Corrosion and Protection of Secondary Circuit Circulating Cooling Water Pump in TNPS

The corrosion forms of OB2-185E circulating cooling pump in Tianwan Nuclear Power Station (TNPS) are introduced. The reasons of corrosion are analyzed from the aspects of structure, material-selection, working environment etc. The corresponding protection measures are proposed. The practice shows that all components are in good condition through 8 months of operation after treatment measures were adopted, no further corrosion phenomenon is found.