CORROSION MECHANISMS AND THEIR CONSEQUENCES FOR NUCLEAR POWER PLANTS WITH LIGHT WATER REACTORS
CORROSION MECHANISMS AND THEIR CONSEQUENCES FOR NUCLEAR POWER PLANTS WITH LIGHT WATER REACTORS
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发表时间：
2009
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通讯作者：
H. Berg
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作者：
H. Berg
众所周知，轻水反应堆的运行条件对腐蚀过程有很大的影响。本文概述了根据德国报告标准向当局报告的事件评估，在操作实践中确定了哪些类型的腐蚀。研究发现，应力腐蚀开裂是造成裂纹的主要原因。虽然压水堆的结构、系统和部件已经达到了很高的质量标准，但仍提供了几个不同腐蚀机制及其后果的例子。建议在维修期间检查有关辅助材料或液体使用的工厂规范，并在使用检查的框架内目测检查奥氏体管道的外表面是否有粘合剂或胶带残留。然而，过去两年的事件表明，这些问题是不可能完全避免的。
It is well known that operational conditions in light water reactors strongly influence the corrosion processes. This paper gives an overview which types of corrosion are identified in operating practice based on the evaluation of events which are reported to the authorities in line with the German reporting criteria. It has been found that the main contributor is the stress corrosion cracking. Several examples of different corrosion mechanisms and their consequences are provided for PWR although a high standard of quality of structures, systems and components has been achieved. Recommendations have been given to check the plant specifications concerning the use of auxiliary materials or fluids during maintenance as well as to examine visually the outer surfaces of austenitic piping with regard to residua of adhesive or adhesive tapes within the framework of in-service inspections. However, events in the last two years show that such problems cannot be totally avoided.