FIELD: physics.
SUBSTANCE: method comprises separating nuclear fuel material containing thorium metal and processing an oxide of the nuclear fuel material in a reactor (1), containing thorium oxide in spent fuel, placed in a bin (3a). The disclosed method includes a first step for electrolytic reduction of thorium oxide, which includes applying electrode potential across an anode (2) and a cathode (3) in a first melt of alkali-earth metal halides, a first step of washing the reduction product and a main step for electrolytic separation of the reduction product. The first melt of halides further includes an alkali metal halide and at least one of the substances: calcium chloride, magnesium chloride, calcium fluoride and magnesium fluoride. The disclosed method can further include a second for electrolytic reduction of uranium oxide, plutonium oxide and light actinide oxides in a second melt of alkali metal halides.
EFFECT: selective separation of thorium metal from spent nuclear fuel material containing thorium oxide.
16 cl, 9 dwg
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