核电站重要厂用水系统常见腐蚀行为分析及治理建议

Analysis and Management Advice of Common Corrosion Behavior for Essential Service Water System in Nuclear Power Plant

核电站重要厂用水系统腐蚀问题直接影响系统完整性和可靠性,威胁电站运行安全。为了控制和避免腐蚀问题,总结分析了内部防腐层、不锈钢材料2个方面的失效案例。结果显示,防腐层失效的主要原因为施工和安装不合理及自然老化导致,不锈钢结构件失效主要为材质选型、结构设计和材质加工工艺不当。针对以上失效问题,提出从现场施工质量控制和后期维护管理2个方面开展工作以控制防腐层失效,通过选材换型、结构改进和材料检验来治理和预防不锈钢部件腐蚀缺陷,可为国内核电站重要厂用水系统的腐蚀管理工作提供参考。

The corrosion problems of essential service water system in nuclear power plant directly affect the system integrity and availability,thus threatening the safety operation power of plant.In order to control and avoid corrosion problems,in this paper,two aspects of the failure cases about internal anti⁃corrosive layer and the stainless steel material were summarized and analyzed.Results showed that the main reasons for the failure of the anti⁃corrosive layer were unreasonable construction and installation,natural aging.The main reasons for the failure of stainless steel structural components were improper material selection,structural design,and material processing technology.In response to the above failure issues,it was proposed to carry out work from two aspects:on⁃site construction quality control and post maintenance management to control the failure of anti⁃corrosive layer.Through material selection and replacement,structural improvement,and material inspection,cor⁃rosion defects of stainless steel components could be treated and prevented,which could provide reference for the corrosion management of es⁃sential service water systems in domestic nuclear power plants.