核电厂疏水管道穿孔原因分析及处理

Analysis and Treatment of Drain Pipe Through-wall Leak in Nuclear Power Plants

针对核电厂疏水管道穿孔、阀件冲蚀损坏现象,通过分析流动加速腐蚀和气蚀对管道破坏的影响,确定调节阀后气蚀是引起故障的根本原因。在保证系统功能满足设计规范的前提下,通过调整阀门开度的方法,重新分配管道各级压降,可有效避免气蚀的发生。针对疏水管道的冲蚀破坏,提出了相关建议。

Aiming at the phenomena of drain pipe through-wall leak and valve part erosion in nuclear power plants,the main cause of failure was confirmed to be cavitation taking place behind valves by analyzing the influence of flow accelerated corrosion(FAC)and cavitation on water pipes.On the base of system functions consistent with design criteria,cavitation could be effectively avoided by adjusting the opening of valves and redistributing pressure drop inside pipes.Some advice had been given to solve the problem of erosion in drain pipes.