Risk Assessment of Test Cycle Change of Important Equipment in Nuclear Power Plant

Probabilistic safety analysis (PSA) has become the main method in the world to quantitatively calculate the reactor risk increment when the nuclear power plant equipment is not available and to support the nuclear power plant in making risk decisions. When analyzing the periodic test data of the hydro test pump diesel generator system (LLS001AP) in a domestic nuclear power plant, it is found that the number of start-up failures of the hydro test pump diesel generator set is significantly increased compared with the previous one. To cooperate with the maintenance profession to find out the cause of the fault, the nuclear power plant needs to increase the frequency of the periodic test of the hydro test pump diesel generator system. In this paper, probability safety analysis technology is used to analyze and judge whether the frequency of periodic tests of the hydro test pump diesel generator system can be increased. Ensure safe and stable operation of the nuclear reactor after changing the frequency of periodic tests.