Failure Analysis and Countermeasures Discussion of a Cracked Leak off Tube in Primary Heat Transport and Heavy Water Collection System

摘要：

　　Chemical composition analysis, microstructure analysis, macro and micro fracture morphology analysis were conducted on a cracked leak off tube in primary heat transport and heavy water collection system of TQNPC.The results show that the material conforms to the original design requirements.The leaked fluid vaporized at the penetration and stress corrosion crack initiated because of cl-concentration.The leaked fluid drains periodically and lead the wall surface temperature periodically changes.The SCC crack transformed to corrosion fatigue crack and the tube fmally fractured.In order to prevent the similar tubes crack again, preventive maintenance strategies were given in this paper.

关键词： nuclear power plants failure analysis concentration stress corrosion crack corrosion fatigue

作者: Liang Zhao Kunjie Luo GuangFu Li Rong Wan

作者单位: CNNC Nuclear Power Operations Management Co,Ltd.Haiyan, Zhejiang, China Suzhou Nuclear Power Research Institute Suzhou, Jiangsu, China Shanghai Key Lab for Engineering Materials Evaluation, Shanghai Failure Analysis & Safety Evaluation

会议类型: 国内会议

会议名称: The 4th International Symposium on Materials and Reliability in Nuclear Power Plant(第四届核电站材料与可靠性国际研讨会)

会议地点: 沈阳

会议语种:英文

页码: 164-171

在线出版日期: 2015-09-20（万方平台首次上网日期，不代表论文的发表时间）