Application of Probabilistic Safety Assessment in the Risk Analysis and Management of Interface Systems LOCA in a Nuclear Power Plant

Interfacing systems LOCA is a kind of special loss of coolant accident in nuclear power plants, which has an important impact on the nuclear power plants safety. Because the break of this kind of accident is located outside the containment, the interfacing systems LOCA will cause a large amount of radioactivity to be directly released from the core to the atmospheric environment without the detention of the containment, so which is an important contribution to the large early release of nuclear power plants. The Probabilistic safety assessment have been applied to a nuclear power plant in Chinese mainland in this paper. The risk of interfacing systems LOCA in the nuclear power plant is comprehensively evaluated from the occurrence scenarios and frequency of initial events, accident mitigation strategy and event tree modeling, accident consequence and impact analysis. Through the application of probabilistic safety assessment, the key factors that may lead to a core damage and large release of the interface LOCA in the nuclear power plant has been find out, and the weakness existing in the power plant in dealing with such accidents has been discussed at the same time. According to the results of the analysis, how can the nuclear power plant deal with such accidents much more better is discussed, the improve suggestions are given.