SAFETY ANALYSIS ON AP1000 CONTAINMENT COOLING SYSTEM RESPONSE UNDER LBLOCA CONDITIONS

摘要

Large Break Loss of coolant Accident (LBLOCA) is one of the design basis accidents (DBAs) of nuclear power plant safety. DBAs may cause containment failure due to the impact of high temperature or high pressure resulted from the LB LOCAs. In this study, the passive cooling mechanism of AP1000 containment will be investigated, The performance of the passive containment cooling system (PCCS) is evaluated, and the decay heat removal capability for the long-term cooling is also evaluated in this study. Passive containment cooling system utilizes gravity driven natural convection and natural induced passive safety device to remove decay heat of fuels to the environmental atmosphere.