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Failure analysis on abnormal bursting of heat transfer tubes in spiral-wound heat exchanger for nuclear power plant

机译：核电站螺旋缠绕式热交换器中传热管异常爆破的故障分析

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摘要

A spiral-wound heat exchanger failed to work during the reliability test of nuclear power plant and abnormal bursting of the heat transfer tubes was found after disassembling inspection. To solve this problem, a series of macroscopic and microscopic analysis methods were conducted, and finite element analysis was also used to analyze the stress distribution of the failed heat transfer tube. The results indicated that the stress corrosion cracking (SCC) caused by the interaction of the tensile stress induced by inappropriate fabrication, the aggressive chloride and hot alkaline environment from the media and the susceptible austenite stainless steel materials degraded by improper surface treatment was the root cause of this failure. The failure mechanisms were discussed and the relevant countermeasures were proposed to prevent the occurrence of the similar failure again. Considering that the failure case of spiral-wound heat exchanger was reported rarely so far, the achievement of this paper would provide useful experience for the safety maintenance management of spiral-wound heat exchanger in the future.
机译：螺旋缠绕的热交换器在核电站的可靠性测试期间未能工作，并且在拆卸检查后发现了传热管的异常爆破。为了解决这个问题，进行了一系列宏观和微观分析方法，并且还用于分析失效的传热管的应力分布。结果表明，由不适当的制造，来自培养基的腐蚀性和热碱性环境诱导的拉伸应力相互作用引起的应力腐蚀裂纹（SCC）和易受性奥氏体不锈钢材料的腐蚀性和热碱性环境因不正确的表面处理而降解的根本原因这个失败。讨论了失败机制，提出了相关的对策，以防止再次发生类似的失败。考虑到螺旋缠绕热交换器的故障情况很少迄今为止，本文的成就将为未来提供螺旋缠绕热交换器的安全维护管理的有用经验。

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