Nuclear Damage Compensation and Decommissioning Facilitation Corporation

Technical Strategic Plan 2021
for Decommissioning of the Fukushima
Daiichi Nuclear Power Station ofTokyo Electric Power Company Holdings, Inc.
(Explanatory Material)
October 29, 2021
Nuclear Damage Compensation andDecommissioning Facilitation Corporation

NDF

Copy right. All right reserved.
©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

Table of Contents
１．Introduction
２．Concept on risk reduction andsafety assurance fordecommissioning of the
Fukushima Daiichi NPS
３．Technological strategies toward
decommissioning of the
Fukushima Daiichi NPS
3.1 Fuel debris retrieval
3.2 Waste management
3.3 Contaminated and treated water
management
3.4 Fuel removal from spent fuel pools

５．Efforts for research anddevelopment
６．Activities to support our
technical strategy
6.1 Project management
approach
6.2 Strengthening ofinternational cooperation
6.3 Local community
engagement

４．Analysis strategy for promoting
decommissioning1

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

1. Introduction

１．はじめにFour key技術戦略プラン2021の４つのポイント
aspects in Technical Strategic Plan 2021

➢ The Technical Strategic Plan 2021 presents mid-to-long-term
technical strategy by focusing on the following four key
aspects of this year.
First

Proposed Prospects of a processing/disposal method
and technology related to its safety

SecondIssues to be addressed for the trial retrieval tominimize the impact of the COVID-19 infection

Third

Summary of issues to be discussed for the selection of
methods for further expansion of fuel debris retrieval

FourthEfforts for the ALPS-treated water2

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

１．はじめにDivision of roles of related organizations responsible
福島第一原子力発電所の廃炉に係る関係機関等の役割分担
for decommissioning of the Fukushima Daiichi NPS

1. Introduction

Nuclear Emergency Response Headquarters (Director: Prime Minister)Council for the Decommissioning of TEPCO's Fukushima Daiichi Nuclear Power Station*1

Mid-and-Long-Term Roadmap

The Team for Countermeasures for Decommissioning
and Contaminated Water Treatment(Head of Team: Minister of Economy, Trade and Industry)➢ Progress management of each countermeasure according toMid-and-Long-Term Roadmap
Report on theoutcome

Progressmanagement

Granting of
project budget

Mid-to-Long-Term risk map

Minister of Economy, Trade and Industry
Presentation ofimportant issues

Approve

Apply forapproval

Nuclear Damage Compensation and Decommissioning Facilitation Corporation➢ Development of a mid-to-long-term strategy
Withdrawal plan
Technical ➢ Tech. support for progress management of important
issues (in collaboration)
Strategic ➢ R&D planning and progress management
plan ➢ Strengthen international partnershipReserve Fund for➢ Management of Reserve Fund for
Decommissioning
Decommissioning

International Research Institute for
Nuclear Decommissioning (IRID)*2
Share progress
Japan Atomic Energy Agency (JAEA), and challengesetc.
➢ R&D implementation
ReportAdvice, guidance, recommendations,supervision and support
Reserverelated to project management, etc.

Disburse-ment

Apply for report

R&D organization

Nuclear Regulation Authority➢ Approval of implementation
plan, pre-service inspection,
welding inspection, etc.
➢ Providing goals fordecommissioning

Monitoring, examination

ReportReportBidirectional dialogue

Local residents and communities

Organizations related to decommissioning➢ Decide the direction of decommissioning and contaminated water
treatment(Chairperson: Chief Cabinet Secretary)Tokyo Electric Power Company Holdings, Inc. (Fukushima Daiichi Decontamination and Decommissioning Engineering Company)➢ Contaminated water and ALPS-treated water management, fuel removal from SFP, fuel debris retrieval, waste management, entire sitemanagement, etc.
Mid-and-Long-term➢ Through TEPCO's management reform, the funds required for decommissioning should be reserved
Decommissioning Action Plan
responsibly (Implementation of the 4th special business plan)➢ Detailed measures for facility safety and protection of nuclear fuel material (Development of implementation plan for specified nuclear facility*1 In response to the ALPS-treated water disposal policy decided on April 13, 2021, “Council for the Decommissioning of TTEPCO’s Fukushima Daiichi NPS toward steady implementation of basic policy on ALPS-treatedwater disposal” was founded.
*2 TEPCO, a decommissioning project operator, participates as a member of IRID and shares the needs, challenges, and results of research and development.

