NUCLEAR REACTOR PEBBLE Russian patent published in 2016 - IPC G21C3/62 C23C16/32 

FIELD: energy.

SUBSTANCE: invention relates to nuclear power, in particular, to nuclear reactor pebbles. Nuclear reactor pebble comprises a fuel microsphere based on oxide fuel and protective coating, including, from first from fuel microsphere, a low-density layer with thickness of 84-110 mcm, second dense layer with thickness of 30-36 mcm, third layer of silicon carbide and fourth high density layer with thickness of 36-42 mcm. All layers are made from silicon carbide, wherein first layer has density 0.9-1.2 g/cm³, second layer has density 2.5-2.9 g/cm³, third layer has density 1.5-2.2 g/cm³ and thickness of 7-13 mcm, and fourth layer has density 3.2-3.3 g/cm³.

EFFECT: technical result is production of a nuclear reactor pebble with longer life (higher fuel burnup depth) due to reduced pressure of gaseous fission products on protective layers.

1 cl, 5 dwg