Failure Analysis on AFA 3G Gd Rod from Nuclear Power Plants
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摘要: 核电厂运行期间,发现冷却剂放射性水平增高,怀疑1根钆(Gd)棒发生破损。通过在中国原子能科学研究院进行的热室检验,确定该Gd棒下端塞环焊缝处存在破损,且堵孔焊点失效。利用氢分析仪对上、下端环焊缝附近以及破损的下端塞进行了氢分析,检验结果表明:下端塞环焊缝处的氢含量为1720μg/g,为二次氢化破口;上端塞附近氢含量为133μg/g,破损堵孔焊点为Gd棒的初次破口。堵孔焊点失效是钆棒破损的根本原因。Abstract: The coolant radioactivity increased during the reactor operation, and a Gd rod was suspicious to be failed. The post-irradiation examination in China Institute of Atomic Energy confirmed that both ends of the Gd rod were failed, and the hydrogen content analysis showed that the hydrogen content at the position of lower plug welding was 1720μg/g, while that was only 133μg/g at the position nearby the upper plug hole welding. That means the failure at lower plug welding was a secondary failure, and the upper failure was primary. The failure root cause of Gd rod was hole welding failure.
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Key words:
- Gd rod /
- Secondary hydride failure /
- Primary failure /
- Plug hole welding Plug welding /
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