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:
Aug. 09, 1994
Filed:
Mar. 25, 1992
Motoo Aoyama, Mito, JP;
Ryoji Masumi, Hitachi, JP;
Yooko Ishibashi, Hitachiota, JP;
Kunitoshi Kurihara, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A fuel assembly comprising a plurality of fuel rods, where fuel rods containing a burnable poison element having a smaller neutron absorption cross-section such as boron are provided in a region of soft neutron energy spectrum and a large thermal neutron flux and fuel rods containing a burnable poison element having a larger neutron absorption cross-section such as gadolinium and fuel rods containing no such burnable poison element are provided in other region of average neutron energy spectrum, has a flat fuel rod power distribution throughout the fuel lifetime even against substantially uniform uranium enrichment distribution with reduced parasitic neutron absorption by gadolia, that is, with higher burnup and reduced fuel cycle cost.