0FY2014 Technology Research Association International
Decommissioning R&D Institution Symposium

Current Status
on Fukushima Daiichi NPS
July 18, 2014
Naohiro MASUDA
Chief Decommissioning Officer,
Fukushima Daiichi Decontamination andDecommissioning Engineering Company
Tokyo Electric Power Company
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Current Status on Fukushima Daiichi NPS(Status of Reactors and Buildings)
 All units maintain cold shutdown state
SFP

Bldg. cover

Opening was closed

Reactor Bldg.

構台
RubblesremovedRemoved fuel Assemblies

ｸﾛｰﾗｸﾚｰﾝ1188/1533

福島第一
安全第一
福島第一
福島第一
安全第一
安全
第一

（As of June 90)

PCV
Injection

Injection

RPV

Injection

Fuel debris
福島第一
安全第一
安
全第一

Vent pipes
Torus room
S/C

Unit 2

Unit 1℃
100

Feed water temperature :Temperature :
80
90
70

100 ℃

Unit 1

90

Unit 2

80

Unit 3

70

60

60

50

50

40

40

30

30

20

20

10

10

0

Unit 4 As of June 27, 2014

Unit 3

Feed water temperature :Temperature :Unit 1
Unit 2
Unit 3

0

3/21

3/31

4/10

4/20

4/30

5/10

5/20

5/30

6/9

6/19

6/29

Temperatures of RPV bottom (for three months)
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

3/21

3/31

4/10

4/20

4/30

5/10

5/20

5/30

6/9

6/19

6/29

Temperatures inside PCV (for three months)

Current Status on Fukushima Daiichi NPS

2(Status of airborne radioactive materials)
 The amount of radioactive materials (cesium) released from Unit 1-3 PCVs is assessed based onairborne radioactive material concentrations (dust concentration) at the top of Reactor Buildings→Calculated the assessed value of total release amount (as of July, 2013) as about
10 million Bq/hr.
→About one-80 millionth compared to immediately after the accident.
 Accordingly, assessed the exposure dose at site boundary as 0.03 mSv/yr. at maximum.
(Excluding effect of already released radioactive materials)

1510

Note: Exposure limit established by law is 1 mSv/yr.

The release amount per hour of the radioactive materials (cesium) from Units 1 to 3

Release Rate (Bq/hr)

Approximately one-80 millionth
compared to at the time of accident

13

10

11

10

about 10 million Bq/hour(about 1×107 Bq/hour)

910

3/15 3/25 4/4 6/20 7/26 9/1
10/3 11/1 11/26 12/28 2/1 2/24
- 3/26 - 4/6 - 6/28 - 8/12 - 9/17 - 10/13 - 11/10 - 12/6 - 1/13 - 2/13 - 3/7
2011

2012

3/27
- 4/15

May

July Sept.

Nov.

Jan.
2013

Radioactive particle (Cesium) release per hour from Units 1 to 3
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Mar.

May

July

3

Current Status on Fukushima Daiichi NPS (Status of monitoring port area)
Concentration of radioactive materials has been reduced up to one-100,000th to one-1,000,000th ascompared to the time right after the accident.
（ Bq/L）
物揚場前
機放
水口北
側 5 and 6
North side5,6号
of wateroutlets
at Units（Bq /L ）1 00 000 00

I-1 31
Cs-1 34
Cs-1 37

10 000 00

10000000

Front～ofcargo unloading wharf
シ ル トフ ェン ス 設 置：4/11
4/14

1000000

Installation of silt fence: April 11 to April 14

I-131
Cs-134
Cs-137

1000001 000 00

10000
100 00

1000
10 00

100
1 00

10
10

・Cesium 137: 90 Bq/L
・Cesium 134: 60 Bq/L

（Bq/L）
10000000

南放水口付
Vicinity ofsouth side of近water outlet

14/7/2

14/5/3

14/3/4

14/1/3

13/11/4

13/9/5

13/7/7

13/5/8

13/3/913/1/8

12/11/9

12/9/10

12/7/12

12/5/13

12/3/14

12/1/14

11/11/15

11/9/16

11/7/18

14/7/2

14/5/3

14/3/4

14/1/3

13/11/4

13/9/5

13/7/7

13/5/8

13/3/913/1/8

12/11/9

12/9/10

12/7/12

12/5/13

12/3/14

12/1/14

11/11/15

I-131
Cs-134
Cs-137

1000000
100000
10000
1000
100
10

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

14/7/2

14/5/3

14/3/4

14/1/3

13/11/4

13/9/5

13/7/7

13/5/8

13/3/913/1/8

12/11/9

12/9/10

12/7/12

12/5/13

12/3/14

12/1/14

11/11/15

11/9/16

11/7/18

11/5/191
11/3/20

11/7/18

11/5/19

11/3/20

11/9/16<Reference> Notified concentrations(Concentration limits for water outsideenvironmental monitoring area)

11/5/19

11/3/201
1

Current Status on Fukushima Daiichi NPS (Plant stabilization)4

 Hydrogen concentration has been kept below inflammability limit by nitrogen injection
into PCV and RPV to prevent hydrogen explosion.
 Gas is extracted from PCV and filtered, radioactive materials released into
environment are reduced.
 Concentration and amount of radioactive materials released into atmosphere aremonitored.
 Subcritical state is also monitored by monitoring radioactive concentration of shortlifetime nuclides (Xe-133, Xe-135).

