CFETR水冷陶瓷增殖剂包层模块产氚率实验验证  

Experimental Verification of Tritium Production Rate in CFETR Water Cooled Ceramic Breeder Blanket Mock up

作　　者：祝庆军 陈舞辉 鲍杰[2] 赵子甲 杜华 黄凯 刘松林 ZHU Qingjun;CHEN Wuhui;BAO Jie;ZHAO Zijia;DU Hua;HUANG Kai;LIU Songlin(Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China;College of Artsand Sciences,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]中国科学院等离子体物理研究所,安徽合肥230031 [2]中国原子能科学研究院核物理研究所,北京102413 [3]国防科学技术大学文理学院,湖南长沙410073

出　　处：《原子能科学技术》2022年第1期127-135,共9页Atomic Energy Science and Technology

基　　金：国家磁约束聚变专项(2017YFE0301601,2017YFE0301604);国家自然科学基金(11175207)。

摘　　要：水冷陶瓷增殖剂(WCCB)包层作为中国聚变工程试验堆(CFETR)候选包层之一,承担着氚增殖、核热提取、屏蔽等重要涉核功能,其中子学设计的可靠性直接影响CFETR氚自持目标的实现。为验证中子学设计工具,即MCNP和FNEDL3.0数据库,在WCCB包层中子学设计中的可靠性,基于研制出的WCCB包层模块,在DT中子环境下开展中子学实验,对以产氚率(TPR)为代表的中子学参数进行了模拟值(C)和实验值(E)对比分析。结果表明,模块中轴线位置处TPR的C/E为0.97~1.08,而模块边缘位置处TPR的C/E为0.65~0.82;模块钛酸锂层边缘区^(197)Au(n,γ)198 Au反应率的C/E为0.72~0.90,表明模块边缘区存在非期望的散射中子,导致该区TPR模拟值和实验值偏离较大。As one of CFETR’s candidate blankets,water cooled ceramic breeder(WCCB)blanket undertakes important nuclear-related functions such as tritium breeding,nuclear heat extraction,and neutron shielding.The reliability of neutronics design directly affects the realization of CFETR tritium self-sustaining goal.In order to verify the reliability of the neutronics design tool,i.e.MCNP and FNEDL databases,in the WCCB blanket neutronics design,the WCCB scaling-down mock up was developed to carry out the neutronics experiment in the DT neutron environment,including two layers of lithium titanate,two layers of beryllium,three layers of cooling plate,and one layer of tungsten armor.The neutronics performance of the mock up are similar with the real blanket module.The mock up neutronics experiments were carried out using DT neutron generator,the simulated value(C)and experimental value(E)of neutronics parameters represented by tritium production rate(TPR)were analyzed.For TPR validation,two independent detection technologies were used,including the Li_(2)TiO_(3) pellets as off-line TPR detectors,and the developed lithium glass detectors as on-line TPR detectors.The TPR validation was complemented by evaluating the predicted neutron-induced reaction rates of the Au,Zr foils.The experiments on the mock up were analyzed by MCNP-4C code and FENDL-3.0 nuclear data libraries,and the source term for Monte Carlo simulation was built using the custom-developed model based on depth profiling of tritium in the tritide target.The analysis results show that the C/E of TPR in the axis of two lithium titanate layers is 0.97 and 1.08 respectively,while there is a large deviation between the calculated and experimental values of TPR in the edge region of the mock up.According to the experimental results from Li_(2)TiO_(3) pellets,the C/E of TPR at the edge of two lithium titanate layers is 0.65 and 0.82,respectively.The TPR is obviously underestimated by simulation at the edge of lithium titanate layers,confirmed by the C/E results of 197 Au(

关 键 词：CFETR 水冷陶瓷增殖剂包层 中子学实验 产氚率 

分 类 号：TL67[核科学技术—核技术及应用]