Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within...
Patent
1992-12-17
1994-04-19
Wasil, Daniel D.
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
474206, G21C 1900, F16G 1300
Patent
active
053053583
ABSTRACT:
An apparatus and method for removing and installing a control rod drive includes a first chain and a second chain. Each chain has a plurality of links, which have a pivotable portion and a rigid portion, for allowing the first chain to bend in a single direction and the second chain to bend in a single direction. The rigid portion of the second chain is positioned adjacent to and contacts the rigid portion of the first chain for providing a rigid column. An end block retains the first ends of the first and second chains and a drive mechanism draws the first and second chains through the drive mechanism, for moving the control rod drive. The control rod drive handling equipment may also include at least one first, at least one second, and at least one third chain guide for supporting the first and second chains, at least one wheel attached to the second chain guide, and a plurality of pins positioned through apertures of adjacently positioned links of the first and the second chains. The method may include introducing the first and the second chains through an access hole in the vessel support structure of a boiling water reactor and moving the control rod drive handling equipment along a track positioned in an undervessel area of the reactor for aligning the control rod drive handling equipment with a control rod drive.
REFERENCES:
patent: 4288290 (1981-09-01), Saima et al.
patent: 4984952 (1991-01-01), Reuter
patent: 5156574 (1992-10-01), Gai
patent: 5203746 (1993-04-01), Lehnert
Addessi Aileen C.
Jarosik G. R.
Wasil Daniel D.
Westinghouse Electric Corp.
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