3

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

1. Introduction

１．はじめに

福島第一原子力発電所の廃炉に係る関係機関等の役割分担
Positioning技術戦略プランの位置づけ
of the Technical Strategic Plan

4

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

２．福島第一原子力発電所の廃炉のリスク低減及び安全確保の考え方
2. Concept on risk reduction
and safety assurance for decommissioning of the Fukushima Daiichi NPS

リスク低減の考え方
Concept
on risk reduction➢ The interim goal of the risk reduction strategy is to bring the risk levels into
the “Sufficiently stable management” region (the pale blue area)
Hazard Potential (logarithmic scale)

Small ⇐ Impact of the event ⇒ Large

Technical Strategic Plan 2021
Technical Strategic Plan 2020

※ Major progress shown in red

Safety Management (logarithmic scale)
Small ⇐ Likelihood ⇒ Large
Example of risk levels at the Fukushima Daiichi NPS

5

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

２．福島第一原子力発電所の廃炉のリスク低減及び安全確保の考え方
2. Concept on risk reduction
and safety assurance for decommissioning of the Fukushima Daiichi NPS

主要なリスク源のリスク低減プロセスとその進捗
Risk reduction
process for major risk sources and its progress➢ Risk reduction process for major risk sources and an example of representing thedecommissioning work progress(Visualized transition process of the risk sources from the time of the accident)(a) Risk reduction process
6

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

２．福島第一原子力発電所の廃炉のリスク低減及び安全確保の考え方
2. Concept on risk reduction
and safety assurance for decommissioning of the Fukushima Daiichi NPS

主要なリスク源のリスク低減プロセスとその進捗
Risk reduction
process for major risk sources and its progress➢ Status of transition (in what proportion) to the “Sufficiently stable
management” region for each risk source compared to the beginning of
the accident(b) Number of fuel assemblies of spent fuel(units 1 to 4)(c) Radioactivity of Cs-137 released
at the accident (units 1 to 3)

Fig. Risk reduction process for major risk sources and its progress(example as of March 2021)

7

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

２．福島第一原子力発電所の廃炉のリスク低減及び安全確保の考え方
2. Concept on risk reduction
and safety assurance for decommissioning of the Fukushima Daiichi NPS

安全確保の考え方
Approach to ensuringsafety during decommissioning

Basic policy➢ As for decommissioning of the Fukushima Daiichi NPS containing the reactors
involved in the accident, its peculiarities regarding safety should be fullyrecognized to ensure safety and sufficient attention should be paid to “the safety
perspective” and “the operator’s perspective”.
✓ Safety perspective : Ensuring safety should be the starting point for consideration.
Determining the most appropriate safety measure (ALARP※)✓ Operator’s perspective : Perspectives and judgements from the standpoint of those
who are familiar with the site and perform operations on site

Peculiarities of Fukushima Daiichi NPS
✓
✓
✓
✓
✓

A large amount of radioactive material is in an unsealed state, and in unusual and various(atypical) forms
Barriers for containing radioactive materials are incomplete
Significant uncertainties exist on the state of radioactive materials and containment barriers
Difficulty in accessing the site and installing instrumentation devices to obtain on-site
information
Since the current level of radiation is high and further degradation of containment barriers is
a concern, it is necessary to take measures in consideration of the time axis without
prolonging the decommissioning activities※ Abbreviation of As Low As Reasonably Practicable. This is the principle that the radiological impact must be
as low as reasonably achievable.

8

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
燃料デブリ取り出し3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.1 Fuel debris retrieval

燃料デブリ取り出しに係る主な目標と進捗
燃料デブリ取り出しに係る主な目標と現状
Major targets
and progress for fuel debris retrieval

Major targets➢ As for trial retrieval in unit 2, which is stated in Mid-and-long-term Roadmap as
to be conducted in 2021, the process has been delayed due to the COVID-19
infection. In order to limit the delay to about one year, preparations will bemade for starting retrieval.
➢ With regard to further expansion of fuel debris retrieval, consideration will begiven to the methods including those for containing, transferring, and storing offuel debris, by assessing internal investigations, research and development.
Connection pipe

Progress

Enclosure

Enclosure➢ The arm-type access equipment
has arrived in Japan and startedRobot arm
testing.
➢ Deposit contact investigation and
3D scanning investigation in thepenetration X-6 was conducted.

