Based on the design and operation experience of nuclear power unit at home and abroad

the technology and economic benefits of condensate polishing system for nuclear power station with pressurized water reactor(PWR) under various conditions were analyzed

and the design principle of this system was presented.It showed that

the condensate polishing system should meet the requirements of purifying the condensate water when the unit started and the cooling water leaked out.This system should not be operated when the unit ran normally.If using seawater as the cooling water

the polishing system should be set up with full flow.While when using fresh water as the cooling water

the capacity of this polishing system should be determined by comprehensive calculation considering relative factors such as salt content of the cooling water

allowable value of the condenser leakage

quality control standard of water in the secondary circuit

and the discharge capacity of the steam generator.The polishing system should adopt cation-mixed bed.