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首页> 外文会议>Scientific basis for nuclear waste management XXXIV >Characterization of the penetration mechanisms of water into polycrystalline UO_2
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Characterization of the penetration mechanisms of water into polycrystalline UO_2

机译：水对多晶UO_2的渗透机理的表征

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摘要

Following containment failure in the scenario of geological disposal of spent nuclear fuel, the penetration rate of groundwater into the UO_2 matrix could cause a rapid increase of the fraction of inventory becoming available for prompt dissolution. In this respect, oxygen and water diffusion mechanisms are key issues to investigate. In this work, secondary-ion-mass-spectrometry (SIMS) depth profiling has been applied to characterize a polycrystalline UO_2 pellet exposed to ~(18)O-labelled water at room temperature. ~(18)O depth profiling up to 25 μm beneath the pellet surface clearly indicates a combination of oxygen diffusion into the UO_2 lattice and water diffusion along grain boundaries, behaving as high diffusivity paths. The lattice diffusion coefficient of oxygen, D_L, and the quantity δDg - product of the grain boundary width, ＜5, and the grain boundary diffusion coefficient of water, D_B - have been measured, resulting in D_L = (2.5 ± 0.1) ·10~(-24)m~2s~(-1) and δD_B= (7.5 ± 0.3)· 10~(-24) m~3 s~(-1).
机译：在对废弃核燃料进行地质处置的情况下，由于安全壳失效，地下水进入UO_2基质的渗透率可能导致可立即溶解的库存比例迅速增加。在这方面，氧气和水的扩散机理是需要研究的关键问题。在这项工作中，二次离子质谱（SIMS）深度分析已应用于表征室温下暴露于〜（18）O标记的水中的多晶UO_2颗粒。 〜（18）O深度剖析到丸粒表面以下25μm清楚地表明，氧扩散到UO_2晶格和水沿着晶界扩散，具有高扩散路径。测量了氧的晶格扩散系数D_L以及量δDg-晶界宽度＜5与水的晶界扩散系数D_B-的乘积，得出D_L =（2.5±0.1）·10 〜（-24）m〜2s〜（-1），δD_B=（7.5±0.3）·10〜（-24）m〜3 s〜（-1）。

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  • 来源
  • 会议地点 San Francisco CA(US);San Francisco CA(US)
  • 作者

    Ilaria Marchetti; Fabio Belloni; Jerome Himbert; Paul Carbol; Thomas Fanghanel;

  • 作者单位

    European Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;

    rnEuropean Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;

    rnEuropean Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;

    rnEuropean Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;

    rnEuropean Commission, Joint Research Centre, Institute for Transuranium Elements, P.O. Box 2340, D-76125 Karlsruhe, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 放射性废物管理及综合利用;
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