METHOD OF MAKING NUCLEAR REACTOR MICROFUEL RODS Russian patent published in 2016 - IPC G21C3/28 G21C21/02 

FIELD: nuclear energy.

SUBSTANCE: invention relates to production of microfuel rods of nuclear reactor. Method of making microfuel rods involves successive deposition on fuel microspheres of gas mixture by pyrolysis in a fluidized bed of protective coating layers. Low-density pyrocarbon layer is deposited by pyrolysis of mixture of acetylene and argon, intermediate and outer layers of high-density isotropic pyrocarbon is deposited by pyrolysis of gas mixtures, consisting of 26.0 vol. % of acetylene, 22.0 vol. % of propylene and 52.0 vol. % of argon, power silicon carbide layer is deposited on intermediate layer of high-density isotropic pyrocarbon. Wherein layer of silicon carbide is deposited on fuel microspheres, which is oxygen getter, by pyrolysis of 96 vol. % of argon and 4 vol. % methylsilane, low-density pyrocarbon layer is deposited by pyrolysis of acetylene with concentration of 55-65 vol. % in mixture with argon, and power silicon carbide layer is deposited from mixture of gases: 8.5-9.5 vol. % of methyltrichlorosilane, 0.5 vol. % of propylene, rest is 90-91 vol. % of hydrogen.

EFFECT: technical result is reduction of process duration and consumption of gases for pyrolysis, increased service life of fuel microspheres.

3 cl, 2 dwg, 1 tbl