Coated nuclear fuel particles and process for making the same

Details Coated nuclear fuel particles and process for making the same Coated nuclear fuel particles and process for making the same

1974-01-07

1976-11-16

Jordan, Charles T.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

176 82, 176 91SP, 264 5, G21C 302

Patent

active

039922588

ABSTRACT:
An improved nuclear fuel particle comprises (a) a generally spherical low density kernel of a fissile element having a void volume of at least 40 percent of the physical volume of the kernel in order to accommodate fission gases generated during the use of the fuel particle, (b) the kernel is coated over its entire surface with an extremely thin carbon buffer layer to provide for fission recoil, and (c) thin pyrolytic carbon, (d) silicon carbide and (e) outer pyrolytic carbon layers are superimposed thereon to hermetically seal the kernel to prevent escape of generated fission gases, the pyrolytic carbon and silicon carbide layers being of sufficient strength to resist rupture of the pressure of the contained fission gases even at high reactor temperatures of the order of 1000.degree. C-1300.degree. C and a burn up of 50 percent or more FIMA. Such particles can be embedded in graphitic bodies to provide fuel elements having a greatly increased fuel loading per unit volume of particle and fuel element. Processes for producing such improved fuel particles are also disclosed.

REFERENCES:
patent: 3298921 (1967-01-01), Bokros et al.
patent: 3335063 (1967-08-01), Goeddel et al.
patent: 3361638 (1968-01-01), Bokros et al.
patent: 3649452 (1972-03-01), Chin et al.
patent: 3650896 (1972-03-01), Goeddel
patent: 3798123 (1974-03-01), Lindemer

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