Rock-Water Interaction, Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland.
Safety Assessment Management (SAM) Switzerland GmbH, Liebefelsweg 9, 5313 Klingnau, Switzerland.
J Contam Hydrol. 2020 Jan;228:103561. doi: 10.1016/j.jconhyd.2019.103561. Epub 2019 Oct 12.
In a deep geological repository for radioactive waste in the Opalinus Clay, disposal canisters may be corroded due to sulphide produced by sulphate reducing bacteria (SRB). This paper presents two computational models, a reactive transport model (RTM) and a simplified semi-analytical model (SM), to evaluate the potential of SRB to generate elevated sulphide concentrations, to assess sulphide fluxes to the canister and, in a simplified manner, the resulting canister corrosion. Calculations performed in the context of the repository's safety assessment based on a shared conceptual model reveal that the two computational models are complementary. The reactive transport model incorporates state-of-the-art understanding of the system's geochemistry, but is currently too computationally demanding to be applied in probabilistic safety assessment sensitivity analyses. The simplified model is fast and efficient, but some of its assumptions need to be verified, and some parameter values need to be calibrated using the more complete reactive transport model. Nonetheless, given the same set of assumptions, the two models predict comparable magnitudes of sulphide fluxes to the canister and comparable canister corrosion depths.
在放射性废物的深部地质处置库中，由于硫酸盐还原菌（SRB）产生的硫化物，处置罐可能会被腐蚀。本文提出了两个计算模型，即反应传输模型（RTM）和简化半解析模型（SM），以评估 SRB 产生高浓度硫化物的潜力，评估硫化物向容器的通量，并以简化的方式评估由此产生的容器腐蚀。基于共享概念模型进行的存储库安全评估计算表明，这两个计算模型是互补的。反应传输模型结合了对系统地球化学的最新理解，但目前计算要求过高，无法在概率安全评估敏感性分析中应用。简化模型快速高效，但需要验证其某些假设，并使用更完整的反应传输模型对某些参数值进行校准。尽管如此，在相同的假设条件下，这两个模型预测了可比的向容器的硫化物通量和可比的容器腐蚀深度。
