REGENERATION METHOD OF SPENT NUCLEAR FUEL AND OBTAINING OF MIXED URANIUM-PLUTONIUM OXIDE Russian patent published in 2011 - IPC G21C19/46 

FIELD: power industry.

SUBSTANCE: regeneration method of spent nuclear fuel and obtaining of mixed uranium-plutonium oxide, which involves the following stages: separation of uranium and plutonium from fission products, americium and curium, which are present in water nitrate solution formed at dilution of spent nuclear fuel in nitric acid; at that, this stage includes at least one operation of joint extraction of uranium in oxidation degree (VI), and plutonium in oxidation degree (IV), from the above water solution, by contact of this solution to solvent phase not mixing with water, containing at least one extracting agent; distribution of uranium and plutonium, which are extracted together at the first stage, between two water phases, and namely the first water phase containing plutonium and uranium, and the second water phase containing uranium, but not containing plutonium; cleaning of plutonium and uranium, which are present at the first water phase obtained after the second stage from fission products which are in this phase; and joint conversion of plutonium and uranium, which are available in water phase obtained after the third stage, to mixed uranium-plutonium oxide.

EFFECT: invention provides thee possibility of effective removal from uranium and plutonium of impurity of other chemical elements, as well as the possibility of obtaining mixed uranium-plutonium oxide which can be used for manufacture of MOX nuclear fuel.

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