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. 20, 1997
Filed:
Aug. 31, 1995
Hiroko Haraguchi, Hitachi, JP;
Yoshihiri Iwashita, Hitachi, JP;
Toshiro Yoshioka, Hitachi, JP;
Junichi Koyama, Hitachi, JP;
Akihiro Yamanaka, Hitachi, JP;
Mitsunari Nakamura, Hitachi, JP;
Katsumasa Haikawa, Jyuou-machi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In an initial core constituted by various kinds of fuel assemblies having a different average enrichment of uranium 235 four fuel assemblies having the lowest average enrichment constitute a square shaped cell. Three fuel assemblies having the highest average enrichment constitute an L-shaped cell, and the L-shaped cell is arranged at corners of the square shaped cells, whereby each assembly of the L-shaped cell adjoins a square shaped cell. The ratio of the number of assemblies of the L-shaped cell to the total number of fuel assemblies in the core is 10% or more.