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Research on Seismic PSA for NPPs   SUN Feng1, 2, and LI Xiaoming1, 2   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001，China (smlink260@126.com) 2. China Nuclear Power Engineering, Beijing 100840, China   Abstract: More and more attention has been paid to Seismic PSA (Probabilistic Safety Assessment) in nuclear power plant especially after Fukushima accident in March 2011. However, new method for Seismic PSA should be developed since the equipment failure probability is largely the function of PGA (peak ground acceleration) which is given by a probabilistic density curve. One useful method to deal with the conditional probability is to divide the seismic hazard curve into several intervals.  In this paper the analysis frame for seismic PSA is first introduced. Based on this analysis procedure, we obtain the consequence by the fault trees and event trees modeling and fragility input. Finally, by using the two assumptions, PGA intervals and ceiling factor are compared. The obtained results and insights are sensitive and significant to the CDF (core damage frequency). However, the seismic risk of the plant below SSE is relatively low,where the contribution of the interval between 0.3g and 0.45g has the most significant effect. Keywords: Seismic PSA; PGA; conditional probability; seismic hazard curve
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