CPR1000核岛主设备建造的无损检测与役前检查

Construction NDT and PSI for CPR1000 nuclear island main equipment

针对CPR1000核岛主设备在建造阶段的无损检测合格,而在役前检查(PSI)阶段发现焊缝"超标缺陷"的工程问题,对核岛主设备建造阶段和役前检查阶段的无损检测技术要求进行了对比分析,得出可能会产生不一致差异项的结论,同时对典型案例进行了分析,并制定了工程可行的协同解决方案。考虑到役前检查的主要目的是建立在役检查的"零点",提出如下观点:对于役前检查阶段所发现的"疑似超标缺陷",应采用建造阶段的要求进行复检和评定,如满足要求,则应评定该缺陷合格。

During pre-service inspection(PSI)of CPR1000 nuclear primary components,"unacceptable defect"was found in the welds which were complying with the requirements of nondestructive testing during construction.To solve the problem,the NDT requirements between construction and PSI have been analyzed,typical engineering cases have been also demonstrated,and the feasible reconciliation engineering solutions have been developed.On account of PSI being considered to act as a"zero point"for in-service inspection,the following view point is hence postulated that"suspected unacceptable defects"found during PSI,if possible,should be re-examined and evaluated in accordance with the testing method and acceptance criteria during construction.If the re-examination result meets the requirement,the welds with the above-mentioned defects should be categorized as acceptable.