Two-phase modelling for fission gas sweeping in restructuring nuclear oxide fuel

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-28 DOI:10.1016/j.nucengdes.2024.113602

G. Zullo , A. Scolaro , T. Barani , D. Pizzocri

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Abstract

In this work, we propose a modelling approach for the intra-granular fission gas behaviour in UO₂ under restructuring process. Leveraging the definition of restructured volume fraction, we consider the fuel matrix transition from the non-restructured to the restructured phase, together with the evolution of the corresponding fission gas concentrations retained in the fuel matrix. Firstly, we derive a sweeping term that exchanges fission gas atoms from the non-restructured to the restructured fuel region. The sweeping term is then included in the conventional intra-granular fission gas diffusion problem. Secondly, the spectral diffusion algorithm is employed to solve two spatially-dimensionless problems, properly representing the non-restructured region with micrometric grains and the restructured region with sub-micrometric grains. The model developed is implemented in SCIANTIX, a 0D meso-scale code for physics-based modelling of fission gas behaviour in nuclear oxide fuel and compared with experimental data and semi-empirical models.

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重组氧化物核燃料中裂变气体扫除的两相模型

在这项工作中，我们提出了一种在重组过程中二氧化铀晶内裂变气体行为的建模方法。利用重组体积分数的定义，我们考虑了燃料基质从非重组阶段到重组阶段的转变，以及燃料基质中保留的相应裂变气体浓度的演变。首先，我们推导出一个扫描项，用于将裂变气体原子从非重组燃料区交换到重组燃料区。然后，在传统的粒内裂变气体扩散问题中加入扫频项。其次，采用光谱扩散算法来解决两个无空间维度的问题，分别恰当地表示具有微米级晶粒的非重组区域和具有亚微米级晶粒的重组区域。所开发的模型在 SCIANTIX 中实施，SCIANTIX 是一种 0D 中尺度代码，用于对核氧化物燃料中的裂变气体行为进行物理建模，并与实验数据和半经验模型进行比较。

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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.