Screening and Management of Dead-End Pipe in Qinshan NPP
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摘要: 介绍压水堆核电厂"死管段"现象的发生条件和腐蚀失效产生机理。根据"死管段"筛选流程对秦山核电厂300 MW机组可能存在的死管段进行了全面筛选,确定了需重点关注的管段,并提出了针对这些管段的管理对策。结果表明,"死管段"现象是由死管段内水的饱和汽化造成的,其原因是水被加热到较高的温度和管段内的压力不能维持高于饱和压力。管理方面建议通过完善相关规程来控制和缓解死管段现象,通过系统改造彻底消除死管段现象。Abstract: This paper introduces the occurring conditions for dead-end pipe phenomenon and the corrosion failure mechanism in the pressurized water reactor nuclear power plant. According to the screening process for the dead-end pipes, the dead-end pipes in the Qinshan nuclear power plant of 300 MW Unit is screened to determine the dead-end pipes concerned. Management countermeasures are proposed. The results show that the dead-end pipe phenomenon is caused by the water saturation vaporization in the dead-end pipe, and the reason is that the water in the dead-end pipe is heated and the pressure can not be maintained higher than the saturation pressure. The dead-end pipe phenomenon can be control and alleviate by improving the relevant procedures, and can be eliminated completely by system modification.
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Key words:
- NPP /
- Dead-end pipe /
- Screening /
- Countermeasures
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