核电厂控制棒驱动组件耐压壳检验技术研究

Development of Inspection Technique for NPP Control Rod Drive Mechanism Upper Canopy

控制棒驱动组件耐压壳属于一回路压力边界,其失效将直接导致一回路冷却剂的丧失。2010年9月,国外某核电站6号机组大修期间,发现控制棒驱动组件耐压壳头部密封区域存在裂纹显示。为确定同类型国内某核电机组是否存在类似缺陷,组织开展了无损检验方法研究。本文着重介绍了针对控制棒驱动组件耐压壳涡流检验方法研究,并确定具体的无损检验方法和技术。

Control rod drive mechanism(CRDM)upper canopy belongs to primary loop pressure boundary,its failure will directly result in the loss of primary coolant.September 2010,during the 6th outage of one foreign nuclear power plant,found cracks on upper canopy seal area of the CRDM.To determine whether the domestic NPP,as the same type unit,have similar defects,the team is commissioned to research and develop nondestructive inspection technique.This paper highlights the research of eddy current inspection for CRDM upper canopy of nuclear NPP.