Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1993-06-22
1994-11-22
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376428, 376419, G21C 332
Patent
active
053675479
ABSTRACT:
A fuel assembly for a boiling water reactor comprising an upper and lower tie plates, a plurality of fuel rods filled therein with a plurality of fuel pellets, a fuel bundle comprising the fuel rods retained with a plurality of spacers in spaced relation and disposed between the upper and lower tie plates, and a polygonal tube-like channel box which encloses the fuel bundle and constitutes flow paths for coolant. The fuel rods comprise long fuel rods and short fuel rods which are each shorter in the effective portion than each of the long fuel rods. The concentration of fissile material in each of the short fuel rods is lower than the mean concentration of fissile material in the cross section of the fuel bundle. In the case the fuel bundle is vertically subdivided into two regions, an upper and lower one, with the upper end of the effective portion of each of the short fuel rods as a border, the mean concentration of fissile material in the cross section of the fuel bundle in the region lower than the border is lower than that in the cross section of the fuel bundle in the region above the border.
REFERENCES:
patent: H722 (1990-01-01), Sofer et al.
patent: 4629599 (1986-12-01), Crowther et al.
patent: 4968479 (1990-11-01), Ogiya et al.
patent: 5202085 (1993-04-01), Aoyama et al.
patent: 5219519 (1993-06-01), Matzner
Hida Kazuki
Hirano Yasushi
Hirukawa Koji
Nakajima Tsuyoshi
Chelliah Meena
Kabushiki Kaisha Toshiba
Walsh Donald P.
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