The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1998
Filed:
Feb. 20, 1997
Mitsuaki Shimamura, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
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.