原子炉構造レジリエンスを向上させる破損の拡大抑制技術の開発,11; 次世代原子炉のレジリエンス向上策

Development of failure mitigation technologies for improving resilience of nuclear structures, 11; Analysis for enhancing resilience of next-generation nuclear power plants

二神 敏  ; 安藤 勝訓 ; 山野 秀将   

Futagami, Satoshi; Ando, Masanori; Yamano, Hidemasa

次世代原子炉のレジリエンス向上策の検討のため、炉停止直後に崩壊熱除去系全系統が機能喪失する除熱系喪失事象(PLOHS)を対象として、耐震振れ止めの下部支持構造を有する原子炉構造を例に3次元構造解析の予備解析を実施し、原子炉容器とガードベッセルの超高温時の変形挙動を把握した。

To enhance resilience of next-generation nuclear power plants, the authors have performed a three-dimensional analysis of structures with an earthquake-resistant lower support structure, assuming a protected loss of heat sink event, which may cause all decay heat removal systems to lose their functions immediately after reactor shutdown. The results show how the reactor vessel and guard vessel deform at extremely high temperatures.