反应堆贯穿件J形焊缝残余应力研究1）

焊接残余应力是引起应力腐蚀开裂的主要原因，准确地掌握残余应力的分布是对结构完整性评定的关键.为了探明反应堆压力容器顶盖控制棒驱动机构（control rod drive mechanism，CRDM）贯穿件J形焊缝残余应力的分布，本研究加工两个CRDM贯穿件实验模拟件，采用盲孔法测试两个J形接头的焊接残余应力.通过实验探明了CRDM贯穿件焊缝残余应力的分布规律，为反应堆压力容器结构完整性的研究提供必要参考.

EXPERIMENTAL RESEARCH OF RESIDUAL STRESS OF J-SHAPED WELDS IN CRDM PENETRATION

The welding residual stress is the main cause of the stress corrosion cracking. The accurate deter-mination of the residual stress distribution in the soldering seam of the structure is the key step to assess the structure integrity. In this paper, two penetration prototypes of the control rod drive mechanism (CRDM) are manufactured using the same processing technique and design method of the real CRDM penetration product, and the blind-hole method is selected to test the welding residual stress of the two J-shaped welds, in order to explore the residual stress distribution of J-shaped welds in the penetrations of the control rod drive mechanism in the reactor pressure vessel closure head. Experimental analysis has determined the residual stress distribution of J-shaped welds of CRDM penetrations in the reactor pressure vessel closure head, which can provide the necessary reference for the study of the structure integrity of reactor pressure vessels.