Current status of Fukushima Daiichi NPS Efforts for Decommissioning and Contaminated Water Management

Transcription

1 Current status of Fukushima Daiichi NPS Efforts for Decommissioning and Contaminated Water Management Agency for Natural Resources and Energy, METI March, 2018

2 Mid- and Long- term Roadmap Framework (provisional translation)- Mid-and-Long-Term Roadmap The government has formulated Mid-and-Long-Term Roadmap towards the Decommissioning of TEPCO s Fukushima Daiichi Nuclear Power Station and is engaged in process control measures for decommissioning. It has been revised three times so far. Continuous review will be carried out based on the situation of the site in the future and the results of research and development. Major Milestones of the Mid- and Long-Term Roadmap Contaminated water management Stagnant water treatment Removal of spent fuels Retrieval of fuel debris Solid Radioactive waste Suppress contaminated water generation to about 150 m 3 / day. Within 2020 Storage of all water generated by treatmentof highly contaminated water in welded-joint tanks 1Separation of connection between Units 1 and 2 and between Units 3 and 4 2Reduction of radioactive materials in stagnant water in the buildings by one-tenth of the 2014 year-end. FY 2018 Within 2018 FY Completion of treatment of stagnant water in buildings Within Start of spent fuel removal at Unit 1 2Start of spent fuel removal at Unit 2 3Start of spent fuel removal at Unit 3 1Decision on the method for fuel debris retrieval from the 1st implementing Unit FY 2023 (an outlook) FY 2023 (an outlook) Mid FY2018 FY Start of fuel debris retrieval from the 1 st implementing Unit Within 2021 Establishment of a technical perspective on measures of treatment / disposal and on safety. Around FY2021

3 Key event Investigation using Robots Unit1 Unit2 Unit3

4 95% Key numbers

5 Key numbers Under 0.7Bq/L (Bq/L) WHO s guideline level for drinking water quality I-131 Cs-134 Cs-137 Generation of contaminated water m 3 /day m 3 /day

6 Unit 4 Mar Now

7 Unit 3 Mar Now

8 Robot into Unit 2 (30 Jan. 2017) 調査用パイプ ( Guide 先端にカメラ pipe ) Robot s route ロボット経路 Scaffold fallen 7

9 Camera into Unit 2 (19 Jan. 2018) CRD housing support Pebbly deposits (Estimated as fuel debris) Direction: the access opening for workers

10 Robot into Unit 1(18-22 Mar. 2017) A dosimeter & A camera in water

11 Robot into Unit 3 (19-22 Jul. 2017) Inside the pedestal

12 Contaminated Water Management Waterproof pavement Tank Groundwater level Upper Permeable layer 難透水層 下部透水層 Treated and stored in tanks Groundwater bypass 揚水井 Pump up Sub-drain Pump up Treated and used for cooling Reactor bldg. Turbine bldg. Sub-drain Pump up Ground solidification by sodium silicate Pump 汲み上げup Sea 海水面 level Low-Permeable layer 難透水層 (Source: TEPCO s website) Land-side 5 陸側遮水壁 impermeable frozen walls Land-side 5 陸側遮水壁 impermeable frozen walls Well point ウェルポイント Groundwater 地下水ドレン drain 8 海側遮水壁 Sea-side impermeable walls

13 Bird s-eye view Flow of groundwater

14 Contaminated Water Management N Impermeable Wall 13

15 Mountains Frozen-soil Walls Cross-section Sea.+35m Pump up Reactor Bldg. Groundwater bypass Sub-drain 原子炉タービン Sub-drain 建屋建屋 Pump up Pump up Groundwaterdrain Pump up Layers of earth Impermeable Wall Frozen-soil Walls

16 Freezing condition of the entire frozen wall (as of 9 February 2017) 地下水ドレン Sea-side impermeable wall Temperature(degree) Frozen soil wall (Seaside) Frozen soil wall (Sea-side) The temperature of the temperature measuring tube at a position 85 cm away from the frozen line Groundwater flow 地下水の流れ Maintenance operation range 15

17 Status of generation of contaminated water Generation of contaminated water Generation of Contaminated water m 3 /day Operation of the groundwater bypass started. Rainfall at FD Generation of Contaminated water Approx. 500 Operation of the sub-drains started. Closure of the seaside impermeable wall Operation of the groundwater drains started. Closure of the frozen wall on the land side started. Closure of the frozen wall on the seaside. Approx Rainfall at FD

