超高通量堆辐照生产^(252)Cf关键因素研究  

Study on Key Factors of^(252)Cf Production in Super High Flux Reactor

作　　者：谢运利 王连杰[1] 蔡云[1] 夏榜样[1] 黄学良 娄磊[1] Xie Yunli;Wang Lianjie;Cai Yun;Xia Bangyang;Huang Xueliang;Lou Lei(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu,610213,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《核动力工程》2024年第5期243-248,共6页Nuclear Power Engineering

摘　　要：^(252)Cf核素是反应堆启动和中子活化分析等领域的重要材料,开展^(252)Cf辐照生产方法研究意义重大。^(252)Cf质量数大、转换链长、生产难度大,本文基于铅冷快中子超高通量研究堆重点开展^(252)Cf辐照生产关键技术研究。根据^(252)Cf生产方法的难点,建立高精度核数据库和靶件长寿期模拟计算方法,开展靶件结构及材料设计、中子能谱及中子注量率等关键因素研究。^(252)Cf靶件辐照计算表明,^(252)Cf虽然转换率低,但在辐照靶件结构、中子能谱及中子注量率方面可进行优化设计,从而提高^(252)Cf生产效率;提出通过共振屏蔽优化中子局部能谱的方法,减少核素裂变消耗,从而提高^(252)Cf生产效率。本文阐明^(252)Cf生产机理和关键因素影响规律,并给出辐照生产^(252)Cf的设计论证方向。^(252)Cf is widely used in reactor startup and neutron activation analysis,and it is of great significance to carry out research on irradiation production technology.Production of^(252)Cf is not easy because of its huge nucleon number and long nuclide transmutation chain.Based on the lead-cooled fast neutron super high flux research reactor,this paper focuses on the key technologies of its irradiation production.According to the difficulty of^(252)Cf production,a precise nuclide databank and longtime burnup calculating procedure of nuclide production targets are established,and the key factors such as target structure and material design,neutron energy spectrum and neutron flux density are studied.The irradiation calculation of^(252)Cf target shows that although^(252)Cf has a low transmutation productivity,it can be improved with appropriate designs of^(252)Cf target,neutron energy spectrum and neutron flux density,thus improving the production efficiency of^(252)Cf.A method of optimizing neutron local energy spectrum through resonance shielding is proposed to reduce fission consumption of nuclides,thus improving the production efficiency of^(252)Cf.This paper expounds the production mechanism of^(252)Cf and the influence law of key factors,and gives the demonstration direction of^(252)Cf irradiation production technology design.

关 键 词：同位素生产 超高通量堆 ^(252)Cf 共振屏蔽 

分 类 号：TL921[核科学技术—核燃料循环与材料]