Penetration X-6

Robot arm

3D scanned image : Deposits in Penetration X-6
To the building

To Pedestal

Deposits
Horizontal deposit condition (in cross-section)at the penetration X-6

Photographed in October 2020

(TEPCO material edited by NDF)

Fig. Investigation result of 3D scanning9

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
燃料デブリ取り出し3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.1 Fuel debris retrieval

試験的取り出しに向けた戦略
燃料デブリ取り出しに係る主な目標と現状
Strategies
for trial retrieval

Strategy

Trial retrieval➢ Although small in scale, the operation in which an opening will be newly
provided to extend the containment barrier outside the PCV, is a fundamental
form of site construction for future retrieval work, since the conventional
containment barrier was located in the closed flange part (convex edge) of thepenetration X-6. This presents an approach that enters a new stage.
From Enclosure, Connecting pipe to Penetration X-6 connecting structure(approx.W3.6xL11.8xH2.1m(max))
Shielding
Isolation room inside Stage
Arm-type access/Retractable Shielding
Airtight Doorinvestigation equipment Measuring
Hatch Isolation room
Instrument Gate Valve
Isolation Valve

InsidePCVInsidePCVClosed flange

EnclosureContainment barrier after expansion(TEPCO material edited by NDF)

Fig. Schematic drawing of isolation chamber
to be installed at penetration X-6：Previous Containment barrier：Containment barrier after expansion

X-6
Connecting
Penetration X-6
PipeConnecting Structure(TEPCO material edited by NDF)

Fig. Schematic drawing of enclosure to penetration X-6

10

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
燃料デブリ取り出し3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.1 Fuel debris retrieval

試験的取り出しに向けた戦略
燃料デブリ取り出しに係る主な目標と現状
Strategies
for trial retrieval➢ While minimizing delays caused by the COVID-19 infection, mockup
testing that takes full account of uncertainties on site is important interms of actual site applicability and ensuring safety.
➢ It is necessary to maintain the backup system on the UK side, while
sharing information and communicating smoothly with the UK engineers
who fabricated the equipment.
Photo : Robot arm and enclosure

Connection pipe

Enclosure

Enclosure

Robot arm

Penetration X-6

Robot arm

Tip part of fuel debris retrieval device(TEPCO material edited by NDF)
<Wire brush type> <Vacuum vessel type>Fig. Conceptual image of fuel debris retrieval system
11

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
燃料デブリ取り出し3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.1 Fuel debris retrieval

Strategies取り出し規模の更なる拡大に向けた戦略
for further expansion of fuel debris retrieval

Strategy

Further expansion of the retrieval scale① How to select retrieval methods➢ In selecting the method, it is necessary to use evaluation items such asschedule and resources as indexes for selection while satisfying thetarget of safety level.
➢ In the process of selecting the method, it is most important to quantify
each of these evaluation items, to use what evaluation items as indexes
for selection, and how to set the weighting of these indexes.
➢ In a situation with many uncertainties, it is necessary to proceed withexamination based on the currently available information and then to
feed back the results gained from the investigation.

② Development of retrieval scenarios➢ Several scenarios of fuel debris retrieval by each unit should be
examined and clarified several paths. Then, it is important to narrow
down the pathways thereafter to take according to the information
obtained afterward.
12

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
燃料デブリ取り出し3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.1 Fuel debris retrieval

Strategies取り出し規模の更なる拡大に向けた戦略
for further expansion of fuel debris retrieval③ Clarification of requirements➢ Followings are important because operations, devices and equipment,
and facilities will be larger, and the scope of construction will be wider.
✓ Consideration in overviewing the entire Fukushima Daiichi NPS✓ Specification and optimization of the requirements (containment, criticality,
operability, maintainability, throughput ※, etc.) for operations and devices④ Process for narrowing down
promising retrieval methods➢ Diverse ideas are expected to
be derived, but it is important
to conduct objective
evaluation and to narrow
down the methods by thegradual process.

End of FY2021

Ideas

Candidates

Method A
Method B

Method A

Method C

Method C
Method D

Method D

Method E
Method F

Narrowing down
promising methods(First and second candidates)

Primary screening
Meet therequirements or not

Method E Secondary screening

Method A

Method G

Method C

Method G

Method H

Method H

Method I

Method I

Method K

Quantification andweighting of eachindicator

Method E+G

Method J
Method K※ Fuel debris retrieval capacity that indicatesthe processing time and operational efficiency

Fig. Image diagram of the process fornarrowing down retrieval methods
13

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

３．福島第一原子力発電所の廃炉に向けた技術戦略
３．福島第一原子力発電所の廃炉に向けた技術戦略
3.2
燃料デブリ取り出し廃棄物対策
3. Technological strategies
toward decommissioning of the Fukushima3.1
Daiichi
NPS 3.2 Waste management

燃料デブリ取り出しに係る主な目標と現状
廃棄物対策に係る主な目標と進捗
Major
targets
and progress for solid waste

Major targets➢ As an effort towards implementing processing/disposal, prospectsof a processing/disposal method and technology related to its
safety should be made clear by around FY 2021.

