Work holders – Relatively movable jaws – Jaw features
Patent
1975-03-28
1977-11-15
Werner, Frank E.
Work holders
Relatively movable jaws
Jaw features
176 19R, 214130R, 269 55, B65G 700
Patent
active
040582248
ABSTRACT:
An illustrative embodiment of the invention discloses a technique for disassembling a nuclear reactor fuel element without destroying the individual fuel pins and other structural components from which the element is assembled. A traveling bridge and trolley that span a water-filled spent fuel storage pool support a strongback. The strongback is under water and provides a working surface on which the spent fuel element is placed for inspection and for the manipulation that is associated with disassembly and assembly. To remove, in a non-destructive manner, the grids that hold the fuel pins in the proper relative positions within the element, bars are inserted through apertures in the grids with the aid of special tools. These bars are rotated to flex the adjacent grid walls and, in this way relax the physical engagement between protruding portions of the grid walls and the associated fuel pins. With the grid structure so flexed to relax the physical grip on the indiviudal fuel pins, these pins can be withdrawn for inspection or replacement as necessary without imposing a need to destroy fuel element components.
REFERENCES:
patent: 2338285 (1944-01-01), Harry
Maguire Joseph M.
Notaro Angelo
Sinnott John P.
The Babcock & Wilcox Company
Werner Frank E.
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