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. 26, 1994
Filed:
Jul. 24, 1992
Hitachi, Ltd., Tokyo, JP;
Abstract
In a fuel loading method for a reactor core made up by high burn-up fuel, fuel assemblies loaded in a circumferential zone of the core are shuffled between two layers of the circumferential zone until residing in the core for two cycles and, after residing for two cycles, are moved to the fourth layer of the circumferential zone from an outermost layer of the core, thereby reducing the difference in exposure due to a different radial power level in the vicinity of the core boundary. Those fuel assemblies are moved to control cells in a central zone of the core after residing in the circumferential zone for three cycles, and also such fuel assemblies as having resided in the central zone for three cycles are moved to the core outermost layer, thereby reducing the difference in exposure between the fuel assemblies having resided in the central zone and the fuel assemblies having resided in the circumferential zone due to different power levels in the central and circumferential zones. As a result, the difference in exposure between used fuel assemblies is reduced.