Searching for optimal reactivity management using a new burnable absorber for SCLWR with (Th, 233U)O2

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-10-10 DOI:10.1016/j.nucengdes.2024.113631

Nassar Alnassar , Sitah Alanazi , Muneerah A. Al-Aqeel , Maha Algarawi , Ahmed Salah Khaliil , A. Abdelghafar Galahom

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Abstract

This work investigates the efficiency of some new burnable absorbers (BAs) suggested to provide possible improvements in the fuel management of a supercritical light water reactor (SCLWR) assembly fueled with (Th, ²³³U)O₂. Four BAs including gadolinium, Erbium, Iridium and Lutetium are suggested as integral burnable absorber (IBA) rods. A three-dimensional model of SCLWR has been modelled using MCNPX version 2.7. A complete neutronic analysis has been carried out for the suggested BAs and compared with the gadolinium vector which is the common BAs. The IBA rods were distributed through the SCWR fuel assembly in a way that provided a flat power distribution. Various concentrations of the suggested BAs have been investigated to obtain the optimum value that can suppress the excess reactivity at the beginning of the cycle and flatten the infinite multiplication factor. The burnup parameters including the fertile, fissile, BAs and most effective fission product concentration as a function of effective full power days (EFPDs) of the SCLWR have been examined for the suggested BAs. The reactivity temperature coefficients have been studied to ensure the viability of the suggested BAs. A further analysis is performed to study the axial, radial power distribution and local power peaking factor.

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利用新型可燃烧吸收器为使用 (Th, 233U)O2 的 SCLWR 寻找最佳反应性管理方法

这项工作研究了一些新的可燃吸收剂（BA）的效率，这些吸收剂可能会改善以(Th, 233U)O2为燃料的超临界轻水反应堆（SCLWR）组件的燃料管理。建议将包括钆、铒、铱和镥在内的四种 BA 作为整体可燃吸收剂（IBA）棒。SCLWR 的三维模型是用 MCNPX 2.7 版模拟的。对所建议的吸收剂进行了完整的中子分析，并与常用吸收剂钆矢量进行了比较。IBA 棒在 SCWR 燃料组件中的分布方式提供了平坦的功率分布。对建议的 BA 的各种浓度进行了研究，以获得最佳值，从而抑制循环开始时的过量反应性，并使无限倍增因子趋于平缓。针对建议的燃烧剂，研究了包括可燃、易燃、燃烧剂和最有效裂变产物浓度在内的燃烧参数，这些参数与 SCLWR 的有效全功率日（EFPDs）成函数关系。研究了反应温度系数，以确保所建议的 BA 的可行性。还进一步分析研究了轴向、径向功率分布和局部功率峰值因数。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.