Spent Fuel Management in Japan. Central Research Institute of Electric Power Industry. Masumi WATARU. INMM 32 st Spent Fuel Seminar January.

Transcription

1 Spent Fuel Management in Japan Central Research Institute of Electric Power Industry Masumi WATARU INMM 32 st Spent Fuel Seminar January. 11, Contents 1.Current Situation of Interim Storage in Japan 2.Studies on the Interim Dry Storage 3.Summary

2 Political Situation Cabinet Approval of the New Basic Energy Plan (April. 11, 2014) Nuclear power will be positioned as an important base load power source and the nuclear fuel cycle will continue to be promoted. Discussion of the share of nuclear power generation. The government will lead the efforts for final disposal of high-level radioactive waste. The repository site selection process Open solicitation of municipalities New approach led by the government Political Situation Establishment of Nuclear Reprocessing Organization of Japan (NuRO) (Oct. 2016) Ref: Decision of Decommissioning of Monjyu (Dec. 2016) Ref:

3 Political Situation The government announced the action plan of the measures for Spent Nuclear Fuel. Establishing a council between the government and electric power companies Requesting electric power companies to draw up a plan to deal with spent nuclear fuel measures Strengthening regional measures for spent nuclear fuel (i.e Grant system) Enhancing public understanding on measures for spent nuclear fuel Electric power companies will draw up a plan to deal with spent nuclear fuel measures in response to a request by the Government. The first council was held on Nov. 20, The electric power companies announced the measures for spent nuclear fuel. Aiming to secure additional capacity of approximately 6000tU (4000 tu by 2020 through currently planned measures and another 2000 tu by 2030) ( icsfiles/afieldfile/2015/11/27/press_e_ pdf) NRA recommended to promote the dry storage of spent nuclear fuel Spent Fuel Storage of Electric Power Companies Electric Power Companies NPP Percent of Spent Fuel Stock (%)(*1) Hokkaido E.P. Co. Tomari 59 Tohoku E.P. Co. Onagawa 84 Higashidori 50 Fukushima-Daiichi 94 Tokyo E. P. Co. Fukushima-Daini 82 Kashiwazaki-Kariwa 100 Chubu E. P. Co. Hamaoka 90 Hokuriku E. P. Co. Shika 51 Mihama 72 Kansai E. P. Co. Takahama 90 Ohi 92 Chugoku E. P. Co. Shimane 79 Shikoku E. P. Co. Ikata 85 Kyushu E. P. Co. Genkai 76 Sendai 84 The Japan Atomic Power Co. Tsuruga 82 Tokai-Daini 96 *1: (Spent Fuel Stock)/(Control Capacity) 100 Estimated value are obtained as the sum of the stock as of the end of September 2015 and four-cycles worth (four refuelings worth)of spent fuels. Note: There are many assumptions. Please refer to original document. icsfiles/afieldfile/2015/11/27/press_e_ pdf

4 Operational Status Mutsu Takahama Sendai Ikata Under Re-design Situation of Nuclear Power Plants Restart of Nuclear Power Plants Sendai No.1 (Planned Outage) Sendai No.2 Takahama No.3 *1 Takahama No.4 *1 Ikata No.3 *1: A court ordered these plants to shut down. Nuclear Power Plants obtained the permission from NRA Mihama No.3 *2 Takahama No.1 *2 Takahama No.2 *2 *2:These plants obtained a license extension up to 60 years. *:No BWR obtains the permission. Kinki and Kyoto Universities obtained the permission of restart of research reactors from NRA

5 Decommissioning Operational Status (Decommissioning and Life Extension) Life Extension &2 Unit 3 Mutsu &2 & Decommissioning Plants Hamaoka No.1 and ~2014: Preparation 2015~2022: Decommissioning of surrounding facilities of Reactor Vessel 2023~2029: Decommissioning of Reactor Vessel 2030~2036: Decommissioning of Buildings Tsuruga No ~2024: Preparation 2025~2033: Decommissioning of Reactor Vessel, spent fuel pool, etc. 2034~2039: Decommissioning of Buildings Mihama No.1 and ~2021: Preparation 2022~2035: Decommissioning of surrounding facilities of Reactor Vessel 2036~2041: Decommissioning of Reactor Vessel 2042~2045: Decommissioning of Buildings Shimane No ~2021: Preparation 2022~2029: Decommissioning of surrounding facilities of Reactor Vessel 2030~2037: Decommissioning of Reactor Vessel 2038~2045: Decommissioning of Buildings Genkai No ~2021: Preparation 2022~2029: Decommissioning of surrounding facilities of Reactor Vessel 2030~2036: Decommissioning of Reactor Vessel 2037~2043: Decommissioning of Buildings Ikata No.1 ~2026: Preparation 2027~2041: Decommissioning of surrounding facilities of Reactor Vessel 2042~2049: Decommissioning of Reactor Vessel 2050~2056: Decommissioning of Buildings Spent Fuels in the pool will be transfer to the pool of the other unit in the same site

6 Contents 1.Current Situation of Interim Storage in Japan 2.Studies on the Interim Dry Storage 3.Summary Studies on the Interim Dry Storage in CRIEPI Ageing effect of aluminum alloy for the basket Canister Metal Gasket Three Factors of Stress Corrosion Cracking (SCC) Long Term Seal Performance of Metal Gasket Crack Metal Cask Concrete Cask Evaluation and Countermeasure for SCC of the Canister

7 Studies on the Interim Dry Storage in CRIEPI Research for Metal Cask Seal Performance of Metal Gasket Long term sealability performance tests with metal gasket enveloped by aluminum Researches for Concrete Cask Evaluation on the SCC of the Canister SCC initiation tests using test specimens with heater in the constant temperature and humidity chamber SCC initiation tests using test specimens applied by water jet peening Development of LIBS technology for measurement of salt deposition on the canister surface Research for both Casks Evaluation on the ageing effects of aluminum alloy for the basket Research done by Japanese Utilities Demonstration test program for long-term dry storage of PWR spent fuel has not started yet Summary After restart of the NPPs, the Japanese Electric Power Companies will face the issue of Spent Nuclear Fuel Management. The Japanese government released Action Plan on Measures for the spent nuclear fuel. The Japanese Electric Power Companies will draw up a plan to deal with spent nuclear fuel measures. CRIEPI is continuing the studies on the following issues of dry storage technologies. Metal Cask: Long term Seal Performance Concrete Cask: SCC of the Canister Both: Ageing Management