用于乏燃料组件上下端部活化源项分析的截面库研究

Cross-section library study on the activated source term calculation at the upper and lower ends of spent fuel assembly

基于乏燃料组件上下端部活化源项精细化分析的需求,自制精细化问题相关截面库,并通过对比分析,研究不同截面库应用特点:活性区截面库和热中子截面库应用于活化源项计算时均存在较大的计算误差;组合截面库对共振群和快群截面的处理偏保守,当程序应用于上下端头活化源项计算时,分析结果偏保守;基于问题相关中子能谱自制的反应截面更加接近真实情况,基于此的计算结果也最接近真实情况。

Based on the needs of refined analysis of activated source term at the upper and lower ends of the spent fuel assembly,through comparative analysis,different cross section libraries are applied to the calculation of activated source term at the upper and lower ends of the spent fuel assembly.The main conclusions include:The active region cross section library and thermal neutron cross section library have large calculation errors when applied to the calculation of the activated source term.The combined cross section library is conservative in the processing of the resonance group and the fast group cross-section,which leads to the conservative analysis results.The problem related cross section library is closer to the real situation.