Nuclear accidents that lead to melting of a reactor core create heterogeneous materials
containing hundreds of radionuclides, many with short half-lives. The long-lived fission …

Uraninite is the most common uranium mineral, which, because of chemical and structural
similarities to synthetic UO 2, is a useful natural analogue for UO 2 in spent fuel. Uraninite …

Alteration phases may influence both the dissolution of nuclear waste forms and release of
radionuclides from the waste package environment. In the present study, UO2 pellets serve …

Literature data on the effect of water radiolysis products on spent-fuel oxidation and
dissolution are reviewed. Effects of gamma radiolysis, alpha radiolysis, and dissolved O2 or …

A method to determine the defect structures in hyper-stoichiometric UO2+ x using a
combination of XRD and Raman spectroscopy has been developed. A sequence of phase …

At the Nopal I uranium deposit, primary uraninite (nominally UO 2+ x) has altered almost
completely to a suite of secondary uranyl minerals. The deposit is located in a Basin and …

The behaviour of UO2/water interface under irradiation has been investigated as a function
of alpha flux using an alpha beam provided by a cyclotron. The effects of alpha-radiolysis on …

The behavior of uraninite under hydrothermal, reducing conditions is discussed on the basis
of data in the literature and the authors' investigation of samples from two natural analogue …

The oxidative dissolution of uranium (IV) dioxide has been experimentally investigated as a
function of hydrogen carbonate concentration at 4 different temperatures (10, 25, 45, and …

79Se is a long-lived (1.1× 106 yrs) fission product which is chemically and radiologically
toxic. Under Eh–pH conditions typical of oxidative alteration of spent nuclear fuel, selenite …