Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Encased with nonfuel component
Patent
1985-05-16
1987-07-28
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Encased with nonfuel component
376428, 376435, 376447, G21C 300
Patent
active
046831134
ABSTRACT:
A nuclear fuel assembly has a plurality of fuel rods each containing a multiplicity of fuel pellets. The fuel rods include a plurality of first fuel rods and a plurality of second fuel rods. Each of the first fuel rods contains a burnable poison over substantially the entire axial length thereof. The first fuel rod also has a greater means enrichment in the upper axial region thereof than that in the lower axial region thereof. Each of the second fuel rods contains no burnable poison and has a uniform enrichment distribution over substantially the entire axial length thereof. In each cross-section of the fuel assembly perpendicular to the axis thereof, the outer peripheral portion has a greater mean enrichment than the central portion. The first fuel rods are disposed in the peripheral portion except the outermost peripheral portion of the cross-section of the fuel assembly.
REFERENCES:
patent: 3799839 (1974-03-01), Fischer
patent: 4229258 (1980-10-01), Takeda
Mochida Takaaki
Ozawa Michihiro
Yamashita Jun-ichi
Yoshioka Toshiro
Hitachi , Ltd.
Hitachi Engineering Co. Ltd.
Walsh Donald P.
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