Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1990-02-28
1992-03-10
Hunt, Brooks H.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376435, G21C 334
Patent
active
050948059
ABSTRACT:
A fuel assembly for a pressurized water reactor includes fuel assembly edges and a fuel assembly interior. A bundle of mutually parallel fuel rods with cladding tubes each contain nuclear fuel. A given number of guide tubes are provided for control rods. A support structure includes an upper end with a fuel assembly head, a lower end with a fuel assembly foot, and a plurality of spacers disposed perpendicular to the fuel rods. The spacers have a uniform grid structure with edge meshes formed therein at the fuel assembly edges and inner meshes formed therein in the fuel assembly interior. Each of the inner meshes are surrounded by four respective immediately adjacent meshes each having the same area and each containing a respective one of the guide or cladding tubes or an instrumentation tube. At least one of the four meshes immediately adjacent each given inner mesh with a guide tube, contains a fuel rod cladding tube with a periphery being closer to the guide tube than the fuel rod cladding tubes in the remainder of the four meshes. The cladding tube of the fuel rod in the at least one mesh immediately adjacent the given inner mesh with a guide tube, may have a larger outside diameter than a fuel rod in an edge mesh and/or it may have a central axis being closer to the guide tube than the center of the at least one mesh.
REFERENCES:
patent: 3607640 (1971-09-01), Krawiec
patent: 4057466 (1977-11-01), Thompson et al.
patent: 4059484 (1977-11-01), Bupp et al.
patent: 4708845 (1987-11-01), Mildrum
patent: 4783308 (1988-11-01), Taleyarkhan
Holley Heinz-Peter
Schricker Wolfgang
Suchy Peter
Chelliah Meena
Greenberg Laurence A.
Hunt Brooks H.
Lerner Herbert L.
Siemens Aktiengesellschaft
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