[3G09-12] Seismic Evaluation

[3G11] Evaluation of Seismic Diversity of SSC system in PRA

Part2: Proposal of risk assessment method of SSC system considering seismic diversity

*Katayama Yoshifumi¹, Yasuki Ohtori², Toshiaki Sakai³, Muta Hitoshi² (1. Chuden Engineering Consultants, 2. TCU, 3. CRIEPI)

Keywords:seismic diversity, seismic PRA, fragility curve, response spectrum, seismic isolation

In the previous study, we focused on the natural period of the device and the response spectrum characteristics of the seismic motion, and proposed a method for calculating the annual damage frequency of the seismic diversity system composed of seismic designed device and seismic isolated device. In addition, the effectiveness of the seismic diversity system was quantitatively shown by comparing the annual damage frequency of the seismic diversity system and the multiplicity system composed of the single type of devices. In this study, in order to reflect these results in the risk assessment of the entire nuclear power plant, we proposed a framework to consider the seismic diversity system as one device and to evaluate its fragility curve.