Water-Steel Canister Interaction and H2 Gas Pressure Buildup in aNuclear Waste Repository

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Corrosion of steel canisters, stored in a repository forspent fuel and high-level waste, leads to hydrogen gas generation in thebackfilled emplacement tunnels, which may significantly affect long-termrepository safety. Previous modeling studies used a constant H2generation rate. However, iron corrosion and H2 generation rates varywith time, depending on factors such as water chemistry, wateravailability, and water contact area. To account for these factors andfeedback mechanisms, we developed a chemistry model related to ironcorrosion, coupled with two-phase (liquid and gas) flow phenomena thatare driven by gas pressure buildup and water consumption. Resultsindicate that if H2 generation rates are dynamically calculated based ona ... continued below

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Xu, Tianfu; Senger, Rainer & Finstele, Stefan January 2, 2007.

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Corrosion of steel canisters, stored in a repository forspent fuel and high-level waste, leads to hydrogen gas generation in thebackfilled emplacement tunnels, which may significantly affect long-termrepository safety. Previous modeling studies used a constant H2generation rate. However, iron corrosion and H2 generation rates varywith time, depending on factors such as water chemistry, wateravailability, and water contact area. To account for these factors andfeedback mechanisms, we developed a chemistry model related to ironcorrosion, coupled with two-phase (liquid and gas) flow phenomena thatare driven by gas pressure buildup and water consumption. Resultsindicate that if H2 generation rates are dynamically calculated based ona chemistry model, the degree and extent of gas pressure buildup are muchsmaller compared to a simulation in which the coupling between flow andreactive transport mechansism is neglected.

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  • The Twelth International Symposium on Water-RockInteraction, Kunming, China, July 31 - August 5,2007

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  • Report No.: LBNL--62246
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 932683
  • Archival Resource Key: ark:/67531/metadc902746

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Office of Scientific & Technical Information Technical Reports

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  • January 2, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • March 23, 2018, 4:10 p.m.

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Xu, Tianfu; Senger, Rainer & Finstele, Stefan. Water-Steel Canister Interaction and H2 Gas Pressure Buildup in aNuclear Waste Repository, article, January 2, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc902746/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.