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Modeling of oxidation of UO2 pellets
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.anucene.2020.107955
Bahador Abolpour

Abstract In this study, a mathematical model has been developed for oxidation of pellets of uranium dioxide in the air at the bulk temperature range between 605 and 727 K. Oxidation of this pellet causes an increment in the size of the UO2 particles, decrement of the pellet porosity and breaking-down of this pellet, subsequently. Therefore, the presented model has two stages for this oxidation process, before and after the breaking-down of the pallet. These stages have different physical properties of the pellet and different mechanisms of the oxidation reaction. The predictions of the presented model is validated using the existed experimental data. It is resulted that increasing the bulk temperature increases the rate of the oxidation reaction and decreases the required times for the breaking-down and complete conversion of the pellet. In addition, increasing the size of the pellet increases the required time for breaking-down and decreases the required time complete conversion of the pellet.

中文翻译:

UO2 球团氧化的建模

摘要 在这项研究中,已经建立了一个数学模型,用于在 605 到 727 K 的整体温度范围内在空气中氧化二氧化铀球团。该球团的氧化导致 UO2 粒子的尺寸增加,减少随后,该颗粒的颗粒孔隙率和分解。因此,所提出的模型对于这种氧化过程有两个阶段,即托盘损坏之前和之后。这些阶段具有不同的丸粒物理特性和不同的氧化反应机制。使用现有的实验数据验证了所提出模型的预测。结果是增加整体温度会增加氧化反应的速率并减少球团分解和完全转化所需的时间。
更新日期:2021-02-01
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