The project went on to consider how voidage in a GDF might evolve, and the implications for post-closure performance. Bounding scenarios of the evolution of voidage were developed in the context of the coupled Thermo-Hydro-Mechanical-Chemical (THMC) evolution of the GDF, in particular considering chemical and mechanical processes, and a range of different host rocks. The study concluded that non‑encapsulated wastes in Robust Shielded Containers (RSCs) may generally be acceptable in all host rocks, but non-encapsulated wastes in standard containers are only likely to be acceptable in limited numbers. The project report, 'An initial evaluation of the nature and amount of voidage associated with an ILW GDF' is available from the RWMD bibliography.
Image courtesy of NDA RWMD