Gas transport modelling at different spatial scales of a geological repository in clay host rock

Insights into the Impact of Physicochemical and Microbiological Parameters on the Safety Performance of Deep Geological Repositories

“…Moreover, a significant volume of other gasses would be generated with time in the DGR which may affect the long-term safety of the system by shifting the containment functions of engineered and natural barriers through over-pressurization of the repository. In addition, the hydraulic and mechanical properties of engineered barriers and host rock might be altered [130,131]. Gas would be generated through several abiotic processes such as anaerobic corrosion of metal canister and ferrous components in the engineered barrier system, biotic degradation of organic materials and radiolysis of water [130].…”

“…In addition, the hydraulic and mechanical properties of engineered barriers and host rock might be altered [130,131]. Gas would be generated through several abiotic processes such as anaerobic corrosion of metal canister and ferrous components in the engineered barrier system, biotic degradation of organic materials and radiolysis of water [130]. Hydrogen is expected to be the dominant gas generated in a deep geological repository [132,133] and could also potentially act as a carrier for radioactive gaseous species (e.g., H-3, C-14, Rn-222, etc.…”