[2K07-13] Resilience of Nuclear Structures

[2K10] Development of failure mitigation technologies for improving resilience of nuclear structures

(8)Effectiveness evaluation technology of the measures for improving resilience against excessive earthquake

*Hiroyuki Nishino¹, Yuichi Onoda¹, Kenichi Kurisaka¹, Hidemasa Yamano¹, Kazuyuki Demachi² (1. JAEA, 2. UTokyo)

Keywords:measures for improving resilience, excessive earthquake, loss of heat removal systems after reactor shutdown, accident sequences, core damage frequency

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.