Nuclear fuel assembly and core

Details Nuclear fuel assembly and core Nuclear fuel assembly and core

1993-09-16

1995-02-07

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

G21C 3328

Patent

active

053881320

ABSTRACT:
A mean uranium enrichment of fuel rods is set to not less than 4 wt% and preferably 4.25%, a percentage in number of Gd rods to all the fuel rods is set in the range of 20 to 30% and preferably 23%, and an enrichment 4.45 wt% of the Gd rods is between a pellet maximum uranium enrichment and a pellet minimum uranium enrichment. A percentage in number of those fuel rods having a maximum uranium enrichment of 5.0% to all the fuel rods except the Gd rods is set to not less than 75% and preferably 82%. A mean uranium enrichment in the enriched fuel section except blanket regions at upper and lower end portions is 4.75 wt% and a ratio e.sub.max /e.sub.mean of the pellet maximum uranium enrichment to that mean uranium enrichment is not larger than 1.16 and preferably 1.105. Accordingly, when the maximum uranium enrichment is limited to 5.0 wt%, the mean uranium enrichment can be raised to attain mean discharged exposure not less than 45 GWd/t without causing any problems in gadolinia containing fuel rods.

REFERENCES:
patent: 4926450 (1990-05-01), Masuhara et al.
patent: 5176877 (1993-01-01), Nakajima et al.
patent: 5198186 (1993-03-01), Ogiya et al.
patent: 5249211 (1993-09-01), Nagano et al.

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