Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Encased with nonfuel component
Patent
1988-11-07
1991-04-16
Lechert,, Jr.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Encased with nonfuel component
376428, 376444, G21C 300
Patent
active
050080709
ABSTRACT:
A fuel assembly has a plurality of first fuel rods each of which contains nuclear fuel material but does not contain burnable poison, and a plurality of second fuel rods each of which includes nuclear fuel material and burnable poison. The amount of burnable poison in a lower region of the fuel assembly is smaller than that in an upper region thereof. When each of the second fuel rods is divided into an upper region and a lower region, a region of the divided regions in the second fuel rods containing a maximum burnable poison concentration Gmax and a region of the divided regions in the second fuel rods containing a minimum burnable poison concentration Gmin are located in the lower region of the fuel assembly. The burnable poison concentration of the upper region of each second fuel rod is between Gmax and Gmin. The fuel assembly may moderate a maximum linear heat rating with an increased spectral shift effect.
REFERENCES:
patent: 4280874 (1981-07-01), Kawai et al.
patent: 4324615 (1982-04-01), Kobayashi et al.
patent: 4652427 (1987-03-01), Uchikawa et al.
patent: 4683113 (1987-07-01), Mochida et al.
patent: 4832906 (1989-05-01), Aoyama et al.
Aoyama Motoo
Bessho Yasunori
Koyama Junichi
Maruyama Hiromi
Nakajima Akinobu
Bhat Nina
Hitachi , Ltd.
Lechert Jr.
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