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. 10, 2018
Filed:
Dec. 24, 2013
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Tsuyoshi Nishimura, Tokyo, JP;
Takeshi Yamamoto, Tokyo, JP;
Hideshi Sakashita, Tokyo, JP;
Kensuke Tsuboi, Tokyo, JP;
Tomonobu Sato, Tokyo, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A nozzle repair method and a nuclear reactor vessel include: removing a trepanning portion () as a connection portion with respect to an in-core instrumentation cylinder () in a groove-welding portion (); removing the in-core instrumentation cylinder () from a semi-spherical portion () as a lower end plate; forming a surface buttered-welding portion () by buttered-welding the surface of the groove-welding portion (); forming a welding groove () by grooving the surface buttered-welding portion (); inserting a new in-core instrumentation cylinder (A) provided with a circumferential groove portion () outside an instrumentation equipment guide passage () into an attachment hole (); and fixing the new in-core instrumentation cylinder (A) by groove-welding the welding groove (). Accordingly, since the nozzle welding area is suppressed to a predetermined range, the workability of the repair is improved.