Simulation of MSLB+SBO Nuclear Accident Drill Sequence of 3rd-Generation Passive Nuclear Power Plant Based on Severe Accident Simulator

The full scope simulator (FSS) is very important for operator training, but the related SA training can’t be conducted for lack of the severe accident models, so it is urgent to expand the severe accident model on the FSS in nuclear power plant (NPP). The full scope simulator of 3rd-generation passive NPP can perform more abundant and complete accident scenes for operator training and accident drills through coupling MAAP5 models, namely severe accident simulator (SA simulator). In this paper, the severe models (such as core, primary system, containment), the key technologies of coupling MAAP5 software with FSS are described. Then taking the MSLB+SBO as the initial hypothetical condition to simulate the whole process of the severe accident emergency drill scenario in 3rd-generation NPP and make a preliminary sensitivity analysis on the mitigation effect of the mitigation measure for RCS injection flow in the accident drill scenario. The results show that the whole severe accident drill process can be very simulated, the SA simulator can not only provide an effective mean for the simulation of NPP severe accident drill scenarios, but also can be used as an auxiliary tool for the verification of severe accident management guidelines (SAMG) and the optimization of drill scenarios in NPP, which provide some technical support for the safe and stable operation of nuclear power plant.