Innovative Approach for Fuel Debris Retrieval
Results of Request for Information (RFI)
April 25, 2014
International Research Institutefor Nuclear Decommissioning©International Research Institute for Nuclear DecommissioningProcess from issuing an RFI
to receiving information©International Research Institute for Nuclear Decommissioning

2

Purpose of Request for Information (RFI) IRID has been entrusted by Agency for Natural Resources and Energy with technicalinvestigation on Innovative Approach for Fuel Debris Retrieval and conducted Request for
Information (RFI) as part of this technology investigation.
 In this RFI, we verify innovative approach for Fuel debris retrieval which was proposed in
the Mid-long-term roadmap*1 Thus we collect information from wide range of organizationfrom the industry to academic institutions to government agencies to determine thetechnology required.
 Information collected will be utilized for Conceptual Study (C/S) and technological
Feasibility Study (F/S)*2 in the future.
 Also, we hope this RFI will be the opportunity for the people involved in this project tocollaborate with link to other parties around the world.
*1:”The technology to submerge up to the upper part of a reactor containment affected by a severe accident has
difficult challenges in its many steps. Therefore it is assumed that it might be difficult to submerge up to the upperparts of the reactor containments. In addition, methods of retrieving the fuel debris without filling the PCVs withwater will be studied as alternative methods.” (from Mid-long-term roadmap)＊2:To be held in Spring/Summer of 2014 depending on the condition of government budget.

©International Research Institute for Nuclear Decommissioning

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Contents of RFI
Topic A: Internal PCV/RPV investigation

Topic B: Fuel debris retrieval

A-1:Conceptual study of method (following are samples)

B-1:Conceptual study of method (following are samples)

1. Method of inserting investigation device such as
cameras inside.
a. Utilize current throughbore such as
piping/penetration.
b. Create new throughbore .

1.
2.
3.
4.

Access to fuel debris from the top of PCV underwater
Access to fuel debris from the top of PCV in the air*1
Access to fuel debris from the side of PCV in the air*1
Access to fuel debris from the bottom of PCV in the air*1*1 including partial submergencec. Methods of Shielding penetrations and of
equipment operation in terms of reduction ofradiation exposure.

B-2:Required technologies (following are samples)
1. Technology regarding fuel debris retrieval (cutting,suction).
2. Method of detecting fuel debris location by
2. Equipment/device such as remote control manipulator,
measurement outside, etc.
with superior control capability from long distance.
3. Technology of shielding against fuel debris with
A-2:Required technologies (following are samples)high radiation.
1. Advanced measurement technology (camera,
4. Device and equipment under the high radiation
dosimeter, thermometer etc. )environment.
a. High performance optical equipment(camera etc. ),5. Equipment/device to create a borehole on theother measurement technology (ultrasonic, laser
building concrete and PCV to access from the sideetc.)
or bottom of the PCV.
b. Control technology of measuring instrument, and
6. Technology to store fuel debris safely in PCV/RPV
information transmission technology .
before retrieving.
2. Technology to detect whether the substance in thereactor is fuel debris or not.
©International Research Institute for Nuclear Decommissioning4

Announcement on RFI procedures andpromotion for invitation
IRID has been promoting publication and application for RFI, and announcement of RFI procedures since
fall of 2013 as well as providing reference information necessary for the study.
Announcement of RFI procedures andOutline of activities
Promotion activity of RFI invitation•Nov.

Opened website for invitation.
Held overseas workshop.

•Establishment/
announcement
on RFI
procedures

Sent reminder mail.
•Dec.

Announced RFI procedures .

•Holding ofworkshop

Held domestic workshop.
Set up web forms forapplication.
Uploaded basic data ofFukushima Daiichi NPS on the web. .
•Jan

Uploaded technical issues･
related R&D status.
Sent reminder mail.

