Abstract
Considerable attention has centered in recent years on the development of electrochemical methods of stabilizing the valence forms of uranium, plutonium, and neptunium in the extraction processes for reproducing spent nuclear power-plant fuel, primarily with a view to a reduction in the volumes of liquid radioactive wastes and their solute content. In this paper are set out the results of a study of the electrochemical reduction of Pu(VI) to Pu(IV) in aqueous nitric acid solutions under the effect of ionizing radiation in the presence of uranium and certain fission products (palladium, ruthenium, and technetium). The research was carried out in a temperature-controlled electrochemical cell with a titanium cathode and a platinum anode and no division between the electrode compartments. The design of the cell made it possible to expose the solutions to a beam of electrons accelerated to an energy of 3 MeV, thus producing an absorbed dose rate of 20 Gy/sec.
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