Nuclear reactor with bi-level core

Details Nuclear reactor with bi-level core Nuclear reactor with bi-level core

1990-07-10

1992-05-26

Hunt, Brooks H.

Induced nuclear reactions: processes, systems, and elements

Fuel component structure

Plural fuel segments or elements

376917, G21C 304

Patent

active

051165678

ABSTRACT:
A reactor core includes upper and lower matrices of fuel bundles. Fuel rods in the upper matrix have their plenums oriented upward, while fuel rods in the lower matrix have their plenums oriented downward. Refueling involves removal of a first bundle in the upper matrix, removal and retirement of the bundle in the lower matrix directly below the original position of the first bundle, inversion and installation of the first bundle in the lower matrix, and installlation of a new bundle in the upper matrix. The new bundle is installed plenum-side up. The bi-level core 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 using the disclosed core arrangement and refueling procedure.

REFERENCES:
patent: 3128235 (1964-04-01), Hackney et al.
patent: 3284310 (1963-12-01), Straat
patent: 4326922 (1982-04-01), Ferrari et al.

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