WIMS-SN程序系统对NHR-10堆物理设计的有效性

组件计算是堆物理计算中的一个重要环节.用WIMS-SN系统计算含可燃毒物组件时,出现比较大的误差,不适宜低温供热堆含可燃毒物组件的计算.文中分析其计算过程,改进了该程序系统,使它可应用于含可燃毒物燃料组件计算.研究发现用WIMS棒束模型计算钆棒栅元归并截面时,使用的能谱是无钆燃料区的能谱,因此会带来较大误差.为了避免这种情况发生,在输运计算中必采用多群多区模型.通过与TPFAP程序校算,二者差别较小,说明该程序系统可以应用于低温供热堆的物理设计.

Validation of WIMS-SN code system for NHR-10 physics design

Analysis of fuel assembly is an important step in reactor physics design. Early studies analyzed using the WIMSSN system had large errors in fuel assembly analyses with burnable poison (BP). This code system is not considered suitable for analysis of fuel assembles with BP. The errors in the code were found by analyzing the routing so the code has now been improved to properly analyze the fuel assemblies with BP. This study shows that: in order to avoid the error caused by energy spectrum calculation model adopted by cluster model in WIMS code, multigroup energy and multiregion geometry should be used in neutron transport calculations to homogenize the burnable gadolinium poison cross section. Comparison with the TPFAP system showed that the difference between the two systems was small, so the WIMSSN system can be used to analyze the nuclear physics in the nuclear heating reactor.