Water-steel canister interaction and H2 gas pressure buildup in a nuclear waste repository
Corrosion of steel canisters, stored in a repository for spent fuel and high-level waste, leads to hydrogen gas generation in the backfilled emplacement tunnels, which may significantly affect long-term repository safety. Previous modeling studies used a constant H2 generation rate. However, iron corrosion and H2 generation rates vary with time, depending on factors such as water chemistry, water availability, and water contact area. To account for these factors and feedback mechanisms, we developed a chemistry model related to iron corrosion, coupled with two-phase (liquid and gas) flow phenomena that are driven by gas-pressure buildup and water consumption. Results indicate that if H2 generation rates are dynamically calculated based on a chemistry model, the degree and extent of gas pressure buildup are much smaller compared to a simulation in which the coupling between flow and reactive transport mechansism is neglected.
T.Xu S.Finsterle R.Senger
Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA INTERA Inc., Research Blvd., Austin, Texas, USA
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
673-676
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）