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, 1994
Filed:
Jul. 09, 1993
Akihiro Kato, Ibaraki, JP;
Kinichi Sugai, Ibaraki, JP;
Hiroaki Kadono, Ibaraki, JP;
Masaji Mori, Kobe, JP;
Yasunao Yamaguchi, Tokyo, JP;
Atsushi Baba, Kobe, JP;
Toshiyuki Kawagoe, Tokyo, JP;
Masahiko Imaizumi, Ibaraki, JP;
Mitsubishi Nuclear Fuel Co., Tokyo, JP;
Mitsubishi Genshiryoku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A grid structure is presented in which grid cells are formed by orthogonally intersecting straps prefitted in the longitudinal direction with a plurality of slitted spring frame members. Therefore, when the straps are assembled, the spring frame members are also orthogonally intersected. The spring frame members are made of Inconel and provided with welding tabs while the straps are made of zircalloy and provided with their own welding tabs. Therefore, welding can be performed to firmly join the spring frame members to each other while the straps can also be welded firmly to weld the like metals. The spring sections are thus firmly joined and attached to the straps which are firmly joined. The grid of this configuration thus provides an excellent service life without the losing The fuel rod retaining power, which would result from neutron radiation and thermal damages on holding devices made of zircalloy.