Induced nuclear reactions: processes – systems – and elements – Handling of fission reactor component structure within...
Patent
1997-02-20
1998-11-17
Jordan, Charles
Induced nuclear reactions: processes, systems, and elements
Handling of fission reactor component structure within...
376248, 376249, 348 83, G21C 1900, G21C 1708, H04N 718
Patent
active
058387528
ABSTRACT:
At a reactor bottom, varieties of work are performed by a working apparatus, the work includes inspecting, cleaning and recovering radioactive corrosion products and other foreign matters deposited or stuck onto a foot mirror of a reactor pressure vessel in a light-water cooling reactor, and cutting, grinding and welding structural members in relation to the foreign matters. The working apparatus includes a body case having a shape of a vertically long tube, having an opening formed in a peripheral surface thereof. The body case being suspended from above the reactor pressure vessel to be installed over an upper end of a control rod driving mechanism housing which is vacant after withdrawal of a control rod driving mechanism from the housing. The working apparatus further includes a turning mechanism for turning the body case about an axis thereof and setting a direction of the opening of the case body, working means housed in the body case, a developing mechanism for projecting and retracting the working means laterally outward through the opening with respect to the body case, a lifting mechanism for moving the working means up and down with respect to the body case, and a transfer mechanism for three-dimensionally transferring the working means, which has been descended by the lifting mechanism, along an upper surface of the foot mirror.
REFERENCES:
patent: 4302772 (1981-11-01), Gillot
patent: 4424531 (1984-01-01), Elter et al.
patent: 4650634 (1987-03-01), Meushcke et al.
patent: 5028379 (1991-07-01), Faulstich
patent: 5604532 (1997-02-01), Tillmanns
Jordan Charles
Kabushiki Kaisha Toshiba
Lattig Matthew J.
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