• Provision ofreference info
for related
technology.
•Delivery of
RFI notice Established Entry form as well as opened website forapplication and announced procedures for RFI for
applicant’s convenience.
 Held workshop in Japan and overseas forthe publication of background and purpose of RFI
and promoted invitation.
Venue : UK, France, US, Canada, Germany and Japan.
- Tens of people attended from related company,
R&D agency for each workshop.
About 130 participants from Japan.

 Disclosed reference technology data on the website
for information collection for RFI- Basic data of Fukushima Daiichi NPS (Structure /external
dimension etc.)- Technical issues and status of R&D in Japan/overseas.

 Made announcements regarding implementation of RFI
and uploading of reference information for followings.
- Overseas and domestic related academic meeting , andindustry organization.
- Companies participated in previous workshop .

©International Research Institute for Nuclear Decommissioning5

Results of RFI
About 60% of information was provided from Japan, and about 40% from overseas countries.

Total

JPN

US

Breakdown by country
GER
UK
FRA
BEL

A-1：Conceptual
study for the
method.

33

20

7

3

-

2

A-2：Required
technology

58

32

6

10

6

B-1：Conceptual
study
for the method

43

23

8

3

B-2：Required
technology

60

41

7

Total (No. of items
of information)

194

116

28

•Field of information for RFI
Topic A
Internal PCV/RPV
investigation
Topic B
Fuel debris
retrieval

CAN

RUS

-

1

-

2

2

-

-

2

5

-

1

1

3

4

2

2

-

1

19

12

11

4

2

2

We deeply appreciate your valuable information.
©International Research Institute for Nuclear Decommissioning

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Explanatory CG for
Submersion Method for Fuel
Debris Retrieval©International Research Institute for Nuclear Decommissioning

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Definition of Technical Terms
Submersion method Method to retrieve fuel debris in a submerged condition in which fuel debris is cut and stored under water
Dry method Alternative method, in which fuel debris is cut and stored in air, or cut underwater but stored in air, against theSubmersion method

Examplesbarrier

Submersion method

100t polar cranecontainer
Operation floor

Canistermanipulator

manipulator
・cut/store
equipment
・grabbingequipment etc.

RPV

PCV

Torus room

100t polar cranecontainer
Operation floor

barrierDry method

manipulator

ＤＳP

SFP

ＤＳP

SFP

Canister

RPV

PCV

Torus room

Fuel debris cut and stored under water・cut/store
equipment
・grabbingequipment etc.

100t polar cranecontainer
Operation floor

ＤＳP

SFP

・cut/store
equipment
・grabbingequipment etc.

barrier

RPV

PCV

Torus room

Fuel debris stored in air

Canister

Fuel debris cut and stored under water (PCV partial submersion)
100t polar cranecontainer
Operation floor

barriermanipulator
・cut/store
equipment
・grabbingequipment etc.

ＤＳP

SFP
RPV

Canister

PCV

Torus room

Fuel debris cut and stored in air©International Research Institute for Nuclear Decommissioning

8Categorizing Provided
Information©International Research Institute for Nuclear Decommissioning9

表3 燃料デブリ取り出し代替工法についてご提供いただいた情報の分類とキーワード

Information handling process in IRID

トピックス

A-1：概念検討

機器を内部に投入
PCV外部からの測定

直接測定

A：PCV/RPVの内部調査

Study of Provided
Information

大分類

直接観察

間接測定
A-2：必要とされる
技術

Brain Storming

コアボーリング、SFPアクセス

3

スネークアーム、水中からのアクセス、潜水艦型ハッチ、エアロック

3 側面（新たに穿孔して）
4 側面
5 下部

3
2
1

遠隔操作、マニピュレータ、デコミ、除染、過去の経験
ミューオン、γ 線、X線、超音波
音波

6 放射線

8

中性子、γ 線カメラ、スネーク型ロボット、SiC半導体測定器、放射線強度マッピング、分光計、ダイヤモン
ドセンサ、耐放射線センサ、センサアセンブリ

7 熱
8 元素分析

1
2 (2)

