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基于燃耗信任制的方法,采用APOLLO和MCNP5程序对格架中可溶硼浓度对中子有效增殖因子(keff)的影响进行研究,并对中子毒物类型和布置方式对keff的影响进行了分析。结果表明:格架中可溶硼的浓度变化引起keff变化的速率随着富集度升高而变慢,近似线性变化。格架内中子毒物间的互相干涉效应是影响其毒物价值的主要原因,中子毒物价值与硼不锈钢(BSS)板间距呈线性关系。根据乏燃料组件外中子能谱的分布改进中子毒物的布置方案,可以提高乏燃料贮存系统的临界安全性和经济性。
Based on the method of fuel consumption trust, APOLLO and MCNP5 programs were used to study the effect of soluble boron concentration on neutron effective growth factor (keff), and the effects of neutron poison types and arrangement on keff analysis. The results show that the rate of keff change caused by the concentration of soluble boron in the grid decreases with the increase of enrichment and changes approximately linearly. The inter-interference effect of neutron poison in the grid is the main reason that affects the poison value. The neutron poison value has a linear relationship with the boron stainless steel (BSS) plate spacing. Improving the arrangement of neutron toxins based on the distribution of neutron energy spectra outside spent fuel assemblies can improve the critical safety and economy of spent fuel storage systems.