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:
Mar. 15, 2011
Filed:
Feb. 28, 2007
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 natural circulation boiling water reactor provides to a chimney with a plurality of tubes. That is to say, each of the plurality of tubes partitions the coolant flow path above a core. Thus, unlike the conventional natural circulation boiling water reactor providing the flow path partition wall grid in which the plate members are made integral by welding and coolant flow paths are partitioned, the chimney of the natural circulation boiling water reactor can reduce the number of welded portions because the edges of the four corners of each flow path do not need to be welded. The natural circulation boiling water reactor can avoid removal as a single unit, as in the case of the flow path partition wall grid in the conventional natural circulation boiling water reactor, by detaching each tube. The chimney can be easily detached from the reactor pressure vessel.