崩壊熱
レーザー誘起ブレークダウン分光（LIBS）、パルスレーザー、プラズマ、輝線、遠隔分析

9 カメラ

10

内視鏡測定ツール、PTZカメラ、放射線センサ、温度センサ、光導電膜、冷陰極、耐放射線性、解像度、外装カバー、水中

10
11
12
13
14
15
16

ファイバースコープ
超音波
レーザースキャナ
その他
ミューオン
X線、γ 線、中性子
AE法

2
6
2
1
4
3
1

レボルバー、石英ガラス、耐放射線
ソナーマッピング、画像解析、UVP法、非線形法、水中センサ（WBS）、3Dマッピング
実寸法、水中、気中
燃料デブリ位置検索
３D、可視化
γ 線計測器、固体飛跡記録計、デジタルＸ線パネル検知器
内部弾性エネルギー、音波、電気信号変換、非破壊的評価

17

臨界管理・被ばく線量シミュ
レーション

5

３D、未臨界状態の確認、希ガス、Kr-88、シミュレーションソフト、バーチャルリアリティ、放射線分布地図

18
19
20
21
22
23

水位
ホットセル
光源
マニピュレータ
ロボット（水中）ロボット（陸上）

2
1
1
5
2
6

アクセス技術24 ロボット（水陸両用）

6S/C水位、超音波探触子(UT) 、中性子後方散乱探査機、壁面移動車両
放射性試料、化学分析、隔離
シンチレータ、硫化亜鉛、太陽光発電
マルチセグメントアーム、ロングリーチ、軽量化
潜水艇、潜水ロボットシステム
クローラー、潜水、測定器搭載
スネークアーム、磁石接着、ばね鋼、代理環境、試験設備、ロボット性能向上、遠隔操作無人探査機、スイングドライブ式、小型連携式、アルキメデススクリュー
ハイスピードコアドリル、遠隔、超高圧液体窒素吹き付けによる穿孔、研磨材混入による鋼板切断、レーザー切断、小反力、トンネル技術
電子機器、環境対応型水圧駆動制御技術、無線LAN、通信用光ファイバーケーブル、石英ガラス大口径
ファイバ、高光エネルギー伝送、高出力レーザー光、1MGyの耐放射線性能、集積回路
炭酸ガスで粉砕したデブリを浮上させる工法、凍結させ止水する工法など冠水させた状態で下からアクセスする工法

気中工法*2

B：PCV/RPVからのデブリ取り出し

その他

デブリ切断

デブリ回収

B-2：必要とされる
技術
環境整備

アクセス技術Clarification of Technological
Key Factors

C：その他

キーワード

1

2 側面（既存のペネを通して）25 切断・穿孔

626 耐放射線部品

10

27 上部
28 下部

5
2

29 上部

7

回転プラグを用いた工法、プラットフォームを下ろし上から順に解体する工法、マニピュレータを用る方法、
上部から機器が収納されたカプセルを下す工法、鉄のキューブにより遮蔽する工法など

30 上部・側面併用

7

プラットフォームを下ろし上から順に解体する工法、開口部に遮蔽機能付きの部屋を設ける工法など

7

デブリ・炉内構造物を裁断しロボットアームで取り出す工法、新たなエアロックを設ける工法など

31 側面

Categorizing and Sorting

提案件数*1中分類

1 上部（新たに穿孔して）環境整備

冠水工法*2B-1：概念検討

No.

テーマ外

32
33
34
35
36
37

下部
化学的方法
RPV/PCV以外
その他
機械的
熱的（プラズマ）

4 (1)
3
2
2 (6)
5 (2)
1

建屋下に穴を掘って回収する工法など
デブリを化学的に溶解させる方法、電気メッキ手法
RPV/PCV以外の場所にデブリがある場合の回収方法
建屋ごと埋設する方法など
掘削機、カッター、ウォータージェット、超高圧液体窒素、放電破砕
アーク、ジェット