Progress

Providing prospects of a processing/disposal
method and technology related to its safety

a. Present measures toward reducing the volume of solid wasteb. Develop analytical/evaluation method for efficient characterizationc. Develop methods to reasonably select safe processing/disposal
methods at the time when the necessary information such as solid
wastes’ properties are proven14

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.2 廃棄物対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS 3.2 Waste management

固体廃棄物の処理・処分方策とその安全性に関する技術的な見通し
Prospects of a processing/disposal method and technology related to its safety◼ Present measures toward reducing the volume➢ The priorities for measures to be taken as waste management are ①
prevention of waste generation, ② minimization of waste volume, ③ reuse, ④
recycling. In waste management, it is important to consider ⑤ disposal as thelast option for volume reduction of waste.
①: Consider in the design andconstruction plan to reduce thevolume of materials to be used. Not
to bring in substances that affectprocessing/disposal as much as
possible②: Strict segregation③: Reuse should be promoted after
contamination checks,
decontamination, repair and parts
replacement④: Consider the contamination condition,
separate and process recyclable
materials, and use them as new
materials and products

Fig. Summary of waste hierarchy at the NDA, UK, andcountermeasures at the Fukushima Daiichi NPS

15

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.2 廃棄物対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS 3.2 Waste management

固体廃棄物の処理・処分方策とその安全性に関する技術的な見通し
Prospects of a processing/disposal method and technology related to its safety◼ Develop analytical/evaluation method➢ Automation of pretreatment and simplified analytical methods compared to theconventional radioactivity measuring method, etc.
➢ Establishing the method in which statistical methods have been applied to
identify variable distribution and the width (quantify uncertainties in evaluatedvalues).

◼ Develop methods to reasonably select processing/disposal methods➢ For the waste for which properties have been identified to some extent, repeating
examination steps from ① to ③, and an appropriate combination of processing(waste form) and disposal※ methods would be examined,① Establish several feasible disposal methods suitable for waste characteristics.
② Establish several processing methods suitable for waste characteristics to be consideredand set the specifications of waste package after applying each processing method.
③ Evaluate the safety of several selected disposal methods based on the specifications ofwaste form after processing to verify whether risk to the public and environment can be
sufficiently low, and to consider more effective processing/disposal methods based on theevaluation results.
※ The location and scale of the facility are not specified.

16

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.2 廃棄物対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS 3.2 Waste management

固体廃棄物の処理・処分方策とその安全性に関する技術的な見通し
Prospects of a processing/disposal method and technology related to its safety

Fig. Develop methods to reasonably select safe processing/disposal methods
17

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.2 廃棄物対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS 3.2 Waste management

廃棄物対策に係る分野毎の技術戦略
Technical strategy
by sector related to waste management

Strategy

Characterization➢ It is important to develop a medium-to-long-term analysis strategy thatdefines the solid waste to be analyzed, its priority, and quantitative targets
for analysis, etc., and to proceed with analysis/evaluation accordingly.

Storage➢ It is important to reconsider measurement items and timing, etc., while
acquiring necessary information through continuous monitoring andsurveillance of the storage status commensurate with the risks involved.

Processing/disposal➢ In order to establish safe and reasonable processing/disposal methods,
and to widely obtain knowledge for optimizing each individual stream※, it isnecessary to continue development/research of processing/disposal
technologies required for the series of studies.
※ A series of handling procedures for each type of waste, from generation/storage to processing/disposal

18

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.3 汚染水対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS
3.3 Contaminated and treated water management

汚染水対策に係る主な目標と進捗
汚染水対策に係る主な目標と現状
Major targets andprogress for contaminated water management
Major targets➢ To reduce the stagnant water in the reactor buildings in FY 2022 to FY 2024 toabout the half of the amount of the end of 2020, while controlling the generation
amount of the contaminated water to 100 m3/day or less in 2025

Progress➢ Excluding the reactor buildings of units 1 to 3, the process main building andhigh-temperature incinerator building, the treatment of stagnant water inbuildings was completed in 2020.