ReleasePrimary containment vessel (PCV)
gas control system
HEPA
Air extraction fan
filterNitrogen Supply
Unit

Monitor of inert gas
and hydrogen

Nitrogen injection and gas control system (Unit 1)
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Current Status on Fukushima Daiichi NPS (Cooling of SFPs)

5

 To continuously remove decay heat generated from fuel in
SFP, water in SFP is cooled by using both existing facilities
and newly installed facilities.
 Chlorine concentration was decreased by mobile reverse
osmosis (RO) no later than March 18, 2013. It is regularly
monitored to be less than 100 ppm.
R/B
SFP circulate water cooling system in Unit 4

Skimmer surge tank

RW/B
Emergency water
injection line

SFP

FSTR/B*

OutsideCirculated watercooling system

Spent fuelHx unitCooling tower：Existing line
：Temporary line of primary system：Temporary line of secondary system：Connected line injected from outside*Cooling tower supply water, water
injection of skimmer surge tank,emergency water injection, etc.

PrimarysystemPrimary pump
Water supply line forskimmer surge tankＨｘ

FPC HxSecondarysystemサージ
タンク

Secondarypump

Water supply line forcooling tower

SFP alternate circulate water cooling system (Unit2)
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

* Filter sludge
tank roombuilding

Current Status on Fukushima Daiichi NPS (Reactor cooling)6 Plants
Plants have
have been
been stabilizedstabilized with
with sufficiently
sufficiently low
low temperaturetemperature byby continuous
continuous circulation
circulation water
water cooling.
cooling.
 Plant
Plant conditions
conditions have
have been
been monitored
monitored at
at seismic
seismic isolated
isolated buildingbuilding on
on aa 24-hour
24-hour basis.
basis.
Primary
containment vessel

100000000

Reactor pressure
vesselInflow ofground water~400m3/day

Turbinebuilding

Cs-134
Cs-137
全β betaGross
H-3

1000000
100000
10000
1000
100
10

100000000

1
0.1

建屋滞留水
Accumul

ated1
water
insidebuilding

CesiumremovalRadioactive concentration

Spent fuel pool

10000000
放射能濃度［Bq/㍑］[Bq/liter]

10000000

Radioactive
concentration
放射能濃度［Bq/㍑］[Bq/liter]

Reactor building

1000000
100000
10000
1000
100
10
1
0.1

Contaminated water

Groundwater
Reactor cooling water
Approx. 320m3/day

Cooling by recirculating cooling water

Coolingwater
Reactor water injection pump tank
Cooling
watertank

100000000

種の放射能濃度Approx. 720
m3/dayDesalination
・ Reserve
osmosismembrane・ Evaporative
concentration

Temporary storage
facility
Waste sludge
Waste absorbent, etc.

Treated water(contaminated water)

Approx. 400 m3/day
Radioactive concentration[Bq/liter]

Radioactive
concentration
放射能濃度［Bq/㍑］[Bq/liter]

10000000

Fresh
water

Back-up equipment

セシウム除去建Outlet water2
装置出口水of cesium
removal unit

1000000
100000
10000
1000
100
10
1
0.1

Outletwater of
淡水化処理装置
desalination
3 unit
出口水（淡水）(Freshwater)

Storage tanks

Advanced Liquid
Processing System (ALPS)All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Storage tanks

Outlet water of
ALPSCurrent Status of Fukushima Daiichi NPS (Contaminated water storage)

7

Status on contaminated water storage TonalTonal amountamount ofof 490,000m
490,000m33 ** isis stored
stored inin tanks.
tanks.
 Current
Current available
available storage
storage capacity
capacity** isis 520,000m
520,000m33..
 Available
Available storage
storage capacity
capacity will
will bebe increased
increased up
up toto 800,000m
800,000m33.. (by(by thethe endend ofof March
March 2015
2015 ))

