RISK-INFORMED CATEGORIZATION OF THE SSCs IN NPPs

摘要

The categorization and treatment of Structures, Systems and Components (SSCs) is a very important partof the license base for Nuclear Power Plants (NPPs). The over-conservativeness of some regulationrequirements concerning the categorization and treatment of SSCs based on current deterministic categorizationhas been recognized by both the nuclear industry and the regulatory body gradually. Therefore, NRC hasreleased the new section 50.69 "Risk-Informed Treatment of Structures, Systems and Components" to amendTitle 10 of the Code of Federal Regulations (10 CFR). The pilot study of the risk-informed categorization ofSSCs, which is based on the systems in Daya Bay NPP including the survey of methods and the analysis ofsamples, is presented in this paper.