Fig. Outline of contaminated water management(Source : TEPCO)

19

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.3 汚染水対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS
3.3 Contaminated and treated water management

原子炉建屋滞留水低減に向けた戦略
Reducing stagnant water in reactor buildings

Strategy

Reduction of the stagnant water in the reactor buildings➢ In considering the removal methods for preventing the spread of αnuclides, it is necessary to collect samples from as many places as
possible and to understand the variation in their properties.

Fig. Water treatment systems for stagnant water in buildings and measurement results of total α-nuclides

20

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.3 汚染水対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS
3.3 Contaminated and treated water management

ALPS処理水に係る戦略
Strategies for ALPS-treated water

Major targets➢ ALPS-treated water currently being stored in tanks will be handled inaccordance with the government’s basic policy decided in April 2021.

(TEPCO material edited by NDF)

Fig. Conceptual diagram of ALPS-treated water discharge system planned by TEPCO

21

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.3 汚染水対策
3. Technological strategies ３．福島第一原子力発電所の廃炉に向けた技術戦略
toward decommissioning of the Fukushima Daiichi
NPS
3.3 Contaminated water management

ALPS処理水の海洋放出に向けた取組
Efforts for releasing ALPS-treated water into the sea◼ Issues for discharging ALPS-treated water into the ocean➢ The government’s decision on the policy is in line with internationalguidelines. It is an important decision from the perspective ofensuring the sustainability of decommissioning work.
➢ The discharge system is based on existing domestic andinternational experience, and safe discharge can be achieved
through thoroughly maintaining manuals and strictly following theplan.
➢ In order to ensure the reliable operation of the implementation plan,
it will be necessary to increase the transparency of the plan
execution status, including confirmation and monitoring by third
parties such as the IAEA.

22

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.4 使用済燃料プールからの燃料取り出し
3. Technological ３．福島第一原子力発電所の廃炉に向けた技術戦略
strategies toward decommissioning of the Fukushima
Daiichi NPS
3.4. Fuel removal from spent fuel pools

プール内燃料取り出しに係る主な目標と進捗
プール内燃料取り出しに係る主な目標と現状
Major targets
and progress for fuel removal from spent fuel pools
Major targets➢ Fuel removal from SFPs will start in FY 2027 to FY 2028 for Unit 1 andFY 2024 to FY 2026 for Unit 2. (For Unit 3, completed in February 2021)
Progress

Fig. Storage status of spent fuel (As of March 2021)
23

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

3.4 使用済燃料プールからの燃料取り出し
3. Technological ３．福島第一原子力発電所の廃炉に向けた技術戦略
strategies toward decommissioning of the Fukushima
Daiichi NPS
3.4. Fuel removal from spent fuel pools

プール内燃料取り出しに係る戦略
Strategies for fuel removal from spent fuel pools

Strategy

Overhead craneLarge cover

Unit 1

Fuel handlingmachine➢ It is important to comprehensively
consider removal of overhead craneand how to handle well-plugs, taking
into account the impact on the otheroperations by performing thoroughsafety assessments.

Unit 2

Heavy machineryfor demolition
Opening for
unloading rubble

Crane

Ancillary facilities
Temporaryworking platform

Internal cover

Runway girder(Ventilation and air conditioning, etc.)

N

During rubble removal (Conceptual drawing)

During fuel removal (Conceptual drawing)(TEPCO material edited by NDF)

Fig. Fuel removal method from SFP (Unit 1)➢ For a fuel handling machine to be
introduced as a new system, it isimportant to perform mockup tests
and to be sufficiently familiar withremote operation.
➢ For further dose reduction of theoperating floor, it is important toincorporate new survey results indecontamination and shielding
installation methods .

(TEPCO material edited by NDF)

Fig. Fuel removal method from SFP (Unit 2)24

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

４．廃炉の推進に向けた分析戦略
4. Analysis strategy
for promoting decommissioning◼ Analysis is one of the important factors in considering solid waste andfuel debris with significant uncertainty.
◼ To obtain good analysis results, it is effective to properly maintain (i) the
methods and systems for analysis, (ii) the quality of the analysis results,and (iii) the size and quantity of sample.
✓ It is necessary to organize division ofroles according to the characteristics ofthe of facilities for analysis including the
Ibaraki area.
✓ Securing of analytical engineers anddeveloping human resource areneeded.
✓ It is important to comprehensively
review/evaluate at what stage of theaccident, what elements were mainlycontained, and what properties they
have.
Fig. Three elements of the fuel debris analysis strategy✓ It is effective to diversify and expand
the analysis methods and to perform
comprehensive evaluation.
25

