压水堆缓发裂变光子能谱制作及其在堆内构件辐射发热分析中的应用研究  

Processing of Delayed Fission Gamma-Ray Spectra in PWR and the Application in Reactor Internals Heating Rate

作　　者：丁谦学 彭超 梅其良 DING Qianxue;PENG Chao;MEI Qiliang(Shanghai Nuclear Engineering Research and Design Institute,Shanghai 200233,China)

机构地区：[1]上海核工程研究设计院有限公司,上海200233

出　　处：《核科学与工程》2022年第5期1019-1023,共5页Nuclear Science and Engineering

摘　　要：本工作重点开展易裂变核素缓发光子裂变谱加工方法研究,完成缓发光子裂变谱加工程序的开发,并基于最新发布的ENDF/B-VⅢ.0库,制作了各裂变核素(^(235)U、^(238)U、^(239)Pu、^(240)Pu、^(241)Pu和^(242)Pu)的缓发光子裂变谱,初步验证表明制作方法的正确性;最后基于新制作的裂变谱开展堆内构件辐射发热率分析,分析结果表明:(1)缓发裂变光子对堆内构件辐射发热率的贡献与瞬发裂变光子相当;(2)缓发裂变光子与瞬发裂变光子对堆内构件辐射发热率的贡献之和最大可达35%,距离堆芯越近,贡献越大,而远离堆芯的堆内构件辐射发热率主要来自于次级光子的贡献。This paper focus on the generation methodology of delayed fission gamma-ray spectra,and a delayed gamma-ray fission spectra processing program was developed.Based on the newly released ENDF/B-VⅢ.0 library,the delayed gamma-ray fission spectra of each fissile nuclide,such as ^(235)U,^(238)U,^(239)Pu,^(240)Pu,^(241)Pu and ^(242)Pu,were generated following the methodology proposed by this paper.The preliminary verification shows that the method is correct.In addition,the newly processed fission spectra were used to analyze the radioactive heating rate of reactor internals.The analysis shows that the contribution of delayed fission gamma to the heating rate of reactor internals is similar to that of prompt fission gamma,and that the contribution of delayed fission gamma and prompt fission gamma to the heating rate of reactor internals is up to 35%,and the closer the reactor core is,the greater the contribution is.

关 键 词：缓发裂变光子 瞬发裂变光子 瞬发裂变中子 辐射发热 

分 类 号：TL48[核科学技术—核技术及应用]