Importance of Innovation for D&D at Fukushima Daiichi NPS

Transcription

1 Importance of Innovation for D&D at Fukushima Daiichi NPS March 5, 2014 Kazuhiro Suzuki International Research Institute for Nuclear Decommissioning 無断複製 転載禁止技術研究組合国際廃炉研究開発機構 International Research Institute for Nuclear Decommissioning

2 Covering Structure Spent Fuel Pool (SFP) Primary Containment Vessel (PCV) Reactor Pressure Vessel (RPV) Fuel Debris Vent Contaminated Water Overview of Units 1-4 Unit 1 Unit 2 Unit 3 Unit 4 Water Injection Reactor Building Blow-out Panel (now closed) Water Injection gantry Water Injection Crawler Crane Covering Structure Fuel Removal Cover Started removing fuels 352/1533 Assy. Electrical output 460MW 784MW 784MW 784MW Date of commercial operation 1971/3 1974/7 1976/3 1978/10 WM'14 - session 84 International Research Institute for Nuclear Decommissioning 2

3 R&D Activities of IRID R&D activities to be carried out in order to meet severe conditions of reactor buildings at Fukushima Daiichi. High dose rate High temp. High humidity Rubble Elevated places Underwater Narrow places Injection of sea water R&D for fuel removed from spent fuel pools Spent fuel pool Steam Dryer DS pit Steam Separator Equipment Hatch Debris Reactor pressure vessel R&D for preparation for fuel debris removal R&D for treatment and disposal of R/W Primary containment vessel Torus room WM'14 - session 84 International Research Institute for Nuclear Decommissioning 3

4 Major Challenges for Fukushima Decommissioning R/B Damage Water Boundary Fuel Debris Location Bottom of Vessel Fukushima Daiichi NPS Damaged by H 2 explosion (Units 1, 3 and 4) Both RPV/PCV damaged (Units 1-3) Possibly fallen out from RPV Complex structure with control rod drives Limited TMI-2 RPV remained intact Remained in RPV No structure WM'14 - session 84 International Research Institute for Nuclear Decommissioning 4

5 High Dose Rate inside Reactor Building WM'14 - session 84 5

6 Development of Fuel Debris Retrieval Technology Ongoing approach Innovative approach (a) (b) 5F 4F 3F 2F 1F (c) Underground (d) (a) from Top side under water (b) from Top side in atmospheric condition (c) from lateral side in atmospheric condition (d) from bottom side in atmospheric condition WM'14 - session 84 International Research Institute for Nuclear Decommissioning 6

7 RFI for Fuel-Debris Retrieval Purpose of the RFI is to solicit information from industry, academia, and government-affiliated agencies on issues related to design of innovative approaches to fuel debris retrieval. RFI is not a funding opportunity. Responses to RFI will be used only for planning additional R&D programs. Preceding conceptual study (C/S) and technology feasibility study (F/S) will be initiated from spring/summer of 2014, subject to governmental /Japan s Diet direction in regard to budgeting and approval. In addition, intention of RFI is to initiative and encourage collaboration and alliances. WM'14 - session 84 7

8 R&D program on Fuel Debris Retrieval [ by IRID] WM'14 - session 84 8

9 Phased Approach Phase 1: RFI for conceptual study (C/S) & feasibility study (F/S) <Project Workshop> Planned in Spring 2014 Objectives Share latest updates of decommissioning activities of Fukushima Daiichi NPS and relevant R&D outcomes. Discuss next steps based upon responses to the RFI. Encourage collaborations/alliances among respondents. Phase 2: RFP and Implementation of C/S & F/S <Project Workshop> Phase 3: RFP and Implementation of R&D program WM'14 - session 84 9

10 Program Structure WM'14 - session 84 10

11 Status of Information Collection from RFI WM'14 - session 84 11

12 Spent Fuel and Radioactive Waste Safely Stored on Site Spent fuel Radioactive waste WM'14 - session 84 International Research Institute for Nuclear Decommissioning 12

13 Waste Storage Volume Site map as of end of September 2013 Key Waste Contaminated / Treated water(water storage tanks) Secondary waste from contaminated water treatment Miscellaneous waste Felled trees Contaminated soil Storage Volume 500,000 m vessels 71,000 m 3 71,000 m 3 Under evaluation Unit 6 Unit 5 Unit 1 Unit 2 Unit 3 Unit 4 Contaminated / Treated water, Secondary waste as of 21 January 2014 Miscellaneous waste, Felled trees as of 30 November 2013 WM'14 - session 84 Photo by JAPAN SPACE IMAGING International CORPORATION, Research Institute Digital for Globe Nuclear at March Decommissioning 12,