[en] Recently developed reference schedules for processing high-level nuclear wastes into solid glass froms at Savannah River provide bases for economic evaluations of potential improvements of glass melter design and operation. Greater melter output is achieved through increases in capacity and attainment and possible higher glass waste loadings. The economic evaluation indicates only minor beneficial impacts on total waste disposal costs for melter outputs greater than current reference values. In contrast, cost impacts are detrimentally large for outputs less than reference values, providing important incentives for development to ensure the reference output. The limits on cost benefits for greater-than-reference output are not intrinsic to on melter feed specified to control radiation and heat loads of the product glass waste form. 14 ref., 3 figs., 1 tab