Demonstration SFR conceptual design project in Japan, 1; Plan and status

二神 敏; 市川 健太*; 持田 晴夫*; 黒目 和也*; 後藤 正治; 江沼 康弘

Proceedings of International Conference on Fast Reactors and Related Fuel Cycles (FR26) (Internet), 6 Pages, 2026/05

5-year programs of the demonstration sodium-cooled fast reactor (SFR) conceptual design project in Japan have been conducted from 2024. This project includes 2 stage-gates. The 1st stage-gate is fuel technology specification in 2026. The 2nd stage-gate is the decision to move to basic design phase in 2028. The selected design concept of demonstration SFR was a medium-sized pool-type SFR. The basic plant specifications were established as the initial design concept. The electric power scale was set at 600MW, allowing for flexible deployment to both larger and smaller reactors. To concreate the design of the demonstration reactor, design options are also selected. Key issues of the design options are innovative seismic isolation technology (3-dementinal seismic isolation technology or horizontal seismic isolation), innovative containment vessel technology (steel-plate reinforced concrete structure containment vessel or steel containment vessel) and spent fuel storage technology (in-vessel storage or ex-vessel storage). The paper includes the plan and status of the demonstration SFR conceptual design project in Japan.