Uranium-containing nuclear-fuel sintered pellet

Details Uranium-containing nuclear-fuel sintered pellet Uranium-containing nuclear-fuel sintered pellet

1996-02-09

1997-06-24

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Encased with nonfuel component

252640, G21C 362

Patent

active

056423900

ABSTRACT:
A uranium-containing nuclear-fuel sintered pellet containing UO.sub.2, (U, Pu)O.sub.2, (U, Th)O.sub.2, (U, RE)O.sub.2, (U, Pu, Th)O.sub.2, (U, Pu, RE)O.sub.2, (U, Th, RE)O.sub.2 or (U, Pu, Th, RE)O.sub.2, wherein RE=rare earth, has a sintered-pellet surface layer being formed of at least 80% by volume of a chemical boron compound UB.sub.x or (U, . . . )B.sub.x, wherein x=2;4;6 or 12, and a remainder of the sintered pellet containing at most 5% by volume of the chemical boron compound. A nuclear-reactor fuel assembly has a fuel rod containing such a uranium-containing nuclear-fuel sintered pellet in a cladding tube with the boron as a burnable absorber for thermal neutrons. The surface layer having the chemical boron compound is obtained by treating the nuclear-fuel sintered pellet with boron or a boron-containing chemical compound at an appropriately high treatment temperature.

REFERENCES:
patent: 3427222 (1969-02-01), Biancheria et al.
patent: 4560575 (1985-12-01), Eisenstatt et al.
patent: 4683114 (1987-07-01), Ho et al.
patent: 4774051 (1988-09-01), Peehs et al.
Database INIS (IAEA) STN INIS Caesar Accession Number: 1232, AN--24 (11) : 39990 INIS, Nov. 1990.
Database INIS (IAEA) STN INIS Caesar Accession Number: 1236, AN--22 (6) : 23224 INIS, Sep. 1989.

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