38 熱的（レーザー）

8 (1)遠隔、ファイバーレーザー、レーザー塗膜除去装置、超音波による距離把握、水中切断、気中切断、CO2
レーザ

39
40
41
42

安定固化
分類
容器（一時保管）
被ばく管理

4
1
4
2

Hot Isostatic Pressing、Inprementable Graphite Mtrix、保管計画立案
中性子/γ 線によるデブリの同定
輸送、処理、コンテナ、キャニスター
表面汚染サーベイ装置、シミュレーションソフト、3Dバーチャルリアリティ

43 遮蔽

5 (1)

ガンマ線遮蔽材、中性子遮蔽材、黄鉄鉱を用いた重コンクリート、鉄スケール、遮蔽解析、液体状遮蔽材、高比重樹脂

44 除染
45 止水
46 水処理32 (2)3

化学除染、RTVレジン
流動性セメント、流動性グラウト材
ゲル化、スラッジ、ポリリン酸、キレート回収

47 マニピュレータ

12

テレスコープ式、昇降ワイヤ式、稼動脚付き、モバイルツールプラットフォーム、大型マストアーム、油圧式、双腕型グリッパー、耐放射線性能、ＣＦＲＰ製

48 ロボット（デブリ除去）
49 切断・穿孔50 テーマ外3 (1)17キャタピラ、稼動構造体自動施工
乾式穿孔ドリル、遠隔解体重機
調査戦略、スタック転倒防止、自立低高度空中放射線検出装置、公募方法など*1 トピックスの分類は、IRIDが独自に再評価したため、提案者の分類と異なる場合がある。()内は、汚染水RFIのうち燃料
デブリRFIにも該当すると考えられるもの。
*2 冠水工法（燃料デブリの切断と収納容器への収納をすべて水中で行う工法）、気中工法（燃料デブリの切断と収納容器への収納のうち、一部もしくは全てを気中で行う工法）。

(Please see handout)

A variety of information was categorized and sorted out toobtain the grand view of the provided information.
©International Research Institute for Nuclear Decommissioning

10Categorizing Provided Information
A: PCV/RPV internal investigation
A-1: Conceptual studyst

1 tierNo.
classification

2nd tier classification

From top (through new
boreholes)
From side (through2
existing penetrations)
From side (through new
3boreholes)
1

Placingequipment in
PCV/RPV

Measurement 4 From sidefrom outside
5 From bottomof PCV

Number of
responses

1
3
3

2
1

＊Category of topics may be different from the one
registered by applicant since IRID individually re-evaluates
the information. The number in the bracket is the one of
RFI submitted for Contaminated water issue, which is reevaluated from the viewpoint of RFI for fuel debris.

st

A-2: Support technology

1 tierNumber ofNo.
2nd tier classification
responses
classification
6 Radiation
8
Direct7 Thermal
1
measurement
8 Element analysis
2 (2)9 Camera10
10 Fiber scope
2
Direct11 Ultrasonic waves
6
observation
12 Laser scanner2
13 Others
1
14 Muon4
Indirect
15 X-rays, γ-rays and neutron3
measurement
16 AE method
1
Criticality control &17
5
exposure simulationWork2
environments 18 Water level
maintenance 19 Hot cell1
20 Lighting
1
21 Manipulator
5
22 Robot (underwater)
2
23 Robot (land)
6
Access24 Robot (amphibious)
6
technology
25 Cutting and boring tools
6
Radiation-resistant26©International Research Institute for Nuclear Decommissioning
10
components
11Categorizing Provided Information
B: Debris retrieval from PCV/RPV / C：Others
B-1: Conceptual studyst

1 tierNo.
2nd tier classification
classification
Submersion 27 From top
method28 From bottom
29 From top
From top - from side30
(combined approach)Dry method
31 From side
32 From bottom
33 Chemical method
Others34 Other than PCV/RPV
35 Others

Number of
responses

5
2
7

7
4 (1)
3
2
2 (6)

1 tierNo.
2nd tier classification
classification
Outside the
50 Outside the scope of RFI
scope of RFI

Number of
responses

7B-2: Support technology

1 tierNo.
2nd tier classification
classification
36 Mechanical
Debris cutting 37 Thermal (plasma)
38 Thermal (laser)

