G - Physics – 21 – C
Patent
G - Physics
21
C
359/78
G21C 3/34 (2006.01) G21C 3/356 (2006.01)
Patent
CA 1139459
ABSTRACT OF THE DISCLOSURE A novel spacer grid for a fuel assembly of the type that is employable in a nuclear reactor core and has a definable exterior surface. The fuel assembly comprises: a multiplicity of fuel rods and at least one nuclear fuel assembly spacer grid cooperatively associated with the fuel assembly, the nuclear fuel assembly spacer grid including perimeter means positioned in surrounding relation to the multiplicity of fuel rods. Spacer means is cooperatively associated with the fuel assembly, the spacer means including expandable means supported on the exterior surface of the fuel assembly, said expandable means being formed from a material having a relatively high coefficient of thermal expansion and being expandable between a first position wherein the expendable means is located in relatively close proximity to the exterior surface of the fuel assembly, and a second position wherein the expandable means is displaced laterally relative to the exterior surface of the fuel assembly so as to preclude in-reactor bowing of the fuel assembly by occupying the space adjacent to the exterior surface of the fuel assembly otherwise available for receiving portions of the fuel assembly that have undergone bowing.
346527
Abb Combustion Engineering Nuclear Power Inc.
Smart & Biggar
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