Decommissioning Science Diagram
Preparation
mainly for basic and fundamental R&D（Detailed Version） Outline of Decommissioning Workflow

Pursuit of basic and fundamental research will lead to solution of issues
Applied and practical research and development will lead to the solution of issues

ActionDesignBasic and Fundamental Research will lead to accumulation of knowledge
Basic and Fundamental Research may lead to knowledge acquisition in the future

Overall Strategy to Rationally Proceed with Decommissioning（Entire process optimization, Risk management, Economic rationality）
Fuel Debris Retrieval

Understanding conditions
inside reactor vessel

Understanding status of fuel debris（FDR-101）

Understanding status of structures inside PCV and RPV （FDR-102）

Understanding doses inside PCV andRPV（FDR-104）

Understanding status of FP（FDR-103）

Sorting fuel debris

Improving work
environment

Sorting fuel debris and radioactive
waste（FDR-201）

Shielding and decontamination
measures（FDR-202）

Confinement ofradioactive material

Exposure control of workers
inside buildings（FDR-203）

Establishingconfinement
function（FDR-205）

Structural integrity

Fuel debris retrieval
policy（FDR-213）

Establishing debris
collection strategy

Establishing and operatingcomprehensive risk
management measures

Ensuring integrity ofsystem equipment andarea（FDR-212）

Emergency
response（FDR-216）（FDR-214）（FDR-215）（FDR-206）

Retrieval method and system

Understanding status offuels for maintaining
stable conditions（FDR-208）

Criticality
control

Strategy and risk

Ensuring structural
integrity of PCV andbuildings（FDR-211）

Criticality Prevention/Cool/Hydrogen（maintaining stable conditions)（FDR-207）

Understanding contamination
status inside buildings（FDR-106）

Collection of knowledge on conditions
inside reactor vessel（FDR-105）

Site boundary doseassessment（FDR-204）

Measuresagainst dust

Understanding conditions
inside building

Maintaining
cooling function

Understanding hydrogengeneration behavior（FDR-209）（FDR-210）

Establishing access route tofuel debris（FDR-217）

Developing fuel debris retrieval
equipment and devices（FDR-218）

Ensuring safety in processing
fuel debris（FDR-219）

Establishing closed loop
（FDR-220）

Retrieval
Fuel debris retrieval insidePCV（FDR-301）

Understanding
current status

Confinement ofradioactive material

Understanding
current statusof SFP（SFP-101）

Understanding andpreventing emission
and leakage（SFP-201）

Structural integrity
Understanding structuralintegrity of PCV andbuildings, etc.（DRB-201）

RemovalSF removal

Dismantling
Removing in-core
structures anddismantlingbuildings（DRB-301）

Waste

Contaminated Water Management

Water
treatment

Groundwater/
contaminated water
management/reduction
Underground andbuildings water level
control（CWM-201）

Understanding
current status ofunderground andbuildings （CWM-102）

Ensuring structuralintegrity（CWM-202）＆Management

Efficient andeffective water
treatment（CWM-302）

Environment
remediation
Site decontamination anddose rate reduction (PDR-303)

Waste package qualification

Characterization（TSR-101）(PDR-101)

Waste strategy(PDR-102)

Materialaccountancy(PDR-103)

Waste strategy（TSR-102）

Material accountancy（TSR-103）

Maintaining stable conditions

Characterization

Verification and analysis method
on waste package(PDR-205)

Technology development to assess andmanage storage container integrity（TSR-201）
Understanding hydrogengeneration behavior（TSR-202）
Design of canister
specifications（TSR-204）

Criticality control（TSR-205）

Transport・storing・storage

Environmental dynamics

Switchover to uncontrolledareas(PDR-304)

Fundamental
Research ofTechnology102）

Transport/Storing/Storage

Characteri
zation2

Establishing disposal
concept(PDR-203)
Performanceassessment(PDR-204)

Understanding
properties andvolume ofobjects to bedismantled（DRB-Characterization 1

Waste conditioning
method(PDR-202)

Disposal technology
according to disposalconcept(PDR-302)

Developing dismantlingscenario and sorting
strategy（DRB-203）(including Wastes containing Alpha Nuclides originating from Fuels)

Reuse and volumereduction(PDR-201)

Disposal concept（DRB-101）

Dismantling scenario

Decontamination and dose
rate reduction（DRB-205）

Waste reduction andconditioning

DisposalEstablishing sorting criteria
by alpha, beta and gamma
contamination（DRB-202）

Decontamination

Measuring alphaand difficult-tomeasure nuclides(including Wastes containing Alpha Nuclides originating from Fuels)

Waste volume reduction
by clearance(PDR-301)

Assessingconditions
inside reactorand buildings(fordismantling)

Establishing worksequence（DRB-204）（CWM-301）

Processing/Disposal/Environment Remediation

Clearance

Understanding
current status

Waste sorting criteria（SFP-301）

Ensuring structuralintegrity（SFP-202）

Understanding
current status ofcontamination
source（CWM-101）

Continuously maintaining andensuring safety function（FDR-303）

Dismantling PCV/RPV/Buildings

Fuel Removal from SFP

Understanding
current statusFuel debris retrieval inside
RPV（FDR-302）

Transport/storing/storage
method investigation（TSR-301）

Impact assessment onsurroundingenvironment(PDR-206)

Remote controltechnology(BST-1)
Standardization(BST-5)

Visualizationtechnology(BST-2)

Measurement andanalysis technology(BST-3)

Risk assessment(BST-6)

Radiation
resistance(BST-4)

Knowledge management(BST-7)

Fundamental Research of Society〇Legislation 〇HR development〇Coexistence with local community〇Dispatch of information 〇Ensuring sustainability〇Working environment management

Please note that this English text is a provisional translation of the Japanese original.

