Comparison Of Mixture Models And Free Energy Of Hydration Models For Waste Glass Releases

Mixture and free energy of hydration (FEH) approaches for modelling elemental releases from high level nuclear waste glass as functions of glass composition are compared. The FEH model is shown to be a restricted version of the first-order mixture (FOM) model. The performance of the two approaches in modelling elemental release as a function of glass composition is compared for three data sets. Least squares regression was used to fit both model types to each data set. The resulting FEH and FOM model coefficients and goodness-of-fit statistics are compared.