Modeling and burnup analysis of Uranium dioxide (${\mathrm{U}\mathrm{O}}_2)$ and Mixed Oxide (MOX) fuel in square assemblies comprising both solid and annular rods was carried out. The lattice pitch of the models was optimized first in terms of infinite multiplication factor ($k_{\infty }$) using OpenMC. The burnup analysis was performed at the optimized pitch by lattice physics code Dragon for 1620 EFPD. The burnup dependent fission rate density was studied, and the thermal fission rate was found higher for the models as compared to reference designs. The values of $k_{\infty }$ and reactivity were determined and higher values were found for the models at low fuel burnup period. However, models showed a higher criticality period than the reference design consisting of only the annular rod. The fuel and moderator temperature sensitivity of reactivity was investigated for different fuel burnup periods. The burnup-dependent atomic concentrations of fissionable materials, minor actinides, and neutron poisons were also studied. The production of neutron poison, namely Xe-135 and Sm-149 and minor actinides viz. Np-237, Am-241, Cm-242 and Cm-244 were found lower in models as compared to the reference designs.

二氧化铀的建模和燃耗分析（${\mathrm{你}\mathrm{哦}}_2)$和混合氧化物 (MOX) 燃料在方形组件中进行，包括实心棒和环形棒。首先根据无限倍增因子优化模型的晶格间距（${克}_{\infty }$) 使用 OpenMC。燃耗分析由用于 1620 EFPD 的晶格物理代码 Dragon 在优化的间距下进行。研究了与燃耗相关的裂变速率密度，发现与参考设计相比，模型的热裂变速率更高。的价值观${克}_{\infty }$和反应性被确定，并且在低燃料燃烧期的模型中发现了更高的值。然而，模型显示出比仅由环形杆组成的参考设计更高的临界期。研究了不同燃料燃烧期的反应性的燃料和慢化剂温度敏感性。还研究了可裂变材料、微量锕系元素和中子毒物的燃耗依赖原子浓度。中子毒物的产生，即 Xe-135 和 Sm-149 以及次锕系元素。与参考设计相比，模型中的 Np-237、Am-241、Cm-242 和 Cm-244 含量较低。