High-level waste composition, properties and preparation for long-term storage after pyroelectrochemical reprocessing of irradiated oxide uranium-plutonium fuel

Composition, properties and outputs of high-active products and wastes have been studied after pyroelectrochemical reprocessing of BN-350 and BOR-60 reactor irradiated MOX fuel The main amount of fission products, actinides and impurities is concentrated in a small volume of solid recycled products - uranium dioxides of two types and high-active wastes - phosphate deposit and spent salt electrolyte. The phosphate deposit and electrolyte are subject to the final disposal but uranium dioxides are returned to the cycle after a certain period of storage. Based on the study of waste properties it was concluded that they can be kept in sealed stainless steel containers without treatment for a long time. The phosphate deposit may be confined in alumo-fluorine-phosphate glass to make an additional safety barrier before the final disposal.