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:
May. 04, 1993
Filed:
Mar. 20, 1990
Junichi Koyama, Hitachi, JP;
Motoo Aoyama, Mito, JP;
Akinobu Nakajima, Hitachi, JP;
Yasunori Bessho, Mito, JP;
Junichi Yamashita, Hitachi, JP;
Sadao Uchikawa, Katsuta, JP;
Hiromi Maruyama, Katsuta, JP;
Michihiro Ozawa, Hitachi, JP;
Mitsunari Nakamura, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A nuclear fuel assembly has an array of fuel rods comprising a plurality of first fuel rods each containing nuclear fuel material but not containing burnable poison and a plurality of further fuel rods each containing both nuclear fuel material and burnable poison. The further fuel rods comprise second fuel rods and third fuel rods, and each second fuel rod has at a lower region of the fuel assembly a burnable poison concentration which is a minimum burnable poison concentration in the further fuel rods. To increase the effectiveness of the second fuel rods in controlling axial power peaking, as seen in plan view on the array, the first fuel rods are the nearest neighbors of each further fuel rod.