核电厂汽水分离再热器壳体减薄原因分析及处理

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Analysis and Treatment of Shell Reduction of Moisture Separator and Reheater for Nuclear Power Stations

1. Nuclear Power Institute of China Key Laboratory of Science and Technology on Nuclear Fuel and Materials, Chengdu, 610213, China;
2. CNNC Nuclear Power Operations Management Co. Ltd., Haiyan, Zhejiang, 314300, China

摘要: 秦山核电厂320 MWe机组经过长期运行后,1#汽水分离再热器出现壳体减薄现象,通过分析认为壳体减薄的原因为流动加速腐蚀(FAC)。若任由设备继续腐蚀,将进一步降低设备强度,给核电机组带来极大的运行安全风险。通过修复工艺分析,选择合适的焊材、焊接工艺和热处理工艺,对设备进行焊接维修处理,有效提高了汽水分离再热器的运行可靠性,保证了设备和机组的运行安全。
- 汽水分离再热器 /
- 流动加速腐蚀(FAC) /
- 焊接
Abstract: After long-term operation, the thickness of the shell of the 1# Moisture Separator and Reheater in CNNO Qinshan PhaseⅠPower Plant has been reduced. The analysis reveals that the flow accelerated corrosion is the root cause. If the corrosion is allowed to continue, the equipment strength will be further reduced, resulting in great operational security risk to the nuclear power station. Analysis of the repair process analysis and repairement of the moisture separator and reheater equipment with suitable welding material, welding procedure and heat treatment process can effectively improve the operation reliability of the moisture separator and reheater, and ensure the operation safety of the nuclear power station.
- Moisture separator and reheater（MSR） /
- Flow accelerated corrosion（FAC） /
- Weld