7

C：Othersst

st

Debrisretrieval

39 Sorting
40 Category
Container (for temporary
41
storage)
42 Exposure management

43 ShieldingWork
environments 44 Decontamination ofcontainers
maintenance
45 Water stoppage
46 Water treatment

Accesstechnology

Number of
responses

5 (2)
1
8 (1)
4
1
4
2
5 (1)
3
2 (2)
3

47 Manipulator

1248 Robot (for debris retrieval)

3 (1)49 Cutting and boring tools

1• Submersion method (both processes of cutting off fuel debris and storing into storage container are carried out underwater).
• Dry method (either or both processes of cutting and storing fuel debris is carried out in the air).
©International Research Institute for Nuclear Decommissioning

12

Introduction of Provided Information- Methods -©International Research Institute for Nuclear Decommissioning

13

Internal
investigation

Shield plug

Barrier

Operation floor

Major issues
・Ensure work space
・Ensure boundaries

DS pitSpent fuel pool

Transport equipment

Guide tube

RPV

Viewing equipment
Monitoring equipment etc.

PCV
Torus roomFig 1. Method to drill from the top (from shield plug) 【category 2nd tier No.1】©International Research Institute for Nuclear Decommissioning

14

Internal
investigation

Work platform

Shell wall

Barrier

Major issues
・Ensure boundaries
・Location ofdrilling/drilling
technology

Operation floor
DS pitGuide tube

SFP

Transport equipment

RPV

Existing openings etc

Viewing equipment
Monitoring equipment etc

PCV
Torus roomFig 2. Method to drill from the top (from SFP) 【category 2nd tier No.1】©International Research Institute for Nuclear Decommissioning

15

Internal
investigation
Operation floor

DS pitSpent fuel pool

Major issues
・Access distance・Access method to RPV

Vent tube
Drilled opening/Existing opening

RPV

PCV

Barrier

Torus room

Guide tube

Viewing equipment
Monitoring equipment etc

Transport equipment

Fig 3. Method to survey lower PCV from vent tube 【category 2nd tier No.2】©International Research Institute for Nuclear Decommissioning

16

Fuel debris retrieval

Operating device(Shielding plug)

100t class polar craneBarrierContainer

Ventilationequipment

Operation floor
Operating device(telescope etc)

Spent fuel pool

DS pitOperatingdeviceCutting device
Visual device
etc.

RPV

Ventilation equipment

PCV
約35m

Extension/contraction

Major issues
・Ensure boundaries
・Setting precision of therotating plug・Control of repulsive force
during cutting

Torus roomFig 4. Method to retrieve fuel debris in air by rotating plug 【category 2nd tier No.29】©International Research Institute for Nuclear Decommissioning

17

Fuel debris retrieval
100t class polar craneOperating device(gate type crane etc. )Ventilationequipment

Container
Operation floor
Spent fuel pool

Barrier with shielding
function

DS pitCutting device
OperatingdeviceVisual device
etc.

Descening platform

RPV
Ventilation equipment

PCV

Major issues
・Ensure boundaries
・Radiation shielding
during operations

Torus roomFig 5. Method to retrieve fuel debris in air by descending work platform【category 2nd tier No.29】©International Research Institute for Nuclear Decommissioning

18

Fuel debris retrieval
100t class polar crane

Major issues
・Ensure boundaries
・Radiation shielding
during operations
・Location of entrance
opening

Container
Operation floor

DS pitSpent fuel pool

Existing equipment
hatch/new opening

Operating device
Cutting device
Visual device etc.

