Outcome of the Japan Power Demonstration Reactor Decommissioning Project Satoshi Yanagihara 柳原敏 Research Institute of Nuclear Engineering University of Fukui 2019 Sino-Japanese Workshop on NPP Decommissioning Technology October 29-30, 2019 @ Atomic Energy Council 3F 1 JPDR拆除實地試驗的成果— 輻射調查、拆除工法與廢棄物處理
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Outcome of the Japan Power Demonstration Reactor ... · Radioactive inventory estimation 4. Dismantling techniques and systems 5. Decommissioning waste treatment, storage and disposal
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Outcome of the Japan Power Demonstration Reactor Decommissioning Project
Satoshi Yanagihara柳原敏
Research Institute of Nuclear EngineeringUniversity of Fukui
2019 Sino-Japanese Workshop on NPP Decommissioning TechnologyOctober 29-30, 2019 @ Atomic Energy Council 3F
1
JPDR拆除實地試驗的成果— 輻射調查、拆除工法與廢棄物處理
Contents
⚫Outline of the Japan Power Demonstration Reactor decommissioning project
⚫ Dismantling activities: remote / hands-on / building demolition
⚫ Project management data
⚫ Study on project planning and evaluation
⚫Outcome of the project
2
Plant Characteristics
⚫ Reactor type & power : BWR, 45/90 MWt
⚫ Facility operation period : 1963-1976
⚫ Total output power : 21,500 MWD
Objectives⚫ to gain actual experience of nuclear power plant dismantling⚫ to verify the developed techniques in actual dismantling activities⚫ to collect data on JPDR dismantling activities
Dismantling Project Overview
⚫ Project period : Dec. 1986 - Mar. 1996
⚫ Project cost : 23 billion yens (including R&D)
⚫ Waste arising : 3,770 tons (Radioactive)
⚫ Worker dose : 306 person-mSv
The JPDR Decommissioning Program
The first experience of dismantling reactor facility in Japan.
Plasma arc cutting is a thermal cutting method in which arc andplasma gas heat are produced by electrical current between arcnode and object to be cut. By-product treatment is necessary forworker safety and proper waste management.
20
Unit Productivity Factors
Dismantling & packaging activities
⚫ Hands-on dismantling : related to component type and weight
⚫ Remote dismantling : related to machine capability
⚫ Decontamination & Radiation measurement : Related to area size
⚫ Demolition of structures : related to structure weight
Preparation & cleaning activities
⚫ No specific relationship to manpower need except work conditions
21
Unit Productivity Factors of Hands-on Dismantling Activities
3.2
13.2
14.9
17.2
19.7
26.3
26.9
27.3
29.6
35.0
38.9
62.7
63.0
85.6
98.1
5.1
22.5
0.5
4.9
7.4
21.7
21.8
49.1
57.3
115.7
0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0
Transformer power supply panelPump
Wall & baseSmall machinery
Control panelHeat exchanger
Air conditionerTank
DemineralizerPiping & valve
Base hungerDuct
Cable & conduitCleaning of sludgeThermal insulation
Control blasting (outer layer)Control blasting (inner layer)
Building structureCrane
Steel wall of reactor enclosureTurbine generatorDump condenser
Turbine condenserUpper & lower part of RPV
Fuel pool liner
man-hours/ton
Facility components
Large components
Relationship between manpower expenditure and components weight
Weight of components being dismantled (tons)
Ma
np
ow
er
ne
ed
s (
ma
n-h
ou
rs)
0 50 100 150
2,000
4,000
6,000
8,000
0
:Preparation
:Dismantling & packaging
:Post-dismantling restoration
▲●■
Data Collection and Analysis
22
Construction using wall or existing pipes
Typical size (3×4m)
Covering a large component
Level 1
2
3
4
5
30~50m2 of work area
Narrow work area less than 30m2,
partially covering of work area
Large work area more than 50m2
Larger than typical size, durable or
multiple or more than single
Same criteria as above
man-hours0 20 40 60 80 100
Level 1
Level 2
Level 2
Level 2
Level 3
Level 3
Level 3
Level 4
Level 4
Level 4
Level 5
Level 5
Level 5
Level 1
Level 1
Remove of
greenhouse
Greenhouse
preparation
Cover of floor and
wall by sheet
Level 1
2
3
4
5
Leve l -5
Man-hours
(standard case)
Survey of work area
Selection of components
Carrying-in of material
Power cut
Scaffolding
Equipment preparation
Cover of floor and wall by sheet
Greenhouse preparation
Remove of greenhouse
Remove of scaffolding
Carrying-out of material
Transfer of equipment
Remove of sheet
5
7
10
10
10
16
23
24
10
10
14
14
28
0 5 10 15 20 25 30
Preparation
Cleanup
A
B
C
A B C
Unit Productivity Factors of Preparation and Post-Cleanup Activities
23
Lessons Learned: Major Consideration For Future Decommissioning Projects
Systematical Consideration For Decommissioning Project⚫ Necessity of total decommissioning plan including waste management and
technology transfer program.⚫ Planning of effective use of land or buildings after dismantling completion.
Record Keeping and Data Collection⚫ Use of any records on dismantling activities and waste management. ⚫ Analysis of project management data such as manpower expenditure,
waste arising and costs.⚫ Application and keeping of lessons learned in various aspects.
Review of Regulatory Systems for New Application or Reformation ⚫ Safety evaluation, waste management systems.⚫ Adequate inspection systems.
24
Major Outcome of JPDR Dismantling Project
⚫ Completion of nuclear reactor decommissioning safely using suitable dismantling techniques and health physics practices
⚫ Verification of the guideline on securing dismantling activities prepared by Atomic Safety Commission
⚫ Demonstration of dismantling technology and characterization
⚫ Establishment of build demolition procedures (from building surface decontamination, survey of radioactivity to demolition)
⚫ Accumulation of project data and experience on dismantlement and waste treatment/disposal.