误用四氯乙烯清洗剂对手动阀和密封组件应力腐蚀风险分析  

Stress Corrosion Cracking Analysis for Manual Valves and Seal Assemblies Wrongly Degreased with Tetrachloroethylene

作　　者：张平 黄炳臣[2] 冉小兵 戴长年 刘言午 张明乾 

机构地区：[1]中广核工程有限公司,广东深圳518124 [2]环境保护部核与辐射安全中心,北京100082

出　　处：《核动力工程》2014年第6期176-179,共4页Nuclear Power Engineering

摘　　要：某核电机组堆芯测量系统(RIC)手动阀和密封组件被误用四氯乙烯进行清洗。而该部件为奥氏体不锈钢,由于四氯乙烯热解过程中会导致氯离子Clˉ的产生,存在Clˉ致应力腐蚀风险。通过分析手动阀和密封组件的残留Clˉ含量、运行温度以及冷却剂中的氧含量,认为残留的Clˉ含量不会导致手动阀和密封组件在服役过程中发生应力腐蚀。RIC manual valves and seal assemblies made of austenitic stainless steel were wrongly degreased with tetrachloroethylene by the manufacturer. Chloride ions （Cl^-） were produced during the pyrolysis of tetrachloroethylene, leading to the risk of stress corrosion cracking （SCC） due to the remaining Cl^-. The research shows that the Cr-Ni austenitic stainless steel becomes more sensitive to the stress corrosion cracking as the Cl^-content increases. Increasing temperature and oxygen （0） content can accelerate the SCC of austenitic stainless steel caused by Cl^-. After the analysis of the remaining Cl^- content in the manual valves and seal assemblies, operating temperature and oxygen content in the coolant, it is considered that the remaining Cl^- will not cause SCC during service of manual valves and seal assemblies. In addition, the pyrolysis of tetrachloroethylene under vacuum and abrasive blasting of surfaces can decrease Cl^- observably.

关 键 词：手动阀和密封组件 奥氏体不锈钢 氯离子(Clˉ) 应力腐蚀开裂(SCC) 

分 类 号：TL341[核科学技术—核技术及应用]