Socket welds are widely used for small diameter pipelines in nuclear power plants due to their ease of assembly and welding. However, feedbacks show that a large number of failures caused by vibration have occurred in the welds, which clearly demonstrates that their ability to resist high cycle fatigue is particularly weak. After failure analysis, from the view of engineering practice and application, the countermeasures are put forward and discussed, including adopting butt weld instead of socket weld in the construction stage of the new unit, implementing vibration diagnosis and treatment measures, carrying out proactive reinforcement by overlay, and using phased array UT for in-service supervision.
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