The hydrodynamic effects of gas release from an underground nuclear waste repository are examined using the multiphase simulator TOUGH. Pressurization of the repository is found to be strongly affected by absolute and relative permeability characteristics of the backfill material, and to a lesser extent by its air-entry capillary pressure. Analysis of worst-case scenarios indicate the creation of significant pressure gradients which could cause structural damage to the repository. The use of a vent to allow gas outflow into the near-field helps in dissipating excess pressures and establishing pressure equilibrium throughout the repository.
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- A Parametric Study of Gas Migration From an Underground Nuclear Waste Repository
- Springer Netherlands