基于热管冷却反应堆堆芯有效增殖系数的敏感性分析  

Sensitivity Analysis to Effective Increment Factor in Heat Pipe Cooled Reactor Core

作　　者：李凯旋 张勤拓 魏强林 刘义保[1,2] 杨波 LI Kaixuan;ZHANG Qintuo;WEI Qianglin;LIU Yibao;YANG Bo(Nuclear Science and Technology National,East China University of Technology,Nanchang 330013,China;Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013 [2]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《能源研究与管理》2023年第3期58-63,共6页Energy Research and Management

基　　金：国家自然科学基金项目(11965001);江西省自然科学基金项目(20212BAB201004);东华理工大学博士启动基金项目(DHBK2021005);江西省质谱科学与仪器重点实验室开放基金项目(JXMS202111)。

摘　　要：核数据作为反应堆计算的输入参数,其敏感性对堆芯物理计算至关重要。基于美国橡树岭实验室开发的反应堆蒙特卡洛中子输运程序MCNP6.1,以美国爱荷华国家实验室(INL)设计的热管冷却反应堆INL Design A为研究对象,调用美国的ENDF/B-Ⅷ.0评价核数据库,对堆芯处于热态(1000 K)零功率且控制棒均未插入工况时的堆芯有效增殖系数进行敏感性分析。计算结果表明:有效增殖系数对235U的平均裂变中子数产额、裂变反应截面敏感性系数分别高达0.88702、0.52898;高能区的235U的平均裂变中子数产额和裂变反应截面,238U平均裂变中子数和裂变截面,^(16)O、^(27)Al和^(56)Fe弹性散射截面,中能区的^(238)U(n,γ)反应截面,^(16)O、^(27)Al和^(56)Fe弹性散射截面具有较大的敏感性,在反应堆物理计算过程中应重点关注。Nuclear data,as the input parameter for reactor calculation,is crucially important for the sensitivity of core physical calculation.The sensitivity analysis of effective increment factor was carried out under zero-power condition and with all control rods withdrawn at a hot temperature(1000 K),depending on the core of the INL Design A reactor,using the Monte Carlo neutron transport program MCNP6.1 developed by Oak Ridge National Laboratory,and utilizing the ENDF/B-Ⅷ.0 evaluated nuclear database.The calculation results show that the effective increment factor has a significant impact on the average number of fission neutrons produced by 235U and the fission reaction cross-section sensitivity coefficient,which are as high as 0.88702 and 0.52898,respectively.In addition,the sensitivity of the average number and cross-section of fission neutrons of 235U and 238U,as well as elastic scattering cross-sections of^(16)O,^(27)Al,and^(56)Fe in the high-energy region,and the(n,γ)reaction cross-section of 238U,as well as elastic scattering cross-sections of^(16)O,^(27)Al,and^(56)Fe in the intermediate-energy region,were found to be significant.Therefore,particular attention should be paid to these factors in the physical calculation process of the reactor.

关 键 词：热管冷却反应堆 ENDF/B-Ⅷ.0 有效增殖系数keff 敏感性 

分 类 号：TL32[核科学技术—核技术及应用]