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. 03, 2012
Filed:
Jan. 24, 2008
Takayuki Arakawa, Hitachi, JP;
Koichi Machida, Hitachi, JP;
Norio Kawashima, Mito, JP;
Kazuki Kobayashi, Hitachi, JP;
Yoshiharu Kikuchi, Hitachi, JP;
Takayuki Arakawa, Hitachi, JP;
Koichi Machida, Hitachi, JP;
Norio Kawashima, Mito, JP;
Kazuki Kobayashi, Hitachi, JP;
Yoshiharu Kikuchi, Hitachi, JP;
Hitachi-GE Nuclear Energy, Ltd., Ibaraki, JP;
Abstract
A control rod includes a tie-rod, a handle mounted to an upper end portion of the tie-rod, either a connector plate or a fall velocity limiter mounted to a lower end portion of the tie-rod, sheaths having a U-shaped cross-section, welded intermittently to the tie-rod at a plurality of locations in the axial direction of the tie-rod, and having an upper end welded to the handle and a lower end welded to either the connector plate or the fall velocity limiter, and a neutron absorbing member disposed inside each of the sheaths. An upper end of a weld portion located at uppermost position in an axial direction of the tie-rod among a plurality of weld portions between the tie-rod and the sheath is disposed at a position within a range between 0.8 and 13% of total axial length Ls of the sheath below an upper end of the sheath.