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

５. 研究開発への取組
5. Efforts to facilitate
researchand development
目次◼ Updating the R&D medium-and-long term plan for fuel debris retrieval and others◼ Strengthening of the functions of project planning and management in the Project of Decommissioning andContaminated Water Management. (NDF has been participating in the secretariat)◼ TEPCO’s own R&D activities, and strengthen their structure. (Establishment of Decommissioning
Technology Development Center)◼ Strengthening and accelerating the perspective of the needs in the Nuclear Energy Science & Technology
and Human Resource Development Project (TEPCO joined as the screening member for selection.)Fig. Overview of the R&D structure of the decommissioning of Fukushima Daiichi NPS

26

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

６.技術戦略を支える取組
6.
Activities to support our technical strategy
６.技術戦略を支える取組

プロジェクト管理に係る取組
プロジェクト管理に係る取組
Projectmanagement approach◼ Significance and current status of project management➢ For smooth promotion of the decommissioning project, it is necessary to establish
and enhance a management system in which the organizations work together toachieve the goals.
➢ TEPCO has been working to build and strengthen its project management system,and the general framework was established, it is important to rooted in the on-site
operations.

◼ Key issues and strategies to be strengthened in the future➢ Every employee needs educational materials and opportunities to learn about safety
in a systematic way for establishing safety as an organizational culture.
➢ TEPCO needs to improve the owner’s engineering capability✓ Ability to assess and manage process risks✓ Improving acquisition management capability (Acquiring the final outcome (product ordeliverables) by "making things up", in considering everything from development tomanufacturing and operation and maintenance)✓ Promotion of internalization to develop the ability to plan/design, maintain/operatethemselves.

➢ Securing and developing human resources for the smooth implementation of
decommissioning projects✓ Development of the Medium-to-long term human resources development plan and its
systematic implementation27

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

６.技術戦略を支える取組
6.
Activities to support our technical strategy
６.技術戦略を支える取組

国際連携の強化
地域共生 cooperation
国際連携の強化Strengthening
international◼ Significance of international cooperation➢ It is important to learn lessons from precedent overseas decommissioning activities,
and to utilize the world's highest level of technology and human resources.
➢ It is important to secure the confidence of the international community by
disseminating accurate information on the decommissioning, and to promote
decommissioning in a mutually beneficial manner by actively returning to theinternational community the knowledge, etc., gained through the accident.

◼ Key issues and strategies➢ It is necessary to continue this mutually
beneficial relationship while also working toreturn the results to the interna community.
➢ It is important to continue to build and strengthen
relationships by utilizing online systems andother means so that international cooperation will
not be diluted.
➢ For the steady implementation of
decommissioning, it is necessary to disseminate
accurate information that meets the interests of
the recipients through various opportunities.

Fig. Annual meeting of NDF with foreignorganizations concerned(held online in April 2021)

28

無断複製・転載禁止 原子力損害賠償・廃炉等支援機構©Nuclear Damage Compensation and Decommissioning Facilitation Corporation

６.技術戦略を支える取組
6.
Activities to support our technical strategy
６.技術戦略を支える取組

地域共生
地域共生
Local community
engagement◼ Current status of initiatives for regional industrial and economic infrastructure➢ The fundamental principle for the decommissioning of the Fukushima Daiichi NPS
is "coexistence of reconstruction and decommissioning”. Revitalization of
decommissioning-related industries is an important pillar of TEPCO's contribution
to the reconstruction of Fukushima.
➢ Efforts for the accumulation of decommissioning industries based on TEPCO’s“Commitment” published at the end of March, 2020.
①②③

Matching support with prime
Increased participation of local enterprises
contractors
Survey of the needs regarding
Support for local enterprises to step up
human resource development
Creation of new local industries → Building an integrated decommissioning project
implementation system in the Hamadori region※◼ Key issues and strategies➢ With the understanding of prime contractors, it is necessary to implement orderingand contracting methods that will make it easier for local companies to receive
orders on a trial basis.
➢ Further strengthening of cooperation and collaboration with local governments,and local related organizations, including the Fukushima Innovation Coast
Framework and the Fukushima Soso Recovery Promotion Organization, which areoperating a joint consultation service and co-hosting matching business meetings.
※ TEPCO, “ The recruitment of factory operation partners and Cask license partners for the establishment of a factory fordecommissioning-related products in Hamadori Region of Fukushima Prefecture”,
announced on
July 9, 2021
無断複製・転載禁止
原子力損害賠償・廃炉等支援機構

29©Nuclear Damage Compensation and Decommissioning Facilitation Corporation