破损燃料定位系统铝管腐蚀原因分析及处理

Analysis and Processing for Corrosion of Aluminum Tube in the Failed Fuel Positioning System

针对某重水堆核电厂大修期间发现的破损燃料定位系统铝制标定孔道套管点蚀现象,本文对其腐蚀机理进行了探讨和验证,确定是硝酸根等杂质离子浓度高导致了铝管腐蚀,并据此制定了该系统水箱的水化学指标以控制腐蚀的进一步发展,最终解决了破损燃料定位系统铝管的点蚀问题。

In the failed fuel positioning system of a heavy water nuclear power plant,the pitting corrosion of the dry well tube made of aluminum is found during overhaul.Therefore,the corrosion mechanism is discussed and verified in this work,which shows that the high concertation of impurities such as NO_(3)^(-)is the cause of corrosion of aluminum tube,and the chemical indicator of the system is developed then.Finally,the pitting corrosion issue of aluminum pipe of the failed fuel positioning system is solved.