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. 03, 1979
Filed:
Jun. 28, 1977
Kazuyoshi Miki, Kawasaki, JP;
Hitachi, Ltd., , JP;
Abstract
This invention relates to fuel assembly for Fast Breeder Reactor, such as wire spacer fuel assembly, in which the thickness of cladding tubes in the upper end portion of fuel pins positioned in the peripheral region of the assembly is made larger than that of the remaining portion. Thus, according to the present invention, a bundle of the fuel pins can be restrained from displacement in one direction in the assembly when the fuel pins are deformed by heat and neutron radiation in operation of a nuclear reactor, and further the sectional portion of the fuel pins can be prevented from deformation caused by a load externally operated on the fuel pins. Furthermore, the thickness of the cladding tubes can be prevented from reduction caused by fretting corrosion which is caused by the contact of the cladding tubes with a wrapper tube.