METHOD OF PRODUCING PELLETED POROUS URANIUM DIOXIDE Russian patent published in 2019 - IPC G21C3/62 G21C21/02 C01G43/25 

FIELD: physics.

SUBSTANCE: invention relates to nuclear power engineering and can be used to obtain pellets of uranium dioxide fuel cores of high-temperature ventilated fuel elements primarily thermionic reactors-converters of built-in version. Method of producing pelleted porous uranium dioxide involves preparing a charge from uranium dioxide starting powder with addition of binder and volatile pore-forming substance in form of a mixture of granules with a fractional size in range of 20 to 60 mcm in amount of 10–20 % of the weight of the uranium dioxide powder, pellets pressing and sintering in high-temperature vacuum furnace at 1900 ± 20 °C, at residual medium pressure 5⋅10^-5 mm Hg. for four hours.

EFFECT: invention enables to ensure optimum microstructure formation in the fuel cores of high-temperature ventilated fuel elements in the initial period of operation of thermionic reactor-converters.

1 cl, 3 dwg