Steel square type tankFlange type steel
cylindrical tank

Welded type steel
cylindrical tank

【Amount of contaminated water stored in tanks＊】
Fresh water：
approx. 24,000m3
Waste water generated by evaporative concentration：
approx. 9,000m3
Concentrated salt water at RO device：approx. 366,000m3
Water treated by ALPS：
approx. 92,000m3【 Available amount of storage tank＊】
Steel square type tank：approx. 3,000m3(Accumulated water in Units 5 and 6, concentrated salt water at RO
device)Flange type steel cylindrical tank：approx. 291,000m3(Fresh water, concentrated salt water at RO device, water treated by
ALPS)

Welded type steel cylindrical tank：approx. 174,000m3(Concentrated salt water at RO device, water treated by ALPS)

Steel horizontal tank：approx.
Steel horizontal tank

38,000m3(Concentrated salt water, waste water generated by evaporative
concentration)

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

*As of June 17, 2014

Measures against contaminated water
Sub-drain
Groundwater bypass

Ocean-side
Impermeable
walls

Ground improvement<< Overview
Overview on
on groundwater
groundwater flow
flow aroundaround buildings
buildings at
at Units
Units 11 to
to 4>
4>
33

/day ofof groundwater
groundwater flows
flows into
into thethe sitesite fromfrom thethe mountain
mountain Approx.
Approx. 800
800 m
m /dayside.
side. ItIt is
is assumed
assumed thatthat approx.
approx. 400
400 m
m33/day/day out
out ofof 800m
800m33/day/day flows
flows into
into
33
the
the buildings
buildings andand thethe remaining
remaining (approx.
(approx. 400
400 m
m /day)/day) flows
flows into
into thethe sea.
sea.

 As
As thethe groundwater
groundwater flowing
flowing into
into thethe buildings
buildings becomes
becomes contaminated,
contaminated, itit
needs
needs processing.
processing.
Three basic principles of measures against
contaminated water
1. Removal of contamination source ●2. Isolation of water from contamination source ○3. Leakage Prevention of contaminated water ◆Land-sidefrozen-soil
impermeable
walls

Drainagechannel8Emergency measures

Fundamental measures

1. Removal of highly
contaminated water fromtrenches ●2. Ground improvement at
contaminated area with waterglass, pavement of groundsurface with asphalt, etc. andpumping up groundwater ○◆3. Pumping up groundwaterfrom the mountain side
(Groundwater bypass) ○4. Pumping up groundwaterby sub-drain ○5. Installation of ocean-side
impermeable walls ◆6. Installation of land-side
frozen-soil impermeable walls○
7. Installation of contaminatedwater processing facilities
with higher performance ●
etc.

＋

＋

Main preventive measures(1)

Additional measures taken against inflow of groundwater (consideration of facing) ○, etc.
Provided by Japan Space Imaging Corporation, (C)Digital GlobeAll Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Measures against contaminated water – Emergency measures – 9
Groundwater pump up(Groundwater bypass)

Emergency measure (1)Eliminate highly
contaminated water intrenches. [Removal]

Pump-up
Water level
Reactor
Building

TurbineBuilding

Pump-up

TrenchPermeable

Laye
Low perm
eable La ryer

Permeable Layer
Low Per
Pump-up wellmeableLayer

Sub drain

Sub drain

Isolation of water from thecontamination source

Emergency measure (3)Pump up groundwaterfrom the mountain side
(groundwater bypass)[Isolation]

Sea level

Groundwaterdrain pump-up

Emergency measure(2) Improve ground at thecontaminated area with water glass, pave theground surface with asphalt and pump up
groundwater. [Isolation], [Leakage prevention]
 Improve
Improve groundground andand pump
pump up
up groundwater
groundwater PavePave groundground surface
surface with
with asphalt
asphalt toto curb
curb rainwater
rainwater
infiltration
infiltration• April 9,2014, pumping up
ground water at the wells
was started.
Pump-up well

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Measures against contaminated water – Fundamental measures –10

Fundamental Measure(4) Pump up
groundwater by sub-drains. [Isolation]
Water level
Pump-up

Reactor
Building

TurbineBuilding

Pump-up

Permeable

Sea level

Layer
Low perm
eable Layer

Permeable Laye
Pump-up wellr
Low PermeableLayer

Sub drain

Sub drain

Isolating water from thecontamination source

Fundamental Measure (6) Install the land-side
frozen-soil impermeable walls on the mountain side
to curb increase contaminated water generated bygroundwater flowing into buildings. [Isolation]
Freezing
Freezing began
began in
in March,
March, 2015.
2015. [Supported[Supported byby METI]
METI]All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Groundwater drain
pump-up

Fundamental Measure (5) Install the ocean-side
impermeable walls. [Leakage prevention]

11

Measures against contaminated water<Discharged water date/amount>
Unit: ton
Discharged
amountMay, 21

Facility overview
Already
blocked561 ton

Pit C

Pit B
Pit B

Unit-2seawaterpiping trench

3Jun, 2833 ton

4Jun, 81,563 ton

Tunnel B
Unit-3seawaterpipingtrenchJun, 14

1,443 ton

6

Jun, 20

1,765 ton

7

Jun, 26

1,829 ton

8

Jul, 2

1,858 ton

9

Jul, 8

1,725ton

Groundwater will be pumped up from the mountain side and discharged into
the ocean (Groundwater bypass). It is expected that the amount of inflow
into the buildings is to be reduced by tens to 100 tons of water at maximum.
The water pumped up from pump-up wells is temporarily stored in tanks tomeasure the radioactivity. It is ensured that the values are less than thetarget values prior to discharge.

