Process for the production of block-shaped fuel elements for hig

Details Process for the production of block-shaped fuel elements for hig Process for the production of block-shaped fuel elements for hig

1977-02-14

1978-06-06

Nelson, Peter A.

Plastic and nonmetallic article shaping or treating: processes

Shaping or treating radioactive material

2523011S, G21C 338

Patent

active

040936821

ABSTRACT:
Block fuel element for high temperature reactors are produced by hot molding of a granulated graphite material consisting of natural graphite powder, synthetic graphite powder, phenolformaldehyde binder resin and stearic acid as a lubricant together with fissile and fertile coated fuel particles to a hexagonal block shape with cooling channels for helium gas and subsequent heat treatment of the molded block to a max. temperature of about 2000.degree. C. In order to displace the air from the die, an organic compound (air displacement agent) e.g., hydrocarbon, alcohol, phenol, aldehyde, ketone ether of amine is built into the granulated graphite material having a very low vapor pressure at room temperature which increases to about 760 Torr at molding temperature of about 180.degree. C and condensed into a liquid phase while the forming pressure is applied.

REFERENCES:
patent: 3310611 (1967-03-01), Zocher
patent: 3320178 (1967-05-01), Dewell
patent: 3329745 (1967-07-01), La Grange
patent: 3445437 (1967-10-01), Flack et al.
patent: 3708559 (1973-01-01), Voice et al.
patent: 3716605 (1973-02-01), Grimes et al.
patent: 3723581 (1973-03-01), Boettcher et al.
patent: 3812050 (1974-05-01), Steele

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