大亚湾及岭澳核电站旁路给水隔离阀导流环缺损原因分析

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Analysis on Damage Cause of Belt Eyes for Bypass Feedwater Isolation Valves of Daya Bay and Ling’ao NPPs

1. China Nuclear Power Technology Research Institute, Co. Ltd., Shenzhen, Guangdong, 518026, China;
2. Daya Bay Nuclear Power Operation and Management Co. Ltd, Shenzhen, Guangdong, 518124, China

摘要: 对大亚湾及岭澳核电站所有的旁路给水隔离阀进行解体检查时,发现导流环均存在不同程度的缺损。对缺损的导流环进行宏观形貌、化学成分、金相、扫描电镜、流体力学模拟等分析。结果表明,导流环的介质流速超出厂家要求限值从而使导流环发生流体加速腐蚀和空泡腐蚀。根据导流环缺损原因,提出了相应的纠正措施。
- 核电站 /
- 隔离阀 /
- 流体加速腐蚀 /
- 空泡腐蚀
Abstract: When all of bypass feedwater isolation valves of Daya Bay and Ling’ao NPPs were inspected under disassembled condition,it was found that the belt eyes were damaged in various degrees.The analysis on macro appearance,chemical composition,metallographic,Scanning Electron Microscope and fluid mechanics simulation were carried out on the damaged belt eyes.The results show that the flow rate of belt eye is well above the manufacturer’s recommendation so that flow accelerated corrosion and cavitation erosion occur on the belt eyes.According to the damage causes of the belt eyes,corresponding corrective actions are proposed.
- NPPs /
- Isolation valve /
- Flow accelerated corrosion /
- Cavitation corrosion