METHOD OF PREPARING NUCLEAR FUEL PELLETS Russian patent published in 2010 - IPC G21C3/62 

FIELD: chemistry.

SUBSTANCE: when preparing suboxide-oxide the raw material used is in form of waste sintered pellets, grinding dust and UO₂ powder with content of U²³⁵, U²³⁶ and other uranium isotopes different from that required by technical specifications. When preparing the moulding powder, the obtained suboxide-oxide is added to the mixture in amount of up to 20 wt %, where the content of U²³⁵, U²³⁶ and other uranium isotopes required by technical specifications is achieved by varying the amount of adding the suboxide-oxide into the mixture separately, as well as in mixtures with UO₂ powder depending on content of U²³⁵, U²³⁶ and other uranium isotopes.

EFFECT: density which is close to normal, low open porosity and caking capacity, homogeneous microstructure of fuel pellets with uniform volume distribution of pores, controlled size and shape of pores.

3 cl, 1 tbl