COMBINED RETENTION OF MOLYBDENUM AND SULFUR IN SIMULATED HIGH LEVEL WASTE GLASS

[摘要] This study was undertaken to investigate the effect of elevated sulfate and molybdenum concentrations in nuclear waste glasses. A matrix of 24 glasses was developed and the glasses were tested for acceptability based on visual observations, canister centerline-cooled heat treatments, and chemical composition analysis. Results from the chemical analysis of the rinse water from each sample were used to confirm the presence of SO{sup 2-}{sub 4} and MoO{sub 3} on the surface of glasses as well as other components which might form water soluble compounds with the excess sulfur and molybdenum. A simple, linear model was developed to show acceptable concentrations of SO{sub 4}{sup 2-} and MoO{sub 3} in an example waste glass composition. This model was constructed for scoping studies only and is not ready for implementation in support of actual waste vitrification. Several other factors must be considered in determining the limits of sulfate and molybdenum concentrations in the waste vitrification process, including but not limited to, impacts on refractory and melter component corrosion, effects on the melter off-gas system, and impacts on the chemical durability and crystallization of the glass product.

[发布日期] 2009-10-16

[学科分类] 核能源与工程

[关键词] AR FACILITIES;CHEMICAL ANALYSIS;CHEMICAL COMPOSITION;CONTAINERS;CORROSION;CRYSTALLIZATION;GLASS;HEAT TREATMENTS;IMPLEMENTATION;MOLYBDENUM;OFF-GAS SYSTEMS;RADIOACTIVE WASTES;RETENTION;SULFATES;SULFUR;VITRIFICATION;WASTES