Research on the repair schemes of the damaged tube-sheet on a fabricating steam generator of a nuclear power plant

JIN Liang; KUANG Yanjun; QIU Zhensheng; ZOU Jie

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Research on the repair schemes of the damaged tube-sheet on a fabricating steam generator of a nuclear power plant
Vol. 49, Issue 9, Pages: 42-48(2019)
Published：2019
DOI：
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DOI：

JIN Liang, KUANG Yanjun, QIU Zhensheng, et al. Research on the repair schemes of the damaged tube-sheet on a fabricating steam generator of a nuclear power plant[J]. Eletric Welding Machine2019, 49(9): 42-48. DOI：

摘要

某核电厂蒸汽发生器在进行传热管与管板密封焊期间造成管板镍基合金堆焊层及管板低合金母材熔化损伤缺陷

针对缺陷产生原因及缺陷性质进行了试验分析

提出了三种潜在修复方案。从修复方案的可操作性、技术难度、泄露风险、在役检修等方面进行了对比分析

最后确定了回火焊道修复技术方案;同时介绍了回火焊道修复技术方案的实施步骤、工艺试验及结果。该方案在核电工程中得到了应用

可为核电工程中类似缺陷的修复提供借鉴。

Abstract

The nickel-base alloy cladding and low alloy steel base material of tube-sheet were melted down owing to the abnormal heat input during seal welding between the heat transfer tube and the tube-sheet on a fabricating Steam Generator of a Nuclear Power Plant. Three potential repair schemes were proposed

and which were contrastively analyzed and evaluated from the aspects of operability

technical difficulty

leakage risk and in-service maintenance

etc. As a result

the temper bead welding scheme was determined and performed. Furthermore

the implementation schedule

procedure tests and results of the temper bead welding are introduced. The method of temper bead welding has been applied in engineering and can be used for the reference in dealing with similar cases in nuclear power engineering.