Abstract: The design features of the condensate polishing system of units in Ling’ao Nuclear Power Station project phase II were summarized. The operation situation of the system after putting into operation successfully was analyzed. The application feedback information was presented. The system has advantages of the rational design, the safe and stable operation and the technology and devices with selfowned intellectual property rights. The defects in previous design and type selection were solved, which provides reference for design of condensate polishing system in subsequent nuclear power stations.

Key words: condensate polishing system, WANO (World Association of Nuclear Operators) chemical index, columnar ion exchange equipment with large diameter, ‘Finesep’ high-tower separating method