Shortening of
circulating coolingwater line
Approx. 3 km

Unit 1 to 3 CSTApprox. 0.8 km

Unit-3 turbine
building

Excavated duct

Ground-freezing water-shutoff location
Location to be used freezing plant, etc.
Internal block location




SARRY

Shorteningof linePit D
Example of freezing model test condition



SPT

TunnelPit A

Unit-2 turbine
building

New RO

Cable
tray

Piping

Pit D
Pit A

5

nel C
Tun

Tunnel B

lA
Tunne

641 tonlC
nne
Tu

May, 27

Tunnel A

2

Pit C

Pit

Date
1

Removal of highly contaminated water from trench

Turbine building3

Groundwater bypass

PackerRight after the accident, contaminated water flew out to the ocean fromthe seawater inlet through trenches, etc.
Outflow locations were sealed. However, the contaminated water
stayed in the underground structures should be extracted, and thestructure should be blocked.
Treatment of the water stayed in trench has been conducted withmobile processing units (Commencing on Nov. 14, 2013 at Unit 2; on
Nov. 15, 2013 at Unit 3)
Freezing and water removal are prepared/underway. (Unit 2: Starting
freezing on Apr. 2, 2014. It was expected that freezing would becompleted in June 2014, but freezing is not going on as planned.
Freezing is still continuing. Unit 3: Planned to complete freezing in Aug.
2014)

By installing a new RO system inside the Unit 4 turbine building, the length ofthe circulating cooling water line for the reactor will be shortened to approx.
0.8 km from current 3 km by the end of March, 2015 in order to reduce the riskof leakage and avoid radiation dose of workers.

Storage tanks(RO treated/condensed water)

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Measures against contaminated water

12(Improvement on processing efficiency of ALPS)● For more efficient contaminated water processing(ALPS with high-performance by government support) Current
Current ALPS
ALPS has
has three
three trains.
trains. These
These trains
trains areare currently
currently inin operation.
operation.
 Additional
Additional ALPS
ALPS will
will also
also have
have three
three trains.
trains. Operation
Operation commencement
commencement isis plannedplanned inin thethe middle
middle ofof FY2014.
FY2014.
 High-performance
High-performance ALPS
ALPS will
will have
have one
one system.
system. Operation
Operation commencement
commencement isis also
also plannedplanned inin thethe middle
middle ofof FY2014.
FY2014.

Current ALPS

Additional ALPS

High-performance ALPS*

Processed amount

750 m3/day

750 m3/day

500 m3/day or more

Number of trains

3 trains(250 m3/train)

3 trains(250 m3/train)

1 train

Target nuclides toremoveConcentration limit by law or less for 62 out of all 63 nuclides(except for tritium).

Waste generation
amount－－

1/20th compared withexisting ALPS

Operationcommencement

March 2014

Middle of FY 2014

Middle of FY 2014

* Conducted as a project with expense support form Government of Japan.
* Implemented to greatly reduce the amount of secondary waste generated as deposit after water processing(80% or more) and to improve the processing performance.
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Measures against contaminated water

13(Status on response to ALPS trouble)■ Configuration of existing ALPS
Deposition
processing
products

To HICfor slurry

Batch
processing
tank 1

To HICfor slurry

Boosterpump 2P
Circulation
pump 1

Supplypump 2

Supernatant

PP
Decantpump

Decanttank

Supplypump 1

Processing
columnCoprecipitationtankP
To the tanks/
reservoirs

Circulation
pump 2

Adsorption
tower

Adsorption
tower einlet
Buffer tankP
OutletFilterP

1) Pre-processing facilities(Iron coprecipitation
processing)

Chemical
supplyfacilities(shared)(Carbonate deposition
processing)

Ca concentration at outlet of booster pump 1
Sampling
date
3/27
5/17
5/20

Transport Transpor
t
tank
pump

Boosterpump 1 Spent2) Pre-processing facilities Adsorbent
To HIC for
adsorbents

Sampling(radioactive concentration)

Additional sampling (Ca concentration)
Sampling
train
train-Atrain-Atrain-C

3) ALPS

Cross-flow
filter 2

P

Slurrytransportpump

To HIC for
adsorbents

P

Supply
tank

P

Batch
processing
tank 2Filters whose parts have undergone radiation degradationand leakage

