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. 25, 1989
Filed:
Nov. 20, 1987
Renzo Takeda, Hitachi, JP;
Kanji Kato, Katsuta, JP;
Tadahiro Ohnishi, Hitachi, JP;
Sadao Uchikawa, Katsuta, JP;
Hiromi Maruyama, Katsuta, JP;
Motoo Aoyama, Hitachi, JP;
Kikuo Umegaki, Hitachi, JP;
Yasunori Bessho, Hitachi, JP;
Motomasa Fuse, Hitachi, JP;
Michiro Yokomi, Ibaraki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a light water moderation type nuclear reactor with the once-through method, the reactor core is divided into a central area and a peripheral area by a partition member, a first fuel assembly is arranged in the central area (high conversion area) and a second fuel assembly is arranged in the peripheral area. The ratio (r.sub.H/U) of the number of hydrogen atoms to that of uranium atoms in the central area is smaller than that of the ratio in the peripheral area and the second fuel assembly in the peripheral area is formed of fuel rods of the first fuel assembly having been previously burned in the central area and moved into the peripheral area. The plutonium production increases and uranium consumption is reduced during the first half of the lifetime of the fuel rods in the high conversion area with the take-up burn up increasing during the second half of the lifetime of the fuel rods in the burner area.