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<p>This study examines attapulgite-bentonite-pyrite (AB<sub>7</sub>Fe) and zeolite-bentonite-pyrite (ZB<sub>7</sub>Fe) mixtures as buffer and backfill materials for nuclide migration using soil column experiments and COMSOL modeling. The results indicated that ZB<sub>7</sub>Fe possessed higher adsorption capacities for cesium (Cs) and strontium (Sr) compared to AB<sub>7</sub>Fe. Conversely, AB<sub>7</sub>Fe demonstrated superior retardation performance, more effectively slowing nuclide migration. After 1000&#xa0;years, Cs and Sr concentrations in AB<sub>7</sub>Fe surpassed those in ZB<sub>7</sub>Fe. Additionally, nuclide migration increased with higher initiation pressure, dispersion, and diffusion coefficients. This research is crucial for improving the long-term safety of nuclear waste repositories.</p>

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Simulation of the migration behavior of nuclides Sr and Cs in integrated buffer/backfill materials based on COMSOL

  • 期刊论文

  • 发表日期：

    2025年3月7日

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  • Duan Tian,
  • Zhe Wang,
  • Jiaqian Zhang,
  • Ying Luo,
  • Zhenlong Zhang,
  • Chao Li,
  • Kai Ye,
  • Chaoliang Peng,
  • Yiming Chen,
  • Wenxue Lin,
  • Jingyan Zhang

摘要

This study examines attapulgite-bentonite-pyrite (AB7Fe) and zeolite-bentonite-pyrite (ZB7Fe) mixtures as buffer and backfill materials for nuclide migration using soil column experiments and COMSOL modeling. The results indicated that ZB7Fe possessed higher adsorption capacities for cesium (Cs) and strontium (Sr) compared to AB7Fe. Conversely, AB7Fe demonstrated superior retardation performance, more effectively slowing nuclide migration. After 1000 years, Cs and Sr concentrations in AB7Fe surpassed those in ZB7Fe. Additionally, nuclide migration increased with higher initiation pressure, dispersion, and diffusion coefficients. This research is crucial for improving the long-term safety of nuclear waste repositories.