UO_(2)-不锈钢燃料棒的光纤激光切割研究  

Experimental Study on Fiber Laser Cutting of UO_(2)-stainless Steel Fuel Rod

作　　者：常尚文[1] 晏太红[1] 郑卫芳[1] 李高亮[1] 邹树梁[2] 王新林 肖魏魏 王湘江[2] 唐德文[2] CHANG Shangwen;YAN Taihong;ZHENG Weifang;LI Gaoliang;ZOU Shuliang;WANG Xinlin;XIAO Weiwei;WANG Xiangjiang;TANG Dewen(Department of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China;Hunan Provincial Key Laboratory of Emergency Safety Technology and Equipment for Nuclear Facilities,University of South China,Hengyang 421001,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]南华大学,核设施应急安全技术与装备湖南省重点实验室,湖南衡阳421001

出　　处：《原子能科学技术》2021年第8期1523-1528,共6页Atomic Energy Science and Technology

摘　　要：为验证光纤激光用于燃料组件解体和燃料棒切割的可行性,研究光纤激光用于热物性差别很大的UO_(2)芯块-不锈钢包壳管复合结构的切割和铀芯块的切割质量,本文采用光纤激光切割UO_(2)芯块-316Ti包壳管元件棒,并通过扫描电子显微镜、能谱和X射线衍射对UO_(2)芯块的切断面进行微观表征分析,研究激光切割过程对铀芯块切断的表面微观形貌、元素组成及物相的影响。研究结果表明,光纤激光可用于切割UO_(2)芯块-316Ti包壳管元件棒,激光切割过程虽会造成铀芯块切断面出现大量微孔和碎渣,但不会造成UO_(2)的相变。以上结果表明,光纤激光可用于UO_(2)芯块-316Ti包壳管元件棒的切割,通过后续对激光切割系统的抗辐射屏蔽防护,可应用于乏燃料组件解体和乏燃料棒切割。In order to verify the feasibility of using fiber laser for fuel assembly disassembly and fuel rod cutting,the cutting quality of UO_(2) pellet-stainless steel cladding composite structure with great difference in thermal properties and fuel rod pellet cutting quality were studied.Scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD)were used to characterize the microstructure of cross-section of UO_(2) pellets.And the effects of laser cutting process on the surface morphology,element composition and phase of uranium pellets were studied.The results show that fiber laser can be used to cut nuclear fuel rod which is composed of UO_(2) pellets and 316Ti cladding.Although the laser cutting process leads to a lot of micropores and fragments on the cutting section,it doesn’t cause the phase transformation of UO_(2).This study shows that the fiber laser can be used in the cutting of nuclear fuel rod which is composed of UO_(2) pellets and 316Ti cladding.Through the subsequent radiation shielding protection of the laser cutting system,the fiber laser can be applied to the spent fuel assembly disassembly and spent fuel rod cutting.

关 键 词：UO_(2)-不锈钢包壳 光纤激光切割 切断面 

分 类 号：TL941.3[核科学技术—辐射防护及环境保护]