METHOD FOR DISSOLVING SUBSTANDARD PRODUCTS OF MOX FUEL PRODUCTION Russian patent published in 2021 - IPC G21C19/46 C01G43/00 C01G56/00 

FIELD: radiochemical technologies.

SUBSTANCE: invention relates to radiochemical technologies, namely to methods for dissolution of substandard solid-propellant MOX fuel composition, which is a mixture of uranium and plutonium dioxides or uranium-plutonium dioxide, sintered. The method for dissolving substandard tableted products of MOX fuel production includes the joint dissolution of uranium and plutonium in concentrated nitric acid. The substandard material is a mixture of uranium and plutonium dioxides or uranium-plutonium dioxide. It is transferred to a finely dispersed state, then treated with 250-440 g/l with a solution of nitric acid at a ratio of the mass of substandard material to the volume of nitric acid in the range of 1:(5÷7) with periodic introduction of a concentrated solution of hydrogen peroxide at a temperature of 40-60°C.

EFFECT: allows dissolving at least 98% of substandard tableted products produced by MOX fuel with obtaining a combined uranium-plutonium nitrate solution, which does not contain additionally introduced metal ions that are not part of the MOX fuel, as well as corrosive components.

5 cl, 1 dwg