Abstract: The categorization of Structures, Systems and Components (SSC) is one of the cornerstones in the design of the nuclear power plant. The regulation requirements based on the current deterministic categorization are over-conservative in some aspects, and on the contrary, some other requirements are too loose. In order to make the requirements reasonable, the risk-informed categorization of SSCs has been presented. USNRC and some owners affirm that this categorization method is available. Therefore, related requirements, standards and guidelines have been established by USNRC, and on the other hand, some pilot studies have been made by those owners. In this paper, we summarized the background, methods and pilot studies related to this categorization. The relationship and difference between the two methods: exiting deterministic one and the risk-informed one are compared, and the methodology about risk-informed categorization is illuminated. In this way, we expect that the readers have an ...更多overview about the current status about risk-informed categorization and bring forward some prospects about its development.overview about the current status about risk-informed categorization and bring forward some prospects about its development
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Received: 13 August 2009
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