i .. ......................... N o i n a f' o' r W ......ý . ............. 

",.,. .,.o.m ..lnal .,. Pow.er .. of . I& ..... ,.,.

S.................... .......................... .•........................... ........................... .. ........................ ............................ ............................. ............................ 

S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............. . . . . . . . . . . . . . ................................ .......... .................... ...........................I . ......... ... .....

1 ' I ' I, ' 16 18 2 

dp 

5. h. leg 10

22 24 26 

dp 

6. c. leg 30

"*103

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/M0d3.2 

Fig. 4.43: Heat Transfer SG 40 Experiment(X), RELAP(+)

Tim4. 

4. c. leg 40

M. W) M CD 

(D Z 

O0 

-,4 

W) 

--4 

(0

J • v v
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:19:1

DOKU.98051 3.1842.14668

Collapsed Level (m)

- +CL_544 

"IIJ 

... .... ...- -+ +. ---. + - .... . 

LJ.. , 1. A. i lJ Ib~ll/, All :1.• hJ l ,1

S! I I ' I • "I I ' I' I ' 

0 2 4 6 8 10 12 14T S) 

Depress. dp _ _ _ Time 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leq 20 4. c. lea 40

*1' I *I' I 'I' I 'lF

16 18 27 22 24 26 

dp dp

5. h. lea 10 6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.44: CL Loop-Seal 10 SG-Side RELAP(X), Experiment(+)

z 

:D

6 . ................... .... ,, 

5 

43 . ..... .............. i 

3 

2]

'I 

0. 

CD 

CL

Di (D 

0 

0 

z 

03 

C4D 

m 

r%3 ........... 0 oP

.. .............. ........ ............. ........... .....

1

CD "-13

28 *103

i

..........

................. ................. 

................. ................

.......................... ............ ................ ............ ...........

.................
Dieses Blatt unterliegt den Weitergabebeschrankungen 

wle auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:19: 1

DOKU.98051 3.1842.14668

Collapsed Level (m) 

7 . .... ... ... ............................ ... ., ......... .... ... ...... ...... ... .......... ................................ ..... . .. ... .. . . . ... . .. .. .... .. . .. .. ..... .. .. .. .. .. ... .. .. .. .. . .. .. .. .. .. . .. .. .. .. . 

)*-X CNTRLVAR233 

6.,. . 

.' ..

1 16 18 2 

Time ds) dp - p dp

2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10

28 "103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.45: CL Loop-Seal 20 SG-Side RELAP(X), Experiment(+)

z

"0. 

5.

M CD 

_0 

0 

z 

0 

C: 

z 

0 

Co 

C0 

Z 

-. 

--I 9,

Depress. dp 

N Injection 1. h. leg 10
Dieses Blatt unterliegt den Weitergabebeschr~nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:19:1

DOKU.98051 3.1842.14668 t

Collapsed Level (m) (m) 

6 .5 .................. ................. 

6.0 ........ 

5 .5 ........................... ................... . 

5 .0 .. .....................

4.5 ........ ............... r ........... .. ........ tl ................. ...............

)E-X CNTRLVAR333 

...... ...... ...... ........................... .................. ................................ 

S.. ......................... ........ - l li ~i l ... J ..... i ii l ................ ................ I.. " .I• ........... ...... ....... 

.. ..... . ........

JI11Iii!p

4.0

3.5

3.0-

2 4 6 8 10 12 14n 

Time:js) 

1dp 

eg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40

1 i6 1 i8 2 

dp 

5. h. leg 10

26 i 28 .10 3

dp 

6. c. leq 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.46: CL Loop-Seal 30 SG-Side RELAP(X), Experiment(+)

:3 

CD 

0 

CL

:IJ 

CD 

0 

z 

09 

z 

0 

(0 

m 

0 

P.--

2.5

Depress. dp 

N Injection 1. h. I

"-o 

-.4 

0)

-4 ........................... ......... .................. ............................ ................ 

. ....... .. .. ........... ......... 

... .. .. ... ..... .. ... ... .. .. .. .. .. .. .. .. ... .. .. .. ... .. .. .. ..

S............. ........................... .... 

.. ........... 

.. .. .. .. .

................... 

..............I 

I ...................
Dieses Blatt unterliegt den Weitergabebeschrtnkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 25.5.98 7:19:2 

-r+ 

SD) CD 

DOKU.980513.1842.14668 Q 0 

Collapsed Level (m) (m) "" 

X ---+ CNTRLAR43 0 

65 ............. ........ .... . ........... . .. . ....... ... .. .. . .. .. .......... . . . . . . . . . . .z: 

6.0 ,Z 

5 .5.÷ • ........ ...... ......... 0 

m 

iIII:,, 

5 .0 ; t,,,, ,,....... ............................ , ........................ . .............. ........................... ........................... ........................... ........................... + ... ............. - ..+.......,. , , +,,. .+. •m................. t ............................ 

