Abstract

Specific features of the porous structure of irradiated and virgin reactor graphite of Russian brands have been analyzed. The porosity parameters affecting the leaching of radionuclides from graphite radioactive waste (RAW) were determined: fraction of open porosity, distribution of pore throat cross-sections, surface of open pores. The volume of open pores accessible for leaching aqueous media in the irradiated graphite was estimated. A model describing the leaching of radionuclides from irradiated graphite accounting for the porosity contribution is proposed. The parameters that numerically characterize the resistance of graphite RAW against leaching and are independent of the geometric shapes of separate fragments (samples) were determined.

中文翻译：

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接触液体介质的辐照石墨中长寿命放射性核素释放机理的多孔结构参数确定

摘要

分析了俄罗斯品牌辐照过的原始反应堆石墨的多孔结构的特定特征。确定了影响从石墨放射性废物（RAW）中浸出放射性核素的孔隙度参数：开放孔隙率的分数，孔喉横截面的分布，开放孔的表面。估计了可浸出的孔隙的体积，可用于浸提石墨中的水性介质。提出了一个描述了从辐照石墨中浸出放射性核素的模型，该模型考虑了孔隙度的影响。确定了参数，这些参数在数值上表征了石墨RAW的抗浸出性，并且与单独的碎片（样品）的几何形状无关。