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Current reactors spent nuclear UO 2  fuel, that will probably enter geologic formations for disposal, is assumed to get into contact with groundwater of a repository earliest after several thousands of years. After this time, its alpha activity will be still high enough to induce a process of water radiolysis that leads to production of oxidants and, probably, to the oxidative dissolution of the material, that could start a mobilisation of radiotoxic nuclides. The main oxidant produced during this process would be hydrogen peroxide (H 2 O 2 ), which is thermodynamically unstable and can decompose during reactions with certain groundwater ions. Information on the stability of H 2 O 2  is therefore important for assessing the behaviour of the material in the repository.

A kinetic study of UO 2 dissolution and H 2 O 2 stability in the presence of groundwater ions