核电站阀门密封唇焊泄漏原因分析研究及改进建议  

Cause Analysis and Research on Leakage of Valve Seal Lip Welding in Nuclear Power Plant and Improvement Suggestions

作　　者：柳猛 邓江勇 汤恒 何燃 LIU Meng;DENG Jiangyong;TANG Heng;HE Ran(China Nuclear Power Engineering Co.,Ltd,Shenzhen of Guangdong Prov.518124,China;Guangxi Fangchenggang Nuclear Power Co.,Ltd,Fangchenggang of Guangxi Prov.538000,China;South China Nuclear and Radiation Safety Supervision Station,Ministry of Ecology and Environment.,Shenzhen of Guangdong Prov.518026,China)

机构地区：[1]中广核工程有限公司,广东深圳518124 [2]广西防城港核电有限公司,广西防城港538000 [3]生态环境部华南核与辐射安全监督站,广东深圳518026

出　　处：《核科学与工程》2023年第6期1312-1321,共10页Nuclear Science and Engineering

摘　　要：针对核电站辅助给水系统(ASG)、主给水流量控制系统(ARE)、主蒸汽系统(VVP)等多个系统的截止阀唇焊结构发生泄漏的问题,通过结构特点、材料特性、焊接性、焊接工艺、性能试验及仿真计算等方面,开展阀门唇焊泄漏的原因分析研究。结果表明,在外部载荷的作用下,唇焊焊缝从根部不连续启裂,沿着不合格的淬硬组织开裂,直至贯穿失效,焊缝中的淬硬组织是阀门唇焊的主要原因。避免阀门唇焊泄漏的改进建议主要有消除淬硬组织、改变淬硬组织、消除和改变淬硬组织结合的方法。Aiming at the leakage problem of valve lip welding structure of ASG,ARE,VVP and other systems in nuclear power plant,the cause analysis of valve seal lip welding leakage was carried out through the research of its structural characteristics,material characteristics,weldability,welding technology,capability test and simulation calculation.The results show that under the action of external load,the lip welding Weld starts from the discontinuous crack at the root,cracks along the unqualified hardened structure,and finally fails through.The hardened structure in the Weld is the main reason for valve leakage.The improvement suggestions to avoid lip welding leakage mainly include eliminating hardened microstructure,changing hardened microstructure,and combining eliminating and changing hardened micro structure.

关 键 词：核级阀门 唇焊缺陷 原因分析 改进建议 

分 类 号：TL48[核科学技术—核技术及应用]