User’s Manual of SECOM2-DQFM: A Computer Code for Seismic System Reliability Analysis

This is the English translation of the Japanese version of the user’s manual of SECOM2-DQFM, which is developed for seismic reliability analysis of complex engineering systems, such as nuclear power plants. Given that the seismic hazard curve of the location site of a plant and the fault tree / event tree (FT/ET) models of this plant were known, if the capacities and responses of components were available, the conditional occurrence probability (or frequency) of the top event of the FT models could be estimated with SECOM2-DQFM. In addition, the importance of each basic event as well as the occurrence frequency of each accident sequence could also be obtained.In order to evaluate the concurrent failure probability of multiple components due to earthquake, the method of Direct Quantification of Fault Tree using Monte Carlo simulation (DQFM) is adopted in SECOM2-DQFM. In this method, the capacity and response of each component are generated from their probability distributions. Then the capacities (as well as responses) of several components are made correlated following a given set of correlation rules. As a user manual of SECOM2-DQFM, this report is organized as follows. Chapter