基于D-T聚变中子源的双功能液态铅锂包层中子学实验  

Neutronics experiments of dual functional lithium-lead blanket based on D-T fusion neutron source

作　　者：曾正魁 陈思泽[2] 章勇 王海霞[2] 熊厚华 ZENG Zhengkui;CHEN Size;ZHANG Yong;WANG Haixia;XIONG Houhua(School of Nuclear Technology and Chemistry&Biology,Hubei University of Science and Technology,Xianning 437100,China;Institute of Nuclear Energy Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]湖北科技学院核技术与化学生物学院,咸宁437100 [2]中国科学院合肥物质科学研究院核能安全技术研究所,合肥230031

出　　处：《核技术》2022年第4期58-66,共9页Nuclear Techniques

基　　金：国家重点研发计划政府间国际科技创新合作专项磁约束核聚变能发展研究(No.2017YFE0300305);湖北科技学院博士启动基金项目(No.BK202207)资助。

摘　　要：中国双功能锂铅包层(Dual Functional Lithium-Lead,DFLL)是由中国科学院合肥物质科学研究院核能安全技术研究所设计的用于聚变反应堆的液态包层。由于聚变反应堆氚增殖包层的设计高度依赖于中子计算,为验证DFLL包层设计中所使用的核数据库和仿真软件,建立了DFLL包层实验模块,并基于D-T聚变中子源开展一系列中子学实验。然后选用Nb活化箔和^(238)U裂变电离室分别进行中子产额测量和相对中子源强度监测,并用Li_(2)CO_(3)活化片和多活化箔分别测量了DFLL包层实验模块不同深度处的产氚率(Tritium Production Rates,TPR)和多活化箔反应率;最后采用SuperMC程序结合JEFF3.2核数据库进行蒙特卡罗模拟计算,并将模拟结果与实验测量的TPR和反应率进行比较。结果表明:中子源强测量不确定度控制在4.2%以内,产氚率的计算结果与实验结果比(Calculation results to Experimental data,C/E)在1.0~1.07区间吻合,多活化箔反应速率在0.77~1.1区间吻合,验证了包层中子学设计中氚增殖率计算的准确性。[Background]China Dual Functional Lithium-Lead(DFLL)blanket is designed by the Institute of Nuclear Energy Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences for fusion reactor.Since the designs of fusion reactor tritium breeding blankets are highly depended on neutronics calculation,nuclear data and simulation software used for DFLL cladding design is needed to be verified.[Purpose]This study aims to evaluate the feasibility of nuclear data and code in DFLL cladding design by neutronics experiments.[Methods]First of all,a DFLL mock-up was built and a series of neutronics experiments were performed on the D-T Fusion Neutron Generator.Then,a combination of Nb activated foil with reaction channel ^(93)Nb(n,2n)^(92m)Nb and ^(238)U fission chamber was chosen in this experiment for neutron yield measurement and relative neutron source intensity monitoring respectively.The Li_(2)CO_(3) pellets and activation foils were used to measure the tritium production rates(TPR)and the multi-threshold reaction rates at different depths in the DFLL mock-up respectively.Finally,the measured TPR and reaction rates of the activation foils were compared with Monte Carlo simulation results coupled with JEFF3.2 nuclear data library.[Results]The comparison results show that measurement uncertainty of neutron source intensity is within 4.2%,and the ratios of calculation results to experimental data(C/E)are 1.0~1.07 on TPRs and 0.77~1.1 on reaction rates.[Conclusions]The obtained results indicate that the tritium breeding ratio in neutronics design can be accurately evaluated.

关 键 词：聚变包层 中子学实验 产氚率 氘氚聚变中子源 

分 类 号：TL64[核科学技术—核技术及应用]