As a burnable absorber, gadolinium oxide (Gd₂O₃) is widely used in light water reactors due to the high neutron absorption cross section of several gadolinium isotopes and its good solid solubility in UO₂. However, some isotopes of natural Gd cause residual reactivity suppression, while some are not efficient neutron absorbers, reducing the efficiency of the burnable absorber when implemented. In this study, fuel assemblies utilizing gadolinium oxide enriched with ¹⁵⁷Gd isotope were modelled using Monte Carlo particle transport methods and compared to fuel with a natural Gd based absorber. Reactivity gains were examined over the life of the assembly utilizing ¹⁵⁷Gd-enriched absorber as compared to natural gadolinia. A preliminary economic evaluation is also made to assess the commercial benefits of using ¹⁵⁷Gd-enriched burnable absorber. Use of enriched gadolinium oxide is shown to eliminate residual reactivity caused by natural gadolinium oxide, and similar reactivity properties (and therefore criticality margins) can be achieved with less burnable absorber in the fuel. The financial cost of incorporating enriched Gd isotopes into nuclear fuel has also been estimated.

氧化g（Gd ₂ O ₃）作为可燃吸收剂，由于几种g同位素的中子吸收截面高，并且在UO _2中具有良好的固溶性，因此被广泛用于轻水反应堆中。但是，某些天然Gd同位素会抑制残留的反应性，而有些则不是有效的中子吸收剂，因此在实施时会降低可燃吸收剂的效率。在这项研究中，利用蒙特卡洛粒子传输方法对利用富含¹⁵⁷ Gd同位素的氧化g燃料组件进行了建模，并将其与基于天然Gd吸收剂的燃料进行了比较。在整个组装过程中，使用¹⁵⁷检查了反应性的提高与天然氧化ado相比，富含Gd的吸收剂。还进行了初步的经济评估，以评估使用富含¹⁵⁷ Gd的可燃吸收剂的商业利益。已显示使用富集的氧化oxide可消除由天然氧化caused引起的残留反应性，并且在燃料中可燃吸收剂较少的情况下，可以获得类似的反应性（因此临界临界裕度）。还估计了将富集的Gd同位素掺入核燃料的财务成本。