核电厂闭式冷却水系统阀门及管道内壁腐蚀瘤问题分析

Analysis of Tuberclesin Valves and Pipelines of the Closed Cooling Water System in Nuclear Power Plant

某核电厂闭式冷却水系统多数阀门及管道内壁附着腐蚀瘤,经比较分析推断由垢下腐蚀所致,且这些腐蚀瘤为局部电化学腐蚀引起的非微生物腐蚀瘤。通过明确腐蚀瘤下的腐蚀机理断定溶解氧浓度是控制腐蚀瘤生长的最重要因素,进而提出为消除垢下腐蚀需最小化水中氧含量并阻止结垢形成。

There were tubercles in most of valves and pipelines of the Closed Cooling Water system in a nuclear power plant.Through comparative analysis, it was concluded that the tubercleswere caused by under-deposit corrosion.And these tubercles were non-biological ones caused by local electrochemical corrosion. It is concluded that the dissolved oxygen concentration was the most important factor to control the growth of thetubercles by understanding tubercles’corrosion mechanism. Furthermore, in order to eliminate the corrosionunder the scale, it was necessary to minimize the oxygen content in the water and prevent the formation of fouling.