Barrier with shielding
function

RPV

Ventilationequipment

PCV

Torus room

Ventilationequipment
Operating device
Access route
Operating device

Fig 6. Method to retrieve fuel debris in air from the side 【category 2nd tier No.31】©International Research Institute for Nuclear Decommissioning

19

Introduction of Provided Information- Technology -©International Research Institute for Nuclear Decommissioning

20

Visual technology e.g. Camera, endoscope, and fiber scope
Monitoring technology e.g. Radiation measurement, ultrasonicprobe, laser scanner, and element analysis

Transport technology e.g. Self-propelled robot (snake type, crawler
type, and submergence type), manipulators (elevator, moving mechanism)

Cutting technology e.g. Plasma cutting, laser cutting, mechanicalcutting, and core boring

Supporting technology e.g. Criticality control, debris
stabilization/solidification, radiation resistant parts, etc.
OP floor

ＤＳP

A variety of technologicalinformation from the radiation
resistant camera to various
manipulators to laser cutting
techniques was provided.

SFP
RPV

①
⑤
③

②

③

③

PCV

②

③

④ ①

Torrus④©International Research Institute for Nuclear Decommissioning

21

Key Factors for Methods and Technology
 Maintain boundaries to prevent release of radioactive materials andcontamination
 Enable remote control to keep low exposures for workers
 Avoid interference with existing structures Adapt to operations in air (high dose and high humidity)
 Facilitate maintenance and/or enable long continuous use
In addition, for fuel debris retrieval operations, Establish support facility, such as, ventilation/water filtering/fuel debris
cooling Consider fitness of large scale equipment to conditions of each unit Ensure superb radiation resistance for operations in fuel debris vicinity

These factors will be reflected tothe specifications of RFP.
©International Research Institute for Nuclear Decommissioning

22

Category and Keywords of Information Provided for Innovative Approach for Fuel Debris Retrieval
stTopics

1 tierclassificationNo.
1

A-1: Conceptual
study

Placingequipment in
PCV/RPV

3
Measurementfrom outside of
PCV

Directmeasurement

A: PCV/RPV internal investigation

Directobservation

Indirectmeasurement
A-2: Support
technology

2

W ork
environments
maintenance2ndNumber of
responses *1tier classification

From top (through new
boreholes)
From side (through existing
penetrations)
From side (through new
boreholes)

1

Core boring, Access from SFP

3

Snake-arm, Access from under the water, Submarine-type hatch, airlock

3

Remote-control, Manipulator, Decommissioning, Decontamination, Track record

4

From side

2

Muon, γ-ray, X-ray, Ultrasonic wave

5

From bottom

1

Sound wave

6

Radiation

8

Neutron, γ-ray camera, Snake type robot, SiC semiconductor measuring instrument, Radiation Intensity Mapping,Spectrometer, Diamond sensor, Radiation Resistance Sensor, Sensor Assembly

7

Thermal1

Decay heat

8

Element analysis

2 (2)LIBS (Laser-Induced Breakdown Spectroscopy ), Pulse laser, Plasma, Bright line, Remote analysis

9

Camera10

Bore camera, PTZ camera, Sensors (radiation, temperature), Photoconductor, Cold cathode, Radiation
resistance, Resolution, Outer cover, Underwater

10 Fiber scope2

11 Ultrasonic waves

6

12 Laser scanner

2

Revolver, Quartz glass, Radiation resistance
Sonar mapping, Image analysis, Ultrasonic velocity profiler method, Non-linear method, W BS (W ater-Borne
Sensor), 3D mapping"as-built" dimension survey, Underwater, In-the-air

13 Others
14 Muon
15 X-rays, γ-rays and neutron

1
4
3

Debris location search
3-D, Visualization
γ-ray measuring instrument, Solid state track records, Digital x-ray panel detector

16 AE method
Criticality control & exposure
17
simulation
18 W ater level

1

Internal elastic energy, Sound wave, Electric signal conversion, NDE

5

3D, Sub-criticality monitoring, Inert gas, Kr-88, Simulation software, Virtual reality, Radiation dose rate map

2

S/C water level, UT probe, Neutron back-scattering, On-the-wall vehicle

19 Hot cell

1Radioactive specimens, Chemical analysis, Isolation

20 Lighting

1

Scintillators, Zinc sulfide, Solar power

21 Manipulator
22 Robot (underwater)
23 Robot (land)

5
2
6Multi-segment arm, Long-reach, W eight reduction
Submersibles, Submarine robot system
Crawler, Submergence, Sensor-loading

