理化检验-物理分册2026，Vol.62Issue(8)：35-40,6.DOI:10.11973/lhjy-wl260180
核电厂主回路系统阀门泄漏原因
Reasons for valve leakage in the main circuit system of nuclear power plants
谷昊 1辛虹阳 2李燕3
作者信息
- 1. 辽宁红沿河核电有限公司,大连 116000
- 2. 中国核动力研究设计院第一研究所,成都 610000
- 3. 苏州热工研究院有限公司,苏州 215004
- 折叠
摘要
Abstract
A leakage accident occurred in the main circuit system valve of a nuclear power unit.The causes of the valve leakage were analyzed using macroscopic observation,radiographic testing,chemical composition analysis,mechanical property testing,metallographic examination,scanning electron microscopy and energy spectrum analysis.The results show that microcracks and microvoids were present in the mold closing area of the valve body.The Cr and Mn contents inside the cracks were abnormally high,and steps existed at the interface between the base material and weld seam on both sides of the cracks.The crack morphology did not match the characteristics of welding hot cracks,indicated it was an original crack defect formed during the casting manufacturing stage of the valve body.Under the combined action of subsequent welding residual stress and service load stress,the cracks continued to propagate,ultimately leading to valve leakage.关键词
阀门/密封焊缝/裂纹/高温拉伸性能/显微组织Key words
valve/sealing weld/crack/high-temperature tensile property/microstructure分类
通用工业技术引用本文复制引用
谷昊,辛虹阳,李燕..核电厂主回路系统阀门泄漏原因[J].理化检验-物理分册,2026,62(8):35-40,6.
