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:
Dec. 06, 1988
Filed:
Jul. 24, 1987
Yuichi Morimoto, Hitachi, JP;
Hiromi Maruyama, Katsuta, JP;
Motoo Aoyama, Hitachi, JP;
Atsushi Zukeran, Mito, JP;
Yasunori Bessho, Mito, JP;
Tomoyuki Matsumoto, Katsuta, JP;
Yoshihiko Ishii, Hitachi, JP;
Kouji Fujimura, Hitachi, JP;
Sadao Uchikawa, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A fuel assembly is composed of first fuel rods containing nuclear fuel material and burnable poison material and second fuel rods containing nuclear fuel material but no burnable poison material. The fuel assembly is charged in a high conversion area of a boiling water type nuclear reactor having a reactor core having the high conversion area and a burner area surrounding the high conversion area. A ratio V.sub.C /V.sub.F is not greater than 1.5 in the fuel assembly where V.sub.C is the volume occupied by coolant flow paths and V.sub.F is the volume occupied by the nuclear fuel material per unit length in an axial direction of the fuel assembly. In addition, the burnable poison material is composed of neutron absorption nuclides having at least one resonant energy in a neutron energy region of one electron volt or less.