Decommissioning Science Diagram
Preparation
mainly for basic and fundamental R&D（Detailed Version） Outline of Decommissioning Workflow

ActionDesignOverall Strategy to Rationally Proceed with Decommissioning（Entire process optimization, Risk management, Economic rationality）
Fuel Debris Retrieval

Understanding conditions
inside reactor vessel

Understanding status of fuel debris（FDR-101）

Understanding status of structures inside PCV and RPV （FDR-102）

Understanding doses inside PCV andRPV（FDR-104）

Understanding status of FP（FDR-103）

Sorting fuel debris

Improving work
environment

Sorting fuel debris and radioactivewaste（FDR-201）

Shielding and decontamination
measures（FDR-202）

Confinement ofradioactive material

Exposure control of workers
inside buildings（FDR-203）

Establishingconfinement
function（FDR-205）

Structural integrity

Fuel debris retrieval
policy（FDR-213）

Establishing debris
collection strategy

Establishing and operating
comprehensive risk
management measures

Ensuring integrity ofsystem equipment andarea（FDR-212）

Emergency
response（FDR-216）（FDR-214）（FDR-215）（FDR-206）

Retrieval method and system

Understanding status offuels for maintaining
stable conditions（FDR-208）

Criticality
control

Strategy and risk

Ensuring structuralintegrity of PCV andbuildings（FDR-211）

Criticality Prevention/Cool/Hydrogen（maintaining stable conditions)（FDR-207）

Understanding contamination
status inside buildings（FDR-106）

Collection of knowledge on conditions
inside reactor vessel（FDR-105）

Site boundary doseassessment（FDR-204）

Measuresagainst dust

Understanding conditions
inside building

Maintaining
cooling function

Understanding hydrogengeneration behavior（FDR-209）（FDR-210）

Establishing access route tofuel debris（FDR-217）

Developing fuel debris retrieval
equipment and devices（FDR-218）

Ensuring safety in processing
fuel debris（FDR-219）

Establishing closed loop（FDR-220）

Retrieval
Fuel debris retrieval insidePCV（FDR-301）

Understanding
current status

Confinement ofradioactive material

Understanding
current statusof SFP（SFP-101）

Understanding andpreventing emission
and leakage（SFP-201）

Structural integrity
Understanding structural
integrity of PCV andbuildings, etc.（DRB-201）

RemovalSF removal

Dismantling
Removing in-core
structures anddismantlingbuildings（DRB-301）

Waste

Contaminated Water Management

Water
treatment

Groundwater/
contaminated water
management/reduction
Underground andbuildings water levelcontrol（CWM-201）

Understanding
current status ofunderground andbuildings （CWM-102）

Ensuring structuralintegrity（CWM-202）＆Management

Efficient andeffective watertreatment（CWM-302）

Environment
remediation
Site decontamination anddose rate reduction (PDR-303)

Waste package qualification

Characterization（TSR-101）(PDR-101)

Waste strategy(PDR-102)

Materialaccountancy(PDR-103)

Waste strategy（TSR-102）

Material accountancy（TSR-103）

Maintaining stable conditions

Characterization

Verification and analysis method
on waste package(PDR-205)

Technology development to assess andmanage storage container integrity（TSR-201）
Understanding hydrogengeneration behavior（TSR-202）
Design of canister
specifications（TSR-204）

Criticality control（TSR-205）

Transport・storing・storage

Environmental dynamics

Switchover to uncontrolledareas(PDR-304)

Fundamental
Research ofTechnology102）

Transport/Storing/Storage

Characteri
zation2

Establishing disposal
concept(PDR-203)
Performanceassessment(PDR-204)

Understanding
properties andvolume ofobjects to bedismantled（DRB-Characterization 1

Waste conditioning
method(PDR-202)

Disposal technology
according to disposal
concept(PDR-302)

Developing dismantlingscenario and sorting
strategy（DRB-203）(including Wastes containing Alpha Nuclides originating from Fuels)

Reuse and volumereduction(PDR-201)

Disposal concept（DRB-101）

Dismantling scenario

Decontamination and dose
rate reduction（DRB-205）

Waste reduction andconditioning

DisposalEstablishing sorting criteria
by alpha, beta and gamma
contamination（DRB-202）

Decontamination

Measuring alphaand difficult-tomeasure nuclides(including Wastes containing Alpha Nuclides originating from Fuels)

Waste volume reduction
by clearance(PDR-301)

Assessingconditions
inside reactorand buildings(fordismantling)

Establishing work
sequence（DRB-204）（CWM-301）

Processing/Disposal/Environment Remediation

Clearance

Understanding
current statusWaste sorting criteria（SFP-301）

Ensuring structuralintegrity（SFP-202）

Understanding
current status ofcontamination
source（CWM-101）

Continuously maintaining andensuring safety function（FDR-303）

Dismantling PCV/RPV/Buildings

Fuel Removal from SFP

Understanding
current status

Fuel debris retrieval inside
RPV（FDR-302）

Transport/storing/storage
method investigation（TSR-301）

Impact assessment onsurrounding
environment(PDR-206)

Remote control
technology(BST-1)
Standardization(BST-5)

Visualization
technology(BST-2)

Measurement andanalysis technology(BST-3)

Risk assessment(BST-6)

Radiation
resistance(BST-4)

Knowledge management(BST-7)

Fundamental Research of Society〇Legislation 〇HR development〇Coexistence with local community〇Dispatch of information 〇Ensuring sustainability〇Working environment management

Please note that this English text is a provisional translation of the Japanese original.