PSA study of the effect of extreme snowfall on a floating nuclear power plant:case study in the Bohai Sea  

作　　者：Lan‑Xin Gong Qing‑Zhu Liang Chang‑Hong Peng 

机构地区：[1]School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China

出　　处：《Nuclear Science and Techniques》2023年第11期212-225,共14页核技术（英文）

摘　　要：This study presents a probabilistic safety analysis(PSA)method for the external event of extreme snowfall on a floating nuclear power plant(FNPP)deployed in the Bohai Sea.We utilized the Weibull and Gumbel extreme value distributions to fit the collected meteorological data and obtained a hazard curve for the event of an extreme snowfall where the FNPP is located,providing a basis for the frequency of extreme snowfall-initiating events.Our analysis indicates that extreme snowfall primarily affects the ventilation openings of the equipment,leading to the failure of devices such as the diesel generators.Additionally,extreme snowfall can result in a loss of off-site power(LOOP).Therefore,the developed extreme snowfall PSA model is mainly based on the LOOP event tree,considering responses such as snowfall removal by personnel.Our calculations indicate a core damage frequency(CDF)of 1.13×10^(-10) owing to extreme snowfall,which is relatively low.The results of the cut-set analysis indicate that valve failures in the core makeup tank(CMT),passive residual heat removal system(PRS),and in-containment refueling water storage tank(IRWST)significantly contribute to the CDF.

关 键 词：Floating nuclear power plant(FNPP) ACP100 Extreme snow PSA External hazard 

分 类 号：TM623[电气工程—电力系统及自动化]