Abstract
The hydrothermal dissolution behavior of two simulated nuclear waste forms, a borosilicate glass and a tailored ceramic, was investigated by three types of high pressure apparatus: sealed gold capsules in cold seal pressure vessels, a rocking autoclave apparatus, and a fluid injection, flow-through type apparatus. Saturation of the solutions was observed in both cold seal and rocking autoclave apparatus which provide information about limiting solubilities, solid reaction products, and kinetic data near saturation. The flow-through system provides kinetic data at high undersaturations and gives the hydrothermal dissolution rates that are most comparable to leach rates determined with atmospheric pressure measurements.
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