Bi-level fuel management method for boiling-water nuclear reacto

Details Bi-level fuel management method for boiling-water nuclear reacto Bi-level fuel management method for boiling-water nuclear reacto

1991-12-09

1993-04-20

Walsh, Donald P.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

Fuel component

376433, 376370, G21C 1900

Patent

active

052040534

ABSTRACT:
Fuel management in a boiling-water nuclear reactor involves arranging fuel bundles in upper and lower matrices of the reactor core. During a refueling operation, some bundles in the upper matrix are removed and retired, while fresh bundles are inserted in the lower matrix and some bundles originally in the lower matrix are transferred to the upper matrix. In the transfer, fuel bundles are inverted so that included fuel rods in the lower matrix have their plenums oriented downward, while fuel rods in the upper matrix have their plenums oriented upward. This method provides greater flexibility in repositioning fuel bundles for longer burnups and lower high-level waste. In particular, problems with axial spectral variations in neutron flux can be compensated for using the disclosed refueling procedure.

REFERENCES:
patent: 3128235 (1964-04-01), Hackney et al.
patent: 3284310 (1966-11-01), Straat
patent: 4326922 (1982-04-01), Ferrari et al.

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