理化检验-物理分册2026，Vol.62Issue(8)：10-15,6.DOI:10.11973/lhjy-wl260179
核电厂阀盖泄漏原因
Causes of valve cover leakage in nuclear power plants
辛虹阳 1张伟 1余飞扬 1雷阳 1郑霄 1滕常青 1谷昊2
作者信息
- 1. 中国核动力研究设计院第一研究所,成都 610000
- 2. 辽宁红沿河核电有限公司,大连 116000
- 折叠
摘要
Abstract
A leakage incident occurred at the isolation valve cover of a nuclear power unit's sampling system.The causes of the valve cover leakage were analyzed using macroscopic observation,penetrant testing,chemical composition analysis,mechanical property testing,scanning electron microscopy and energy spectrum analysis,and metallographic examination.The results show that there were two axial cracks on the inner surface of the valve cover,as well as circumferentially distributed microcracks of varying lengths at the root of the valve cover diameter transition area.Mechanical processing altered the stress state of the valve cover's inner surface,leading to the rupture of the passive film under high-temperature and high-pressure water conditions,which accelerated crack initiation and propagation,ultimately resulting in stress corrosion cracking of the valve cover.关键词
阀盖/泄漏/变径区域/应力腐蚀开裂/显微组织Key words
valve cover/leakage/diameter transition area/stress corrosion cracking/microstructure分类
通用工业技术引用本文复制引用
辛虹阳,张伟,余飞扬,雷阳,郑霄,滕常青,谷昊..核电厂阀盖泄漏原因[J].理化检验-物理分册,2026,62(8):10-15,6.
