增材制造核燃料部件入堆应用及监管路线研究OA

Additive manufacturing technology,with its advantages in fabricating complex structures and enhancing compo-nent performance,presents significant application prospects in the development of nuclear fuel components.However,China's current nuclear regulatory framework lacks specific technical requirements for additive manufacturing processes,and corresponding nuclear safety supervision practices are yet to be established,which hinders the engineering application of this technology in the nuclear field.This paper systematically investigates the safety evaluation system and in-reactor regulatory pathway for additively manufactured components established by the U.S.Nuclear Regulatory Commission(NRC),with particular emphasis on analyzing the material performance evaluation methodology and licensing process for Westinghouse's additively manufactured thimble plugging devices.Based on this analysis and considering China's nuclear safety regulatory framework,this study proposes an evaluation system and regulatory implementation pathway for in-reactor application of additively manufactured nuclear fuel components,encompassing out-of-pile and in-pile material performance verification as well as component functional qualification.The results can provide technical support and regulatory refer-ences for promoting the application of additive manufacturing technology in domestic nuclear fuel development and com-mercial reactor irradiation testing.