Analyses were performed to evaluate leaching impacts on low-activity waste glass mass projections, both with and without uncertainties. A preliminary set of advanced glass models, constraints, and uncertainty descriptions was used. The maximum allowable waste oxide loading (WOL) was estimated for waste compositions while simultaneously satisfying all applicable glass property and composition constraints with sufficient confidence. Prediction and composition/process uncertainties were included in some of the calculations to evaluate their impacts on glass mass. Two sets of waste compositions were used in calculations, one with caustic leaching of solids and one without leaching. In addition, glass formulation estimates either included or did not include ad hoc constraints to limit WOL, known as “line rules.”
Calculation results are shown below. Application of both process and prediction uncertainties increased the glass mass projections by only 0.28 to 1.03 relative percent when line rules were used. Leaching of high-level waste sludge resulted in a roughly 21 relative percent increase in projected glass mass.