+~ .... ...... . ...... ............... ................. 

3.5 + I. ; 

4 .5"" "' + .......... ..................... . 

.......... +++. 

3.0 - -i 9 ) 3 .5 - .. ...... ... .. ................ .... ................................ ............................ .............. ................. ........................... ............................ ........................... ............................ ............................ -........................ ............................ 

3 .0 . . .... ................................. ............................ ........................ . ................ ............. .............. .. ... ........................... ............................ ........................... ................ ........................... ........................... ......................................... .... 

"-.4 

2.5 

0 2 4 6 8 10 12 14j 16 18 2ý 22 24 26 28 *103 

Depess dpTime _ s) - Depress. dp _ dp dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.47: CL Loop-Seal 40 SG-Side RELAP(X), Experiment(+)
Dieses Blatt unterliegt den Weitergabebeschr.nkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 25.5.98 7:27:34

DOKU .980513.1842.14668

Collapsed Level (m) 7 .5 -1 .. ....... .................

z) 

z

7.0 

6.5 

6.0 

5.5 

5.0 

4.5 

4.0 

3.5

3. h. 1ea120 4. c. lea 40

I i' ' I i ' I, ' 

16 18 

dp

5. h. lea 10

*103

dp 

6. c. lea 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.48: RPV RELAP Core(X), DC(+); Experiment Core(Z), DC(Y)

S.................. ..............,. ........................... .. ....................... ........ .. ............... ............................. .... ......... i ...................... ; , • ............. ... ................ ....• ; ............... .. .... 

![ ........................ .................... .... ....... ............. ......................... . ............................. ....................... ....................... .... ............................. ..................... ............... .............. ...... 

1'z

i 'Z A... 

AAU, .w i liy!~ iii 

.......... . . . .............................. .... ...... ...................... . .. . .. . .. .... . . .. . .. . . .. ... . .. . -.... .. . .. . .... ... . .. . .... . .. . .. . .. .. ... i I, 

1 J ., I _ ,.n : • .,.. .t il i l

(0 

CD 

CL)

CD 

0 

0 

z 

(J) 

QO 

m

I " i ' I " I" I i 

10 12 14s 

Times

Depress. dp 

N Iniection

0

1. h. lea 10 2. c. lea 30

Co 

CDo
Dieses Blatt unterliegt den Weitergabebeschrýinkungen This document is subject to the restrictions 

wie auf Titelseite bzw. erster Seite angegeben set forth on the first or title page 26.5.98 6:23:30 

DOKU.980513.1842.14668 a. 0 

z5" ,z tLiquid Generation (kg/s) U 

0 .0 2 0 . .............................. ................. ................................................. . ......................... .......... ......... ..............................................

....... 

0.015CD 

Co 

m CL 

............ ................ ........... . 

0 .0 0 5 ,- . ..................... .. . .................... .... ............................. .... ................ ,............................ ........................... .......................... ........................... .! ........................................................ ............. 

' i 

0.000 . ... 4. ... - -- -i-- + - ---- -

RELAP Calculation CrD 

0 2 4 6 8 10 12 16 18 2- 22 24 26 28 *103 

Depress. dp Time~s) dp dp 

N Injection 1. h. leg 10 2. c. leg 30 3. h. leg 20 4. c. leg 40 5. h. leg 10 6. c. leg 30 

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.49: Condensate SG 10, Pipe 320 Ascending(X), Descending(+) U-Tube
Dieses Blatt unterliegt den Weitergabebeschrtnkungen 

wie auf Titelseite bzw. erster Seite angegeben

This document is subject to the restrictions 

set forth on the first or title page 26.5.98 6:23:46

DOKU.98051 3.1842.14668

Liquid Generation (kg/s) 0 .

0 5 - ...............................

