The design of nuclear power equipment is concerned with structural integrity and stability of the equipment in running process. Using the finite element analysis software

the stress calculation and seismic analysis were carried out on the fram structure of the air-cooled chiller unit in a nuclear power station. The calculation results show that the structure strength and bolts strength of the air-cooled chiller can meet the requirements of all working conditions. Finally some suggestions for the design of unit frame were put forward

which could provide reference for the optimization design and seismic performance improvement of air-cooled chiller in nuclear power plant in the future.