Influence of welding deformation on cutting and replacement of control rod drive mechanism in nuclear power plant

焊接变形对核电厂控制棒驱动机构切割更换的影响及分析 Influence of welding deformation on cutting and replacement of control rod drive mechanism in nuclear power plant 谭文良 TAN Wenliang 1 first-author 朱德才 ZHU Decai 1 李全星 LI Quanxing 1 李付良 LI Fuliang 1 中广核工程有限公司 中广核工程有限公司 China Nuclear Engineering Co.,Ltd China Nuclear Engineering Co.,Ltd 核电厂控制棒驱动机构(CRDM)焊缝用于机构密封,在核电厂建造和运行在役阶段存在更换CRDM的情况,需要切割CRDM下部焊缝,修复切割坡口后重新安装或者采用新的CRDM部件重新焊接、检测。针对核电厂CRDM切割更换工作难点,通过CRDM标准试件切割和焊接试验,分析了焊接变形对CRDM切割、坡口修复、再焊接的影响,并对CRDM切割后的重新安装组对间隙和CRDM部件的选择方案提出建议,为核电厂CRDM切割更换提供参考。 The control rod drive mechanism（CRDM） weld is used for mechanism sealing in nuclear power plant. CRDM replacement occurs during the construction and operation of nuclear power plant. At this time,the lower weld of CRDM needs to be cut, and after repairing cutting groove,the CRDM will be reinstalled,or a new CRDM parts will be re welded and inspected.Aiming at the difficulties of CRDM cutting and replacement in nuclear power plant,through the cutting and welding test of CRDM standard specimens,the influence of welding deformation on CRDM cutting,groove repair and rewelding is analyzed. And the suggestions are put forward about the clearance of reinst-allation and the selection of CRDM components after CRDM cutting,which provides reference for CRDM cutting and repla-cement in nuclear power plant. 核电厂 控制棒驱动机构(CRDM) 焊接变形 切割 nuclear power plant control rod drive mechanism（CRDM） welding deformation cutting TG404;TM623 2022-03-08 8 50