Abstract
The Idaho Chemical Processing Plant (ICPP), located at the Idaho National Engineering and Environmental Laboratory (INEEL), was built in the early 1950’s to reprocess government-owned, spent nuclear fuel. The fuel assemblies were completely dissolved and highly-enriched uranium was recovered from the resulting acidic liquid using modified PUREX and REDOX-type solvent extraction processes. Liquid raffinates were stored in single-shell stainless-steel tanks, as acidic liquids, until they were solidified in a fluidized bed calciner. Incidental wastes, primarily from solvent washing activities, evaporator bottoms and decontamination activities were also stored in the underground storage tanks. Because the incidental wastes were not considered “high-level wastes”, they were collected in separate tanks from the extraction raffinates. The incidental wastes typically contained a relatively high amount of sodium and potassium, and are difficult to calcine in a fluidized bed because the alkali metals melt and form agglomerates. The incidental wastes were blended with extraction process raffinates prior to calcination to deplete their inventory.
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