Seismic performance of nuclear power equipment is one of the important indexes measuring its safety and reliability analysis system. In this paper

the seismic performance of a wedge-shaped double-gate for nuclear power plant is analyzed. First of all

the seismic analysis method

namely the equivalent static method

is determined by analyzing the basic frequency of the valve based on ANSYS platform. Secondly

based on the adopted method

the stress analysis of the valve under working condition load

seismic load and its own gravity is carried out

and the equal stress and deformation are obtained. In this process

in order to reduce the superposition error caused by the simple load reaction

the method of taking the comprehensive square root of the vibration modes in all directions is adopted. Finally

according to the ASME stress evaluation code for pressure vessels

the valve components are evaluated along the path of the danger point. The results show that

the stress distribution in the three defined danger paths does not exceed the limit value of the stress that the valve can withstand

which means that the designed method conforms to the design specification and can meet the requirements of working conditions. The analysis results provide a reference for seismic analysis and further structural optimization design of this kind of nuclear first class valves in power stations.