Design and commissioning of condensate polishing system of AP1000 unit

The design life of AP1000 nuclear power plant is 60 years, it has higher requirements for the quality of secondary loop water. In order to ensure the water quality and enhance the inherent safety of the system, Haiyang nuclear power plant adopts valveless bypass to improve the safety of the condensate polishing system, and post filters are added, recycling facilities are improved, recycling process is optimized to control the generation of sulfate, and to prevent corrosion of stainless steel steam generator. The commissioning of Haiyang NPP adopted the Westinghouse Subcontracting mode, and some experiences feedback during the commissioning was noted. (authors)