酸化物燃料ナトリウム冷却高速炉のシビアアクシデントに係る研究,1; プロジェクト全体概要及び令和7年度までの進捗

山野 秀将; 松場 賢一; 佐々 京平*; 木下 円機*; 守田 幸路*; 齊藤 泰司*; 伊藤 啓*; 鈴木 徹*

第30回動力・エネルギー技術シンポジウム講演論文集(インターネット), 5 Pages, 2026/06

A research project on severe accidents of oxide-fueled core has been started since 2024 as research and development in a conceptual design stage of demonstration sodium-cooled fast reactors in Japan. It is necessary to develop analytical methodologies and technical bases to confirm the effectiveness of various design measures, which are introduced to the demonstration reactor in order to achieve recriticality elimination and in-vessel retention. The project implements element testing, integral testing, analytical methodology development and reactor application analyses, in which involved are important phenomena of fuel discharge behavior, core residual fuel coolability, and debris-bed formation behavior and coolability. This paper describes the project overview and progress until 2025.