Cross-flow
Filter 1

Circulation
tank

SlurryDeposition
processing
products

Ca
concentration
11 pm
11 ppm6.2 ppm

Water radioactive concentration at train outlet (Gross beta level)
Sampling location
train B outlet watertrain-A outlet watertrain-C outlet water

Sampling
date
3/18
5/17
5/19

Radioactive concentration(Gross beta level)
103 to 104 Bq/cc
2.4×10-1 Bq/cc
4.0×10-1 Bq/cc

 In train-B, filter components have degraded due to radiation, causing contamination to moving downstream. The parts were replaced withthose higher resistant against radiation, and operation of train B restarted on May 23.
 In trains A and C, measures are taken to allow earlier detection on contaminant (additional sampling) to prevent them from moving
downstream.
 Operation of train A was also restarted on June 9 after the filter were replaced with another one. Operation of train C was restarted on June
22 after taking same measures.
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Major work steps for decommissioning and current status of respective Unit

14


 The
The major
major work
work items
items forfor decommissioning
decommissioning include
include fuelfuel removal
removal fromfrom SFP,
SFP, fuelfuel debris
debrisremovalremoval (molten(molten fuel),fuel), dismantling
dismantling plant
plant etc.
etc.

 Currently
Currently removing
removing fuels
fuels fromfrom Unit
Unit 44 SFP
SFP andand simultaneously
simultaneously preparing
preparing forfor starting
starting
fuel
fuel debris
debris removal
removal inin Units
Units 11 to
to 3.
3.

Units 1 to 2
Fuel removal from
SFP

Unit 3

Rubbleremoval,clean-up

Unit 4
Installation offuel removal
facility

Fuel removal

Storage/Trans
port

Units 1 to 3
Fuel debris removal(molten fuel)Clean-up,
Investigationof leaklocation

Water sealing,filling water

Dismantling plant etc.

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Fuel debris
removalDeveloping
scenario andtechnology

Storage/Trans
port

Designing andmanufacturing
equipment

Dismantlingetc.

Current Status of Unit 1
Current Status•Building cover installed (November, 2011)•Sustained stable reactor cooling, which has reduced the generated amount of radioactive
materials

Tasks•Removal of the building cover•Identification of the status of debris on the defueling floor and inside the pools•Countermeasures for the dispersion of radioactive materials during the removal of thebuilding cover•Shortening the period of the time of removing the building cover

As of Mar. 12, 2011
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Completion of building cover structure
Present

15

Toward fuel debris removal (Preparation for fuel debris removal)

16

Investigation under vent pipes in Unit 1 (Overview) To
To repair
repair (seal(seal thethe waterwater leak
leak locations
locations of)of) thethe PCVPCV inin preparation
preparation forfor thethe fuelfuel debris
debris removal,
removal, investigation
investigation under
under
vent
vent pipes
pipes waswas conductedconducted to
to identify
identify thethe leakleak locations
locations inin thethe PCV.
PCV.
 WithWith thethe images
images taken
taken byby thethe camera
camera equipped
equipped with
with thethe waterwater boat,boat, itit waswas checked
checked whether
whether there
there isis anyany waterwater flow
flow
from
from thethe sleeve
sleeve ends
ends ofof vent
vent pipes
pipes oror not,not, andand thethe status
status ofof thethe sandsand cushion
cushion drain
drain pipes
pipes waswas also
also checked
checked (by(byviewingviewing appearance).
appearance).
PCV

Vacuum break line

SR
valv
e ex
Ven
ha u
t pi pst p
s l ee
e
ipe
ve

A
Sand
cushion

Sand cushiondrain pipe

S/C
Vent pipe

B
C
D

Location Ａ: Vent pipe sleeve
Location B: Vent pipe
Location C: Sand cushion drain
pipe
Location D: Sand cushion ringheader

サンドクッション
ドレンライン
Drain funnel

Water boat
Water boat: trial operation at the plant
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Suppression chamber (S/C)

17

Finding of leakage at the Unit 1 By
By deploying
deploying aa remoteremote controlledcontrolled robot
robot onon thethe catcat walks
walks inin thethe torus
torus room
room inin thethe Unit
Unit 11fromfrom MayMay 27,27, aa leak
leak fromfrom thethe protective
protective cover
cover ofof aa expansion
expansion joint
joint onon vacuum
vacuum break
break
line
line was
was identified.
identified.
 The
The investigation
investigation results
results will
will bebe reflectedreflected into
into thethe planningplanning forfor further
further investigation
investigation andandsealingsealing thethe waterwater leak
leak location
location ofof thethe PCVPCV forfor filling
filling thethe PCVPCV withwith water
water inin thethe future.
future.
SHC system

CameraACc

Torus hatch Va

m
uu

b

n
k li
a
e
r

e
V
PC

e
sid

Protective cover for
expansion joint
Leakexpansion
joint
Vacuumbreak valve

Vacuum break valve

Cat walks

Robot “Hitachi Tele Runner”

Image of investigation on upper part of suppression chamber
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Current Status of Unit 2
Current Status•Very high radiation level in the building
Inspection of contamination status on the defueling floor will be conducted in the future.

