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:
Jan. 17, 1995
Filed:
Aug. 23, 1993
Robert B Macduff, Richland, WA (US);
Siemens Power Corporation, Richland, WA (US);
Abstract
A method is provided for retrofitting nuclear fuel assemblies in bottom entry fuel assembly type nuclear reactors having a transition piece to guide liquid coolant into a channel entry area. The transition piece is disposed above an entry orifice in a fuel assembly support plate. The transition piece has side walls and a multi-pronged lead-in finger. The method comprises the steps of removing the lead-in finger from the transition piece, machining internal surfaces of the side walls of the transition piece and installing an insert to be disposed within and supported by the machined transition piece. The insert has walls with internal surfaces defining a first cylindrical portion with a constant diameter at least as large as the diameter of the orifice and disposed immediately above the orifice for allowing the flow stream from the orifice to fully enter the first portion and attach to the inner sides of the first portion and an outwardly flaring (conical or parabolic) second portion having a diameter which increases in the direction of fluid flow for allowing controlled expansion of fluid in the transition piece.