Fuel-assembly inversion for dual-phase nuclear reactors

Details Fuel-assembly inversion for dual-phase nuclear reactors Fuel-assembly inversion for dual-phase nuclear reactors

1991-06-03

1992-09-01

Hunt, Brooks H.

Induced nuclear reactions: processes, systems, and elements

Handling of fission reactor component structure within...

Fuel component

376435, G21C 1900

Patent

active

051436906

ABSTRACT:
Fuel assemblies of a boiling-water nuclear reactor are inverted during refueling methods. Assemblies burned in a first orientation are subjected to greater burnup near their bottoms and greater conversion of fertile fuel to fissile fuel near their tops. Inverting the assemblies promotes burnup of the actinide products from the conversion of the last cycle. Thus, the procedure greater energy production efficiency and reduced actinide radioactive waste are achieved. One inverted fuel assemblies can be removed for disposal. Alternatively, they can be reinverted to burnup actinide fissile fuel generated at the bottom (while it was downstream of the top) during the second operating cycle. Further inversions are provided for, but the major gains occur during the first and second inversions.

REFERENCES:
patent: 4631166 (1986-12-01), Camden
patent: 4655995 (1987-04-01), Freeman et al.
patent: 4767595 (1988-08-01), Wolters et al.

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