Tasks•Radiation dose reduction measures•Countermeasures for the dispersion of radioactive materials during engineering work
Opened blowout panel

As of Apr. 10, 2011
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Present

18

Toward fuel debris removal (Preparation for fuel debris removal)

19

Measurement of water level in S/C in Unit 2 (Overview) To
To repair
repair (seal(seal thethe waterwater leak
leak locations
locations of)of) thethe PCVPCV inin preparation
preparation forfor thethe fuelfuel debris
debris removal,
removal, thethe waterwater level
level inin thethe
S/C
S/C waswas measured
measured toto assume
assume thethe statestate ofof thethe opening
opening area
area at
at leakleak locations
locations inin thethe PCV.
PCV.
(By(By checking
checking thethe waterwater level
level difference
difference between
between thethe inside
inside andand outside
outside ofof thethe S/C,
S/C, thethe opening
opening area
area waswas assumed,
assumed,andand itit will
will bebe considered
considered thatthat itit isis possible
possible whether
whether thethe waterwater sealing
sealing materialmaterial might
might flow
flow out
out ofof thethe S/CS/C oror not.)not.)
Water levelmeasurement device

Ascending/descending unit

Winch unit

Transfer unit

Status of installation of device on
S/C outer surface

Appearance of measurement
device-hanging/retrieving device

Outer surface on S/CTorus room

トーラス室

S/C
Ｓ／Ｃ

Device-hanging/retrieving device
装置吊り
下ろし・回
収装置

Water levelmeasurement device

Water level
Ｓ／Ｃ内
difference
水位測定
between theinsideand outside
装置of S/C:

Water levelmeasurement
deviceMovingApprox. 30 cm

Accumulated water surface
in torus room

Overview on water level measurement in S/C at Unit 2
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Measurement by device

Toward fuel debris removal (Preparation for fuel debris removal)

20

PCV (inside of pedestal) investigation in Unit 2 (Provisional plan) Investigation
Investigation isis plannedplanned by
by putting
putting thethe investigation
investigation device
device into
into pedestal
pedestal via
via X-6
X-6
penetration,
penetration, CRD
CRD exchanging
exchanging rail
rail andand opening
opening ofof pedestal
pedestal soso thatthat location
location (distribution)(distribution)ofof fuelfuel debris
debris inin pedestal
pedestal can
can bebe identified.
identified.
 Status
Status waswas checked
checked fromfrom CRD
CRD exchanging
exchanging rail
rail toto opening
opening ofof pedestal
pedestal as
as preliminary
preliminary
investigation.
investigation.
Investigation

ＰＣＶ
Both for identifying the access route inside the pedestal
and for understanding the status and circumstantialcondition inside the PCVInvestigation on the status of
CRD exchanging rail andopening of pedestal

RPV

CRD

Investigation conducted from X53 penetration in August, 2013

Platform
X-6
Penetration

CRD exchanging rail
Opening ofpedestal

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Personnel airlockToward fuel debris removal (Preparation for fuel debris removal)

21

PCV (inside of pedestal) investigation In Unit 2 (Investigation results)②①
1F Grating
1F GratingEdgeexch of CRD
angi
ng r
ail

n toward l
Directioaf pedest
o
g
in
n
e
op

CRD
exchanging
rail face

Image location and direction

CRD
exchanging
rail facef raoe
Edg ht of
g
hei m
30m

il

Deposit

RPV

X-53

③

PCV
Opening of pedestal

X-6

①
②
③

Pedestal

1F Grating
CRD exchanging rail
Perimeter of opening of pedestal

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

22

Finding of water levels inside unit 2 Pressure Containment Vessel After
After failing
failing toto insert
insert aa measurement
measurement instrument
instrument in
in March
March 2012,2012, re-inserting
re-inserting ofof anan
instrument
instrument was
was successful
successful inin early
early June
June 2014.
2014.
 Water
Water levels
levels andand temperaturestemperatures inside
inside PCV
PCV have
have since
since been
been monitored.
monitored.

