Induced nuclear reactions: processes – systems – and elements – Nuclear transmutation – By neutron bombardment
Patent
1989-02-13
1992-08-04
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Nuclear transmutation
By neutron bombardment
376173, 376339, 376901, G21C 106, G21C 708
Patent
active
051366193
ABSTRACT:
A method and apparatus for improving the performance of a thermal breeder reactor having regions of higher than average moderator concentration are disclosed. The fuel modules of the reactor core contain at least two different types of fuel elements, a high enrichment fuel element and a low enrichment fuel element. The two types of fuel elements are arranged in the fuel module with the low enrichment fuel elements located between the high moderator regions and the high enrichment fuel elements. Preferably, shim rods made of a fertile material are provided in selective regions for controlling the reactivity of the reactor by movement of the shim rods into and out of the reactor core. The moderation of neutrons adjacent the high enrichment fuel elements is preferably minimized as by reducing the spacing of the high enrichment fuel elements and/or using a moderator having a reduced moderating effect.
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Capossela Harry J.
Dwyer Joseph R.
Luce Robert G.
McCoy Daniel F.
Merriman Floyd C.
Behrend Harvey E.
Constant Richard E.
Haight James C.
Moser William R.
The United States of America as represented by the United States
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