Study on Categorization of Components Based on Binary Importance Decision

There are some problems for the current probabilistic component categorization in terms of the selection and the calculation of the importance measures,and the confirmation of the categorization threshold.The combination of binary importance decision,the additivity transferring model and the risk evaluation standard based on the aftermath can solve the problems.The binary importance categorization decision is validated to be reasonable based on the probabilistic safety analysis model for Qinshan phase II nuclear power station.