Research on the Application of STPA Method in Reliability Analysis of Safety Spray Control in NPP

In order to ensure the safe and stable operation of nuclear power plant (NPP), the safety reliability analysis is necessary. The safe spray control system is an important engineered safety features system which is use in the accident about containment over-temperature, over-pressure. The article gives an research on the system theoretic process analysis (STPA) methods for the reliability analysis of the safety spray control system function. It helps to find out the potential factors effect for the safety function of the spray control and provides some suggestion to improve the system reliability and the station safety operation. This is the good experience and new demonstration for the STPA application and is benefit to the following project practice in NPP.