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:
Apr. 09, 1991
Filed:
Mar. 28, 1988
Erik Jonsson, Vaster.ang.s, SE;
Lars Tornblom, Vaster.ang.s, SE;
AB Asea-Atom, Vaster.ang.s, SE;
Abstract
A sealing device for sealing a leak occurring inside a reactor pressure vessel at the vicinity of a weld between a control rod drive (CRD) tube and a surrounding CRD stub tube which communicates with an opening in the wall of the pressure vessel. An inner sealing sleeve of a soft metallic material and with an outer frusto-conical surface is fitted over the tube and the CRD stub tube, and an outer sealing sleeve of a hard metallic material and with an inner frusto-conical surface is fitted over the inner sealing sleeve. On each side of the crack special contact surfaces are formed between the inner sealing sleeve and the tube or the CRD stub tube. As the outer sealing sleeve is pressed in over the inner sealing sleeve, the inner sealing sleeve is pressed by the frusto-conical surfaces, moving against each other, against the tube and the CRD stub tube, thus providing sealing at the contact surfaces.