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. 14, 1993
Filed:
May. 11, 1992
Mamoru Nagano, Kanagawa, JP;
Hisao Nogiwa, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A core construction for boiling water nuclear reactor in which a multiplicity of core units each having four fuel assemblies disposed in a square pattern adjacent to a control rod are arranged to form a reactor core, wherein the reactor core comprises control cells comprising four fuel assemblies which have been in the core more than three cyclic periods. The fuel assemblies located in the outer peripheral portion of the core are fuel assemblies which have been in the core more than three cyclic periods. Most of the core units comprise four fuel assemblies of first-, second-, third- or fourth-burning cyclic periods. The core is rotationally symmetric by 90 degrees. The core can be divided into four identical 1/4 cores by two vertical planes passing axial center lines of the core. Each of the 1/4 cores is substantially mirror symmetric about a plane passing the axial center line of the core.