METHOD OF SPENT FUEL REGENERATION Russian patent published in 2010 - IPC G21C19/44 

FIELD: power engineering.

SUBSTANCE: method of spent fuel regeneration has stage of spent fuel dissolution in solution of nitric acid, stage of electrolysis/control of valency, with recovery of Pu to trivalent condition and preservation of pentavalent condition of Np, stage of uranium extraction with accumulation of UO₂ by means of fuel contact with organic solvent and extraction of hexavalent uranium with the help of extracting agent; stage of deposition with oxalic acid, resulting in joint deposition of secondary actinides and products of fission remained in solution of nitric acid, in the form of oxalate residue; stage of chlorination with conversion of oxalate residue into chlorides by addition of hydrochloric acid to oxalate residue; stage of dehydration with production of synthetic waterless chlorides by means of chlorides dehydration in flow of gaseous argon; and stage of electrolysis in melt of salts with dissolution of waterless chlorides in melted salt and accumulation of uranium, plutonium and secondary actinides on cathode as a result of electrolysis.

EFFECT: high reliability of nuclear materials non-dissolution.

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