Transient Property Simulating and Dealing of Small-Break Loss-of-Coolant Accident in Nuclear Power Plant

： Nuclear power plant operation analysis code is designed and developed,on the base of nonhomogeneous and nonequilibrium model for the two- phase flow,by solving a fast partially implicit numerical scheme.,and is used to analyze transient property of a small- break loss- of- coolant accident in nuclear power unit.Method to deal the accident are proposed.