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Analogous materials for studying spent nuclear fuel: The influence of particle size distribution on the specific surface area of irradiated nuclear fuel

机译:研究乏核燃料的类似材料:粒度分布对辐照核燃料比表面积的影响

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摘要

Knowledge of the reactive surface that a given material presents to reactive species is one of the fundamental factors for the discussion of experimental data from the alteration of a solid at laboratory scale, or the extrapolation to different environmental conditions. The reactive surface depends on several factors such as the origin of the solid, for example, history of irradiation, the particle size distribution and the history of its reactive surface. Here we discuss the relation between the particle size distribution and the specific surface area for different uranium oxides, namely, irradiated fuel, SIMFUEL and several fresh - non-irradiated - uranium oxides. The analysis is made comparing our own data with values reported in the literature. Our analysis strongly suggests that it is necessary to establish the surface area time evolution in order to model its behaviour in different scenarios where the alteration process will happen. Moreover, this is required in both, dry and wet conditions. A first step to get this function is the determination of the particle size distribution dependence of the specific surface area.
机译:已知给定材料对反应性物质的反应性表面的知识是讨论实验数据的基本因素之一,这些数据来自实验室规模的固体变化或外推至不同的环境条件。反应性表面取决于多种因素,例如固体的来源,例如,辐照历史,粒度分布和其反应性表面的历史。在这里,我们讨论了不同铀氧化物(即辐照燃料,SIMFUEL和几种新鲜的非辐照铀氧化物)的粒度分布与比表面积之间的关系。通过将我们自己的数据与文献中报道的值进行比较来进行分析。我们的分析强烈建议,有必要建立表面积时间演变,以便在发生变化过程的不同情况下对其行为进行建模。此外,在干燥和潮湿条件下都需要这样做。获得此功能的第一步是确定比表面积的粒度分布依赖性。

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