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High-level nuclear waste produced from fuel reprocessing operations at the Savannah River Site requires pretreatment to remove 134,137Cs, 90Sr, and alpha-emitting radionuclides (i.e., actinides) prior to disposal onsite as low level waste. An inorganic sorbent, monosodium titanate, is currently used to remove 90Sr and alpha-emitting radionuclides, while a caustic-side solvent extraction process is used for removing 134,137Cs. A new peroxotitanate material has recently been developed and has shown increased removal kinetics and capacity for 90Sr and alpha-emitting radionuclides compared to the current baseline material. This article describes recent results focused on further characterization of this material. [ABSTRACT FROM AUTHOR]

Researchers at the Savannah River Site (SRS) have studied adsorption of uranium, plutonium, and neptunium onto monosodium titanate (MST) at conditions relevant to operation of the Actinide Removal Process (ARP) facility. This study measured actinide loadings at a large phase ratio of simulated wastes solution to mass of MST. The large phase ratio was designed to mimic the maximum phase ratio that would occur during a single process cycle of the ARP facility. Uranium and plutonium loadings measured in this study proved much higher than previous measurements at lower phase ratios. [ABSTRACT FROM AUTHOR]