［As of 8:00, June 11, 2014］：Thermometer：Water gauge

Monitoring results
Height

TE08

X-53

X-53
OP12,460

Temp.[℃]

The water level seems to bearound over flow height into
the vent pipe

TE07

V
PC

Grating OP 9,510

ell
sh

pe
t pi
ven

TE06

Water depth :300 mm

TE05
TE04
TE03
TE02
TE01

LE05
LE04
LE03
LE02
LE01

344 mm(design value)

Water level

TE08

33.7

－

－

OP.11,920

TE07

33.7

－

－

OP.10,690

TE06

33.5

－

－

OP.8,100

TE05

33.5

LE05

OFF

OP.6,430

TE04

33.5

LE04

OFF

OP.6,230

TE03

33.6

LE03

OFF

OP.6,030

TE02

35.0

LE02

OFF

*350 mm from the bottom of
PCV

TE01

35.8

LE01

ON

* 350 mm from the bottomof PCV

OP.5,830
Bottom of PCV

Ref: around a vent pipe

Bottom of PCV OP 5,480

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OP.5,630

Current Status of Unit 3

23

Current Status•Debris removal from the top of the reactor building completed (October 11, 2013)•Installation of fuel removal cover and fuel handling facility planned•Steel frame debris dropped into SFP (September, 2012)•Beginning target of fuel removal activities rescheduled from the perspective of getting safety most prioritized(Changed from the end of December, 2014 to the end of September, 2015)
Tasks•Due to high radiation levels, radiation dose reduction measures must be conducted safely and steadily withremote-controlled heavy machinery.

Completion ofdebris removal
As of Oct. 11, 2013

Damaged byhydrogen explosion
As of Feb. 12, 2012
Measuresagainstrainwater(protection
againstrainwater)

North

Present
Fuel handling machine
Crane

Fuel removal
Image of Fuel removal
cover
cover structure

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Toward fuel debris removal (Fuel removal from SFP)
 With remotely operated heavy machinery, the removing activity of debris from the top floor
completed (October 11, 2013)
 Fuel removal from spent fuel pool continuously conducted Currently developing/implementing the plan for decontamination and shielding against radiationN

Photo taken on March 24, 2011
Before large debris removal
N

Photo taken on April 19, 2014
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

After removal of large debris

24

Toward fuel debris removal (Preparation for fuel debris removal)

25

Water flow from area near MSIV room to floor drain funnel on 1st floor in R/B
at Unit 3On January 18, 2014, checking the camera images from the debris removal robot (ASTACO-SoRa) in unit 3, our personnel found thatwater flowing from the area near the door of the main steam isolation valve (MSIV) room toward the floor drain funnel in the vicinity inthe north-eastern area on the 1st floor at Unit 3 R/B.
On January 21, 2014, it was identified that water injection amount was greatly reduced while the robot was operated for debris
removal work.
No change on plant parameter, etc has been found.

North

Floor drain
funnel(RF-123B)

Water flow

Floor drain funnel
Water flow confirmed (on Jan. 18)

MSIV
room

Remote-controlled
heavy machinery(ASTACO-SoRa)
Floor map of 1st floor in R/B at Unit 3

Water flow reduction confirmed(on Jan. 21)

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

26

Finding of leakage at the Unit 3
 On May 15, by inserting a camera into the Main Steam Isolation Valve (MSIV) room, a leak fromaround a Main Steam (MS) line was identified. It was the first confirmation of a leak from the Unit 3
PCV.

Expansion joint Ｃ
構台
福島第一
安全第一
福島第一
福島第一
安全第一
安
全
第
一

Expansion joint Ｄ

Pan-tilt camera

Water flow

Pan-tilt camera

injection

Dose monitor

Endoscope camera
Endoscope camera
R/B 2nd floor
HVAC room

安全第一
福島第一

Penetration on
PCV by MS pipes
R/B 1st floor
MSIV room

Backup penetration（X-46,47）

MS process
radiation
monitorFeed water penetration（X-9A,B）

O.P.13270
Level of water inside
PCV(estimated by water head)

O.P.12020～12090
O.P.11670

Ｂ

Ａ

PCV side

O.P.15280
Feed water pipes

grating

Ａ

Ｂ

Ｃ

Ｄ

MS pipes

MS penetration（X-A to D）

O.P.10610
MS drain penetration（X-8）

Penetration on PCV in MSIV room
All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Cross section of MSIV room

Current Status of Unit 4
Current Status•Fuel removal from SFP commenced (November 18, 2013, target by the end of year 2014)

Tasks•Continuing work while ensuring safety•Exploring the methodology for the removal of the fuels with their leaks confirmed

As of Sep. 22, 2011

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Fuel Removal Cover Structure
Present27

Toward fuel debris removal (Fuel removal from SFPs)
Defueling cover
Fuel
handling
facility

Crane

Work environment
arrangement area (within dot
line)

Fuel handlingmachine (FHM)

Spent fuel pool (SFP)
Fuel assembly
Spent fuel storage rackOn-sitetransporting cask

28

 Fuels have been removed from Spent Fuel Pool (SFP) in Unit 4 sinceNovember 18, 2013.
 1533 fuels was stored inside SFP at the time of starting fuel removal.
They are scheduled to be completely removed by the end of year2014.
 1188 fuels have been already removed and transported to common
fuel pool on site as of June 30, 2014.
キャスク
ピット
Cask pit

Fuel removal

Storage area
貯蔵エリア

キャスク
ピット

Ensuring

空きスペース
emptyの確保
space.

