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,8; 過大地震時のレジリエンス向上策の有効性評価技術

Development of failure mitigation technologies for improving resilience of nuclear structures, 8; Effectiveness evaluation technology of the measures for improving resilience against excessive earthquake

西野 裕之  ; 小野田 雄一 ; 栗坂 健一 ; 山野 秀将   ; 出町 和之*

Nishino, Hiroyuki; Onoda, Yuichi; Kurisaka, Kenichi; Yamano, Hidemasa; Demachi, Kazuyuki*

過大地震時のレジリエンス向上策の有効性評価のため、炉停止後の除熱機能喪失事象(LOHRS)を対象とし、その事象を防止する対策として耐震裕度の向上などのレジリエンス向上策を想定し、炉心損傷頻度を計算した。レジリエンス向上策の導入前後の炉心損傷頻度の比較から低減効果を見積った。

In order to evaluate the effectiveness of the measures for improving resilience against excessive earthquake, this study assumed to improve seismic safety margin of components of heat removal system as the measures against loss of heat removal systems event after reactor shutdown. The core damage frequency was calculated and the reduction effect of it was estimated by comparing it before and after the introduction of the measures for improving resilience.