18 Waterproof Pavement Before After

19 Status of seawater monitoring around outside of the port Status of seawater (Bq/L) Seawater at north side of Discharge Channel of Unit 5,6 (Bq/L) Seawater around the south Discharge Channel WHO s guideline level for Drinking water quality Cs134,Cs137:10Bq/L I-131 Cs-134 Cs WHO s guideline level for Drinking water quality Cs134,Cs137:10Bq/L I-131 Cs-134 Cs

20 Working Conditions <Large rest house> < Changes in rest areas > Just after the accident From May 2015

21 Mid-and-Long-Term Roadmap June, 2011 Adapted June, 2015 Revision of third edition Many countermeasures have progressed. ex) Robot investigation inside the PCVs The policy for fuel debris retrieval has been decided based on NDF s technical strategic plan. September, 2017 Revision of fourth edition

22 Mid-and-Long-Term Roadmap (1)Fuel debris retrieval Step by step approach (2) Spent fuel removal from pools Proceed carefully with work Key points (Provisional translation) (3) Contaminated water management Reduction of generation volume of contaminated water (4) Solid Waste management Storage of solid waste with volume reduction under the safety conditions (5) Communication Reinforce interactive communication

23 Points of Revision fourth edition Mid-and-Long-Term Roadmap The current framework is maintained.

24 Releasing information from Gov. Local National Overseas Portal site of the status of Decommissioning and Contaminated water Management management in METI-WEB Films in Japanese Brochures in Japanese A Film in English Brochures in English Monthly Information To Fukushima Pre. And 13 local municipalities Monthly Press Briefing To local media Release Information To Industries Monthly Press Briefing To media Provision of updates to IAEA Release Information through; Japanese Embassies and ministerial-level conversations, Embassies in Tokyo, Press Conference, Briefing, Tour, etc.

25 Fukushima Advisory Board on Decommissioning and Contaminated Water Management Members Main Topics Chair:State Minister of METI Members : Deputy Governor of Fukushima Prefecture, Mayors of 13 local municipalities around site Chamber of commerce, Agricultural cooperative, Fishery association, NPO TEPCO, METI, Nuclear Regulation Authority, etc. The 1 st Meeting in Feb. 2014: Explanation of current status (Main issues: Contaminated water Management) from TEPCO & Gov. The 12 th Meeting in Mar. 2017: Discussion around members related to best efforts such as contents of information transmission (decommissioning and contaminated water management) Films, Brochures International Forum

26 Film and Brochure Fukushima Today -For a Bright Future-(English) Release: Sep Runtime: 5 min. Subtitle: English, Chinese, Korean Fukushima Today 2017 Spring (Japanese) Release: Mar Runtime: 17 min. *for the domestic audience Friends of Japan Fukushima (English) Release: Jun Runtime: 13 min. *Mainly off-site Fukushima Today (English) Important Stories on Decommissioning Brochure Release: Jan Runtime: 90 sec. *Aired on JAL, ANA international flights, in hotels, airports etc.

27 Film (Digest)

28 International Organizations Cooperation with International Communities Cooperation with International Communities Peer Review Missions (April, ) Expert Visits Expert Meetings Comprehensive information on the website (December, ) The Fukushima Daiichi Accident (September, 2015) (Reported by the Director General) Side Event in the General Conference ( ) BSAF Project (Benchmark Study of the Accident at the Fukushima Daiichi NPS) PreADES (Preparatory Study for Analysis of Fuel Debris) EGFWMD Meeting (The Expert Group on Fukushima Waste Management and Decommissioning R&D) Bilateral Frameworks U.S.-Japan Bilateral Commission on Civil Nuclear Cooperation - Decommissioning and Environmental Management Working Group - Civil Nuclear Energy R&D Working Group UK-Japan Nuclear Dialogue - Decommissioning Working Group Japan-France Nuclear Committee Japan-Russia Nuclear Energy Working Group

29 The Import restrictions on fishery products from Japan As of May 2011 As of January 2018

30 International Forum on the Decommissioning of the Fukushima Daiichi Nuclear Power Station The 1 st Forum 10,11 April 2016 in Iwaki-city Main speakers: At the 2 nd Forum Dialogue between local representatives and METI, NDF, TEPCO, IAEA, OECD/NEA, etc. W. D. Magwood IV Director General, OECD/NEA J. C. Lentijo Deputy Director General, IAEA M. Weightman Former Chief Executive, ONR The 2 nd Forum 2,3 July 2017 in Hirono-town and Iwaki-city Facilitator / Main Speakers Simultaneous graphic recording of the discussion H. Kainuma Associate Professor, RITS Univ. W. D. Magwood IV Director General, OECD/NEA J. C. Lentijo Deputy Director General, IAEA The 3 rd Forum 5,6 August 2018 in Naraha-town and Iwaki-city 29