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:
Jun. 14, 1988
Filed:
Apr. 22, 1987
Alain Delevallee, Ecully, FR;
Francis Lagarrigue, Sainte Foy les Lyon, FR;
Framatome, Courbevoie, FR;
Abstract
A spacer sleeve is installed within an instrumentation tube of a nuclear fuel assembly comprising two end nozzles connected by tie rods and a plurality of fuel rod supporting grids distributed at axial intervals along the tie rods. The instrumentation tube has a first end received in an initially blind bore formed in one of the end nozzles and communicating with the outside by a coolant restriction. An opening having a diameter equal to that of said sleeve and connected to the bore by a shoulder is machined in the end nozzles; a sleeve is inserted into the instrumentation tube through the opening; the sleeve is centered within said instrumentation tube by locally expanding it into contact with the instrumentation tube at a plurality of locations each in one of said intervals; a cap is introduced into the sleeve having a radial end collar dimensioned for abutting connection against said sleeve, a deformable lateral skirt and a bottom wall formed with a coolant flow orifice of predetermined cross-sectional area; and the sleeve is secured within the nozzle by simultaneously expanding radially the skirt and the sleeve against the shoulder.