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:
Aug. 03, 2010
Filed:
Jun. 03, 2008
Atsushi Watanabe, Hitachiota, JP;
Yoichi Wada, Hitachinaka, JP;
Makoto Nagase, Mito, JP;
Kazushige Ishida, Hitachi, JP;
Hideyuki Hosokawa, Hitachinaka, JP;
Fumihito Hirokawa, Hitachi, JP;
Masaaki Tsubaki, Hitachi, JP;
Shiro Takahashi, Hitachi, JP;
Atsushi Watanabe, Hitachiota, JP;
Yoichi Wada, Hitachinaka, JP;
Makoto Nagase, Mito, JP;
Kazushige Ishida, Hitachi, JP;
Hideyuki Hosokawa, Hitachinaka, JP;
Fumihito Hirokawa, Hitachi, JP;
Masaaki Tsubaki, Hitachi, JP;
Shiro Takahashi, Hitachi, JP;
Hitachi-GE Nuclear Energy, Ltd., Ibaraki-ken, JP;
Abstract
A handling method for a natural circulation boiling water reactor having a chimney having cylindrical chimney shell disposed above a core in a reactor pressure vessel, a plurality of square tubes disposed in the chimney shell, and a grid support plate with grid holes supporting and in communication with a lower end portion of the square tubes so that adjacent square tubes are disposed at an interval which exceeds the width of one square tube between them. The method includes steps shifting predetermined ones of the square tubes to the interval between the square tubes, and performing maintenance and inspection of members around a core via the grid holes which appear at positions from which the predetermined square tubes are taken out due to the shift of the predetermined square tubes.