Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within... – Fuel component
Patent
1990-01-03
1991-11-26
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
Fuel component
G21C 2100
Patent
active
050680811
ABSTRACT:
In a method of assembling a nuclear fuel assembly, a deflecting jig is inserted into grid cells in each of a plurality of grids. The diameter of the deflecting jig is enlarged to urge a spring of at least one pair of dimples and spring associated with the grid cell to deflect the spring away from the dimple. A plurality of elongated key members are inserted into the grid cells through a plurality of openings defined at intersections between the straps forming walls of the grid cells. Each key member is rotated about its axis to cause hooks of the key member to project from a wall surface of the strap in a direction opposite to the projecting direction of the springs. The key member is then moved in a direction to engage the hooks with the wall surface of the strap. Urging of the spring by the deflecting jig is released to allow the same to be withdrawn from the grid cells and, subsequently, the fuel rods are inserted into the respective grid cells. The key number is then moved in a direction to bring the springs into pressure contact with the fuel rods. The key members are then withdrawn from the grid cells.
REFERENCES:
patent: 3795040 (1974-03-01), Jabsen
patent: 3933583 (1976-01-01), Jabsen
patent: 3982994 (1976-09-01), Jabsen
patent: 4651403 (1987-03-01), DeMario et al.
patent: 4729867 (1988-03-01), DeMario
Inada Hitoshi
Kato Akihiro
Kawagoe Toshiyuki
Miyai Hiromasa
Mori Masaji
Mitsubishi Nuclear Fuel Co.
Wasil Daniel D.
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