Operational Availability Simulation for Primary Loop of Marine Nuclear Power Plants

The availability of marine nuclear power plants( MNPP) primary loop system is a persistently concerned problem. It can’t describe the actual situation of using with the usual solution consisting three using situations: normal,maintaining and standby because the primary loop system is complex maintainable and it is a common local structure that more than one series structures are mixed in the parallel branch.Considering 6 working conditions,based on the thought judgment system of minimal path sets,the MonteCarlo numerical simulation method was combined to overcome the disadvantages of conventional analytical method. Taking the primary circuit system of nuclear power plant for example,the various availability indexes were obtained. The simulation method is widely applicable and the simulation results can be used to provide the reference for equipment operation and management.