Event Timeslots (1)
Day 2 – June 21
The implementation of an engineered multi-barrier approach for nuclear waste disposal, to mitigate the release of radionuclides over the operational lifetime of a geological disposal facility (GDF), requires a detailed understanding of the interactions between steel canisters, engineered backfill and natural barriers. Accordingly, the influence of Fe species on the long-term durability of vitrified high-level waste (HLW) is an important consideration in the safety case for a GDF. The presence of Fe in many UK-specific HLW feedstocks allows for Fe-glass interactions to occur as a result of both Fe from within the glass network, and Fe from the environment. Here, short- and long-term laboratory-based studies are combined with observations from glasses exposed to complex natural environments to understand the effect of Fe on glass dissolution under a variety of geochemical conditions relevant to geological disposal.