摘要
为获得更高精度的屏蔽数据库,提高屏蔽计算中关键参数的计算精度,本文利用核数据处理程序NECP-Atlas中屏蔽数据库制作功能模块shield_calc。基于响应贡献理论对屏蔽数据库能群结构进行优化,重点针对屏蔽计算中的热中子注量率以及光子注量率进行改善,并利用SINBAD屏蔽基准题对优化后的能群结构进行验证。数值结果表明:利用优化后的能群结构计算得到的热中子注量率和光子注量率较BUGLE屏蔽数据库原始能群结构计算结果有明显改善,热中子注量率相对偏差由100%下降至30%左右,光子注量率相对偏差由50%下降至10%左右,提高了辐射屏蔽计算中热中子以及光子计算结果的准确性。
To acquire a more accurate shielding library and improve the accuracy of key parameters in shielding calculations,the energy-group structure optimization is performed based on the contributon theory to improve thermal neutron flux and photon flux in shielding calculations using the shielding library generation module in the nuclear data processing code NECP-Atlas.The shielding library with optimized energy-group structure is verified using the SINBAD shielding benchmarks.The numerical results show that the thermal neutron flux and photon flux calculated using the optimized energy-group structure are significantly improved compared with those calculated using the original energy-group structure of the BUGLE-B7 shielding library.The bias of the thermal neutron flux is reduced from 100%to approximately 30%and that of the photon flux is reduced from 50%to approximately 10%,which enhances the accuracy of the thermal neutron flux and photon flux calculation results in the shielding calculations.
作者
徐宁
祖铁军
曹良志
吴宏春
XU Ning;ZU Tiejun;CAO Liangzhi;WU Hongchun(School of Nuclear Science and Technology, Xi′an Jiaotong University, Xi′an 710049, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第12期1843-1850,共8页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(U2067209,12075183).
