The Development of Safety Function Capability Analysis Methodology to Enhance Defense-In-Depth

摘要

GE-Hitachi Nuclear Energy (GEH) has developed a framework called Safety Function Capability Analysis (SFCA). The purpose of the SFCA is to demonstrate that the proposed or existing nuclear reactor design meets the regulations of interest by using a systematic process of identifying the safety systems that fulfill the safety Junctions for different postulated initiating events and the postulated accidents and design extension conditions with the required Defense-In-Depth (DID) levels of protection. The SFCA methodology has been applied to ESBWR for a proposed new reactor project. This methodology has also been applied to an existing BWR plant for similar regulation requirements at the TVO site. Different options of the proposed plant modifications have then been evaluated to demonstrate the adequacy of meeting the safety function capability requirements. The plant-specific DID levels have been evaluated with the SFCA methods to either identify potential vulnerabilities or to demonstrate safety enhancements associated with the proposed plant modifications.