0.04 

0.03 

0.02 

0.01 

0.00 

-0.01 

Depress. dp

N Injection 1. h. leg 10

' " I ' ' I ' " I " " I " " I ' 

6 8 10 12 1T 4 

Tim c4eg 

2. c. leg 30 3. h. leg 20 4. c. leg 40

6 118 1 2d1 

dp

5. h. leg 10

*103

dp 

6. c. leg 30

Comparison of Experiment und Analysis PKL III B 4.3 

Data b4_3 -- RELAP5/Mod3.2 

Fig. 4.50: Condensate SG 20, Pipe 420 Ascending(X), Descending(+) U-Tube

C) 

z :3 

CD 

0, 

CD CL

CD 

-o 

0 

z 

0 

C 

z 

0 

(Co 

m 

0

co 

CD 

02

J
NRC FORM 335 U.S. NUCLEAR REGULATORY COMMISSION 1. REPORT NUMBER 

(2489) (Assigned by NRC, Add Vol., Supp., Rev., NRCM 110GD and Addendum Numbers, If any.) 3201,3202 BIBLIOGRAPHIC DATA SHEET 

(See inshocb= on the revee) 

2. TITLE AND SUBTITLE NUREG/iA-0170 

RELAP5/MOD3.2 Post Test Calculation of the PKL-Experiment 3. DATE REPORT PUBLISHED PKLIII-B4.3 3.__DATEREPORT__PUBLISHED MONTH j YEAR 

November 1999 

4. FIN OR GRANT NUMBER 

5. AUTHOR(S) 6. TYPE OF REPORT 

L. Karner Technical 

7. PERIOD COVERED (Inclusive Daebs) 

8. PERFORMING ORGANIZATION - NAME AND ADDRESS (ff NRC, provide Division, Office orRegion, U.S. Nuclear Regulatory Commission, and malting addrss; if contractor, 

provide name and mailing address.) 

Siemens Energierzeugung (KWU) 

Freyerslebenstrasse 1 

D-91058 Erlangen 

Germany

9. SPONSORING ORGANIZATION - NAME AND ADDRESS If NRC, type "Sene as above'; ifconhw.acor, provide NRC Division, O•ft& or Region, U.S. NuckeerRegu/afor, Commission, 

and mailing address) 

Division of System Analysis and Regulatory Effectiveness 

Office of Nuclear Regulatory Research 

U.S. Nuclear Regulatory Commission 

Washington, DC 20555-0001

10. SUPPLEMENTARY NOTES

11. ABSTRACT (20o words or-ess) 

The PKL III test facility (Primar-Kreis-Lauf) simulates a typical 1300 MWe Pressurized Water Reactor of Siemens/KWU. In test 

B4.3, the influence of non-condensables on heat transfer in the steam generators during reflux condenser conditions was 

investigated. This report presents the results of a post-test analysis of PKL 11I-B4.3 using RELAPS/MOD 3.2. A description of the 

input model is given, and the correspondence of measured and calculated results is discussed.. The results of the calculation 

show differences in the distribution of nitrogen in the primary system compared to the experiment When nitrogen was injected into 

the hot leg of the primary system, the heat transfer in the affected steam generator decreased. In contrast to the experiment 

RELAP calculated that the volumes in the adjacent steam generator did not get the full amount of nitrogen and that nitrogen was 

transported from the steam generators to other locations during the course of the transient Thus, the heat transfer in these steam 

generators later increased in contradiction to the measured values. In the steam generator tubes, RELAP calculated that the 

nitrogen accumulated in the descending part as predicted in the experiment For the ascending U-tubes RELAP predicted that the 

nitrogen was transported to the loop seal, which was not seen in the experiment Fluctuations occurred during the course of the 

RELAPS/MOD 3.2 analysis of the PKLIII 134.3 experiment This phenomenon may be the main reason, that RELAP calculates the 

transport of nitrogen from the steam generators into the system and predicts finally a homogeneous distribution of nitrogen in the 

primary system. The analysis performs an in kind contribution to the CAMP contract

12. KEY WORDS/DESCRIPTORS (Ust words orphrases that will assistresearchers in locating Yeraport 13. AVAILABILITY STATEMENT 

PKL III Test Facility unlimited 

PWR 14. SECURITY CLASSIFICATION 

non-condensables (This Rge) 

steam-generator unclassified 

RELAP5/MOD3.2 (This Repor) 

unclassified 

15. NUMBER OF PAGES 

16. PRICE

NRC FORM 335 (2-89)
Federal Recycling Program
NUREG/IA-O0170 Rl fI,AIS/M(-j)3.2 V'OS'TTfEI ' (AL4jUJLA-I ION (OF I HiP _KL-FXPL{IM!f• KII-fi', -

UNITED STATES 

NUCLEAR REGULATORY COMMISSION 

WASHINGTON, DC 20555-0001

SPECIAL STANDARD MAIL 

POSTAGE AND FEES PAID 

USNRC 

PERMIT NO. G-67

OFFICIAL BUSINESS 

PENALTY FOR PRIVATE USE, $300

" k, k- -" fvl K -1H K -i ýf ý; lp