Common pool on site

On-site transport<Loading the cask on transporting vehicle>

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Cask pit<Fuel removal activity＞

Improvement on work environment

29

Workers：approximately 5,000 persons per day (As of June, 2014)◇ Efforts to reduce the area where full-face mask should be worn and to reduce radiation dose for site workers◇ Welfare facilities
 Mobile rest facility by modifying large bus (operated since January, 2014)
 Large rest facility (with 8 story building, can accommodate approx. 1200 persons, will be operated by the endof December, 2014.)
 Cafeteria (will be constructed in Okuma-town by the end of March, 2015, can supply 3000 meals)◇ improvement on environment of work place Temporary administrative building (can accommodate 1,000 TEPCO employees, operated in order from July,
2014)
 Permanent administrative building (will accommodate TEPCO employees plus contractors, will be
constructed by the end of March, 2016) Damaged vehicles at the sea side of T/B with high radiation have been removed as rubbles.
Area reduction where full-face mask should be worn
Conventional area
Additional area
Tank area

Two thirds
or more of
Daiichi site

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Removal of damaged vehicle rubbles（Before ）（After ）Promotion of decommissioning works at Fukushima Daiichi NPS

30

 Fukushima
Fukushima Daiichi
Daiichi Decontamination
Decontamination andand Decommissioning
Decommissioning Engineering
Engineering Company
Company(FDEC)(FDEC) was
was establishedestablished toto control
control thethe entire
entire decommissioning-related
decommissioning-related divisions.
divisions.
Decommissioning
Decommissioning andand measures
measures against
against contaminatedcontaminated water
water issue
issue will
will bebe expedited
expedited as
as aaJapaneseJapanese government
government projectproject byby collecting
collecting thethe wisdom
wisdom fromfrom experts
experts inside
inside andand outside
outside ofofJapan.
Japan.

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

31

Expectation to IRID (1/2)

 To
To go
go aheadahead with
with Fukushima
Fukushima Daiichi
Daiichi decommissioning
decommissioning works
works safely
safely andand steadily,steadily, R&D
R&D
isis essential,
essential, such
such asas development
development ofof remote-controlled
remote-controlled device
device etc.
etc.
AsAs forfor decontamination
decontamination device
device andand device
device forfor identifying
identifying PCV
PCV leakleak locations
locations withwithremoteremote control,
control, desired
desired results
results areare gradually
gradually being
being obtained
obtained with
with verification
verification testing.
testing.
 R&D
R&D isis imperativeimperative forfor waterwater sealing
sealing inin S/C,
S/C, inside
inside investigation,
investigation, filling
filling water,water, fuelfuel debris
debrisremovalremoval in
in PCV
PCV toto achieve
achieve fuelfuel debris
debris removal
removal inin thethe future.
future.
Units 1 to 2
Fuel removal from
SFP

Unit 3

Rubbleremoval,clean-up

Unit 4
Installation offuel removal
facility

Fuel removal

Storage/Trans
port

Units 1 to 3
Fuel debris removal(molten fuel)Clean-up,
Investigationof leaklocation

Water sealing,filling water

Dismantling plant etc.

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

Fuel debris
removalDeveloping
scenario andtechnology

Storage/Trans
port

Designing andmanufacturing
equipment

Dismantlingetc.

Expectation to IRID (2/2)
Collecting knowledge and experience inside and outside of Japan
based on needs and challenges in terms of decommissioning ofFukushima Daiichi nuclear power station, screening and giving anexpert opinion on technologies
Collecting prospective technologies in request for proposals of alternativefuel debris removal
Developing element technologies with an eye on using flexibly in the futuredecommissioning work

Developing technologies and equipment in considering the reality ofthe situation and the time frame requirement
The element technologies closely relevant to the site can be applied to thesite, such as the suction and blast decontamination equipment used insidebuildings

Through close information exchange and cooperation with IRID,
Fukushima Daiichi D&D company strive to resolve the challenges faced
at the site

All Rights Reserved ©2014 The Tokyo Electric Power Company, Inc.

32

For more information33

 Updated information regarding decommissioning is shared on TEPCO website.
http://www.tepco.co.jp/en/decommision/index-e.html

Click<Result of radioactive analysis around
Fukushima Daiichi NPS map imaging>
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