24 Robot (amphibious)

6

Snake-arm, Magnetic adhesion, Spring steel, Surrogate environments, Test facility, Improvement of robotic
systems performance, Remotely operated vehicle, Swing-drive mechanism, Small linkage system, Archimedes
screw

25 Cutting and boring tools

6

High-speed core drill, Remote control, NitroJet boring, Steel plate cutting with abrasive, Laser cutting, Compact
repulsive force, Tunneling technology

Radiation-resistantcomponents

10Electronic devices, W ater-driven controller, W ireless LAN, Optical fiber cable, Quartz glass large diameter fiber,High light energy transmittance, High power laser beam, 1MGy radiation resistance, Integrated circuits.

27 From top

5

Collecting floating crushed debris by carbon dioxide gas, W ater stoppage by freezing etc.

28 From bottom

2

29 From top

7

Access from the bottom in the state of being submerged.
Rotating plug method, Dismantling from top portion by pulling down the platform, Using manipulator, Pulling down
the capsule storing equipment from the top, Shielding by iron cube

Accesstechnology

26
Submersion*2
methodB-1: Conceptual
study

Dry method*2

7Hanging type work platform, Setting up a room with opening equipped with shielding function

7

Retrieving the cut debris and reactor internals by robot arm, Installing new airlock

B: Debris retrieval from PCV/RPV

32 From bottom
33 Chemical method
34 Other than PCV/RPV

4 (1)
3
2

Collecting from the bottom of the building through the drilled hole
Dissolution of debris by chemical agents, Electroplating
Removing debris in the areas other than RPV/PCV

35 Others
36 Mechanical
37 Thermal (plasma)

2 (6)
5 (2)
1

38 Thermal (laser)

8 (1)39 Sorting
Debris retrieval 40 Category
Container (for temporary
41
storage)
42 Exposure management41
4Transport, Treatment, Container, Canister2

Surface contamination meter, Simulation software, 3D virtual reality

43 Shielding

5 (1)

W ork
environments
maintenance

Accesstechnology

C：Others

From top - from side
(combined approach)

Embedding the building itself etc
Excavator, Cutter, W ater jet, High pressure liquid nitrogen, Electric discharge impulse crushing
Arc, jet
Remote-control, Fiber laser, Removal apparatus for laser coating film, Detecting distance by ultrasonicmeasurement, Underwater cutting, Dry cutting, CO2 laser
Hot Isostatic Pressing, Inprementable Graphite Matrix, Storage plan
Differentiation of debris and non-debris by neutron or γ-ray

Debris cutting

B-2: Support
technology

30

31 From side

OthersKeywords

Outside thescope of RFI

Gamma-ray-shielding materials, Neutron shielding, Heavy concrete using pyrite, Iron scale, shield analysis, Liquidshielding, High specific weight resin

Decontamination ofcontainers
45 W ater stoppage

2 (2)46 W ater treatment

3

Gelation, Sludge, Polyphosphoric acid, Chelate collection

47 Manipulator

12

Lifting telescope, Lifting wires, Movable leg, MTP (Mobile Tool Platform), Large mast arm, Oil pressure type,Double gripper, Radiation resistant ability, CFRP

48 Robot (for debris retrieval)

3 (1)Caterpillar, Construction robot w/o human intervention

49 Cutting and boring tools

1

Dry type drill, Remote dismantling machine

50 Outside the scope of RFI

7

Search strategy, Stack fall-down prevention, Aerial radiation monitoring by drone, RFI/RFP method etc.

443Chemical decontamination, RTV resin
Flexible cement or grout*1 Category of topics may be different from the one registered by applicant since IRID individually re-evaluates the information. The
number in the bracket is the one of RFI submitted for Contaminated water issue, which is re-evaluated from the viewpoint of RFI forfuel debris.
*2 Submersion method (both processes of cutting off fuel debris and storing into storage container are carried out underwater), Dry
method (either or both processes of cutting and storing fuel debris is carried out in the air).

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