METHOD OF PRODUCING FUEL COMPOSITIONS BASED ON URANIUM DIOXIDE WITH THE ADDITION OF A BURNABLE NEUTRON ABSORBER Russian patent published in 2020 - IPC G21C3/62 G21C21/02 C01G43/25 

FIELD: nuclear energy.

SUBSTANCE: invention relates to nuclear power engineering and can be used to produce coarse-grained fuel pellets of high nuclear purity with improved and controlled microstructure for heat-generating assemblies of nuclear reactors on thermal neutrons. Method involves mixing uranium dioxide powders and a burnable gadolinium oxide neutron absorber taken in amount of up to 8 wt%. Produced mix is pressed and sintered in vacuum at constant pressing pressure 60 MPa and ratio O/U=2 corresponding to its value in initial powder of uranium dioxide. Sintering is carried out by means of electric pulse heating to temperature 1,200–1,300 °C at rate of 100 °C/min and holding at the achieved maximum temperature for 4.5–5.5 minutes.

EFFECT: invention simplifies the method.

3 cl, 5 dwg