基于传统PSA方法学 (适用于功率运行工况 )及核电站停堆工况特征 ,提出了一套停堆PSA特征方法 ,包括电站运行状态离散法 ,分阶段评价法和主逻辑故障树评价。将该方法应用于大亚湾核电站 (GNPP)停堆工况PSA研究 ,得到了较真实反映GNPP实际情况的结果。研究结果对GNPP的停堆运行和管理有实际应用价值 ,对我国今后核电站设计、运行及管理也有现实意义 Based on the traditional PSA methodologies (for power operating conditions) and the shutdown conditions of nuclear power plants, a set of shutdown PSA characteristics methods are proposed, including the discrete method of power plant operation status, the phased evaluation method and the evaluation of the main logic fault tree. Applying this method to the study of PSA at shutdown of Daya Bay Nuclear Power Station (GNPP), the result of the actual situation of GNPP was obtained. The research results have practical application value for shutdown and management of GNPP and have practical significance for the design, operation and management of NPP in our country