Abstract
Abstract Sodium titanium phosphate (NTP), a potential host for immobilization of high level nuclear waste resulting from the reprocessing of spent nuclear fuel was synthesized by two simple wet chemical methods and characterized. Based on the characterization of pristine NTP, one of these synthesis methods was employed for the preparation of simulated waste loaded NTP. The waste loading and the synthesis conditions were varied systematically to study phase behavior of the waste form. Up to 15 wt% simulated waste of fast reactor origin was immobilized and the final phase assemblage comprised of NTP as major phase and monazite like phase as secondary phase. The NTP waste form was characterized by XRD and SEM-EDS; elemental mapping showed the waste constituents to be homogenously distributed in the waste form. The leach resistance of the simulated waste form was studied and was found to exhibit excellent chemical durability.
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