CPR1000主管道焊缝缺陷问题分析

CPR1000主管道焊缝缺陷问题分析 Analysis on defect prob lem of weld of CPR1000 main coolant line 张进 ZHANG Jin 1 first-author 吴伟帮 WU Weibang 1 董义令 DONG Yiling 1 中广核工程有限公司 中广核工程有限公司 China Nuclear Power Engineering Co.,Ltd. China Nuclear Power Engineering Co.,Ltd. 针对某改进型三环路压水堆(CPR1000)主管道与蒸汽发生器出口接管安全端焊缝安装阶段射线检验(RT)合格、而役前检查(PSI)阶段射线检验发现未熔合缺陷显示的问题,进行了分析处理。针对返修操作对已进行的一回路系统水压试验结果的有效性造成影响,在解读RCC-M、RSE-M、ASME规范第Ⅲ卷及第Ⅺ卷中水压试验相关条款的基础上,提出了"焊接返修后采用两种体积检验方法或一种经评定的体积检验方法"进行无损检验的解决方案,确保了一回路系统水压试验结果的有效性。 During pre-service inspection（PSI） of a certain CPR1000 nuclear power plant,a lack of fusion is found in the weld between main coolant line（MCL） and outlet nozzle safe end of steam generator（SG） which complies with the requi-rements of radiographic testing（RT） during erecting,and the defect is repaired. For the problem about the validity of the main primary system hydraulic test with the effect of welding repair of MCL weld, based on comprehensive analysis of the relevant items about hydraulic testing in RCC-M code,RSE-M code,Section Ⅲ and Section Ⅺ of ASME code,a solution for nondestructive testing is proposed,which is an examination comprising two volumetric examinations or an examination comprising a single volumetric examination,that ensures the validity of hydraulic test of the main primary system. CPR1000 主管道 焊缝 射线检验 缺陷 水压试验 CPR1000 main coolant line weld radiographic examination defect hydrostatic test TG441.7 2022-03-08 11 50