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首页> 外文期刊>Physics and chemistry of the earth >Investigation of two-phase flow phenomena associated with corrosion in an SF/HLW repository in Opalinus Clay, Switzerland
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Investigation of two-phase flow phenomena associated with corrosion in an SF/HLW repository in Opalinus Clay, Switzerland

机译：在瑞士Opalinus Clay的SF / HLW储存库中研究与腐蚀相关的两相流现象

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Gas generation from corrosion of the waste canisters and gas accumulation in the backfilled emplacement tunnels is a key issue in the assessment of long-term radiological safety of the proposed repository for spent fuel and high-level waste (SF/HLW) sited in the Opalinus Clay formation of Northern Switzerland. Previous modeling studies indicated a significant pressure buildup in the backfilled emplacement tunnels for those sensitivity runs, where corrosion rates were high and the permeability of the Opalinus Clay was very low. As an extension to those studies, a refined process model of the canister corrosion phenomena has been developed, which accounts not only for the gas generation but also for the water consumption associated with the chemical reaction of corrosion of steel under anaerobic conditions. The simulations with the new process model indicate, that with increasing corrosion rates and decreasing host-rock permeability, pressure buildup increased, as expected. However, the simulations taking into account water consumption show that the pressure buildup is reduced compared to the simulation considering only gas generation. The pressure reduction is enhanced for lower permeability of the Opalinus Clay and for higher corrosion rates, which correspond to higher gas generations rates and higher water consumption rates. Moreover, the simulated two-phase flow patterns in the engineered barrier system (EBS) and surrounding Opalinus Clay show important differences at late time of the gas production phase as the generated gas continues to migrate outward into the surrounding host rock. For the case without water consumption, the water flow indicates overall downward flow due to a change in the overall density of the gas-fluid mixture from that based on the initially prescribed hydrostatic pressure gradient. For the case with water consumption, water flow converges toward the waste canister at a rate corresponding to the water consumption rate associated with the corrosion reaction. The water flow toward the canister is maintained even for very low permeabilities of the Opalinus clay sustaining the anaerobic corrosion of the steel canister. (C) 2008 Elsevier Ltd. All rights reserved.
机译：废物罐腐蚀产生的气体以及回填式安置隧道中的气体蓄积是评估拟建在Opalinus中的乏燃料和高放废物（SF / HLW）拟议储存库的长期放射安全性的关键问题瑞士北部的粘土形成。先前的模型研究表明，对于那些敏感度较高的运行，回填位移隧道中会形成显着的压力累积，这些位置的腐蚀速率很高，而Opalinus粘土的渗透性非常低。作为对这些研究的扩展，已经开发了罐腐蚀现象的精确过程模型，该模型不仅考虑了气体的产生，还考虑了与厌氧条件下钢腐蚀的化学反应相关的水消耗。用新工艺模型进行的模拟表明，随着腐蚀速率的增加和基岩渗透性的降低，压力累积如预期的那样增加。但是，考虑到耗水量的模拟表明，与仅考虑气体产生的模拟相比，压力的累积得以降低。为了降低蛋白石粘土的渗透性和提高腐蚀速率，可以降低压力，这对应于更高的气体产生速率和更高的耗水率。此外，在工程屏障系统（EBS）和周围的Opalinus粘土中的模拟两相流动模式在产气后期较晚时显示出重要的差异，因为生成的气体继续向外迁移到周围的基质岩中。对于不用水的情况，由于气体-流体混合物的总密度相对于基于最初规定的静水压力梯度的总密度的变化，水流指示总的向下流动。对于耗水的情况，水流以与腐蚀反应相关的耗水率相对应的速率向废料罐汇聚。即使Opalinus粘土的渗透性非常低，也能保持朝向罐的水流量，从而保持钢罐的厌氧腐蚀。 （C）2008 Elsevier Ltd.保留所有权利。

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