Corrosion Behavior of Structural Materials in the Closed Cooling Water System of a Nuclear Power Plant

The Closed Cooling Water (CCW) piping consists of carbon steel in many CCW systems. Carbon steel is subject to corrosion unless protected. CCW can have a falling-off in quality of the system by corrosion, microbial growth, fouling To prevent corrosion, we must accurately evaluate influence of an inhibitor in CCW system. In the case of CCW of some domestic nuclear power plants, during overhaul period, saturation of ion exchange resin caused by an inhibitor which has high conductivity for an increase in radiation exposure and radioactive waste. In most cases, carbon steel corrosion control in CCW systems is achieved by adding corrosion inhibitor chemicals. In nuclear plants, these inhibitors have included chromates, nitrites, molybdates, hydrazine, and silicate. The objective of this study is to evaluate the corrosion behavior of structural materials according to corrosion inhibitor