FIELD: power industry.
SUBSTANCE: invention can be used for re-processing of off-grade fuel assemblies of fuel elements and assemblies, which have gone through nuclear fuel cycle in the reactor. Dissolution of off-grade and spent nuclear fuel is characterised by use of water solution of ferrum salt as dissolution; at that, dissolution is carried out at pH 1.0-1.4, during 3-5 hours and molar ratio of fuel to ferrum salt equal to 1:2.1-2.5. As ferrum salt there used is ferric chloride or ferric nitrate.
EFFECT: achieving the best ecological, economical and social effects owing to eliminating the use of concentrated solutions of nitric acid, organic solvents and simplifying the further re-processing of spent fuel.
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