基于SARAX-LAVENDER的快堆光子释热行为分析

Analysis of Gamma-Heating Behavior in Fast Reactor Based on SARAX-LAVENDER

为填补LAVENDER程序在求解中子-光子耦合输运方程和精确计算堆内光子释热率分布2方面的不足,本文制作了适用于快堆的中子-光子数据库,利用中子通量密度分布,通过输运计算得到快堆内精细的光子通量密度分布,使用比释动能因子,计算了中子和光子的释热,开发了中子-光子耦合输运模块和释热率计算模块,并将其集成在LAVENDER程序中。利用BUGLE96数据库,对比了LAVENDER程序与HYDRA程序的中子-光子耦合输运结果,验证了LAVENDER程序的正确性。用LAVENDER程序计算了各组件的光子释热份额,结果表明,整个堆芯中光子的释热份额约为10%,反射层组件中光子的释热份额约为80%,控制棒组件中光子的释热份额约为20%,增殖组件和燃料组件中光子的释热份额较低,均约为10%,该结果与蒙特卡罗程序的计算结果符合较好。

In this paper,a neutron-gamma data library suitable for fast reactors is made.By using the neutron flux density distribution,the fine gamma flux distribution in the fast reactor is obtained via transport calculation.And the KERMA factor is used to calculate the heating release of neutrons and gammas.The neutron-gamma coupled transport module and the heating calculation module are developed and integrated into LAVENDER code.By using the BUGLE96 library,the neutron-gamma coupled transport results of the LAVENDER code and the HYDRA code are compared,and the correctness of the LAVENDER code is verified.The LAVENDER code is used to calculate the gamma-heating fraction of each assembly.The results show that the gamma-heating fraction in the entire reactor core is about 10%,the fraction in the reflector assembly is about 80%,and in the control rod assembly is about 20%.The gamma-heating fractions in the fuel assembly and blanket assembly are relatively low,both are about 10%.The results are in good agreement with the calculation result of the Monte Carlo program.