2.2. Containment of the waste and isolation of the waste from the biosphere, is an accepted management strategy for radioactive waste [1]. Containment and isolation can be provided through a series of complementary barriers, e.g. the waste form itself, waste containers, backfill materials and the host geology, each of which will be effective over different timescales. The depth of disposal and the characteristics of the host geological environment provide isolation from the biosphere and reduce the likelihood of inadvertent or unauthorized human intrusion. Moreover, emplacement at depth in a stable geological formation may significantly reduce the influence of climatic and other surface processes.