Simulated high-level commercial fluidized-bed calcine was treated to form sintered glass-ceramics (SGC) by sintering compacted mixtures of calcine with aluminosilicate fluxes at temperatures ranging from 965 to 1070°C. Products are resistant to impact and thermal shock and exhibit leach rates of 10−5 to 10−9 g/(cm2 day). Up to 67 wt% calcine is used, giving waste volumes as low as 0.040 m3 /MTU reprocessed. Storage centerline temperatures up to 800°C appear feasible. A conceptual process in which SGC is molded into thin-walled containers for processing and canister loading is proposed.