DEVELOPMENT OF COMPACT RISK LEVEL CUT SETS FOR OPERATIONAL SAFETY ASSESSMENTS

摘要

The development of cut sets for releases and for risks can be a useful product of Level 2 and 3 probabilistic safety assessments (PSAs), allowing for the analysis of systems and components on a risk oriented basis. This paper describes a technique for developing such cut sets. The development is first done for a Level 2 probabilistic risk assessment (PRA)/PSA and then the extension to include Level 3 is indicated [1]. The Level 1 PSA is assumed here to produce plant damage cut sets, which include the relevant containment systems. By construction, each path or sequence of events through the containment event tree (CET) leads to a unique end point and this path can be described as a unique set of CET event outcomes, e.g. {A_1A_2A_3...A_m}_t, where the subscript t refers to the particular outcomes of the events that define the path.