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:
Jul. 11, 1995
Filed:
Dec. 23, 1992
Motoo Aoyama, Mito, JP;
Taro Ueki, Ann Arber, MI (US);
Akinobu Nakajima, Hitachi, JP;
Yoko Ishibashi, Hitachiohta, JP;
Kunitoshi Kurihara, Katsuta, JP;
Osamu Yokomizo, Ibaraki, JP;
Yasuhiro Masuhara, Katsuta, JP;
Junichi Yamashita, Hitachi, JP;
Yasunori Bessho, Mito, JP;
Junjiro Nakajima, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A fuel assembly comprises fuel rods arrayed in a square lattice pattern of 10 rows and 10 columns, and three large-diameter water rods arranged along a diagonal line of the fuel assembly in such a region as able to accommodate 10 fuel rods. Partial length fuel rods are arranged in an outermost layer of the fuel rod array at fuel rod setting positions other than corners of the outermost layer. Ordinary fuel rods are arranged in a layer inside the outermost layer and adjacent to the outermost layer at positions adjacent to the partial length fuel rods in the outermost layer. The struction of the fuel assembly enables a reduction in the void coefficient and an improvement in the reactivity control capability. Also, the void coefficient can be reduced without lowering reactivity, and fuel economy is improved.