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. 21, 1993
Filed:
Sep. 17, 1991
Tadashi Fujii, Hitachi, JP;
Yoshiyuki Kataoka, Ibaraki, JP;
Tohru Fukui, Hitachi, JP;
Masataka Hidaka, Hitachi, JP;
Toshitsugu Nakao, Hitachi, JP;
Shigeo Hatamiya, Hitachi, JP;
Hiroaki Suzuki, Hitachi, JP;
Masanori Naitoh, Hitachi, JP;
Isao Sumida, Ibaraki, JP;
Kenji Tominaga, Hitachi, JP;
Tsuyoshi Niino, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is disclosed a nuclear reactor installation. An accumulator-type emergency core cooling system, a gravity-driven core cooling system and an equalizing system for submerging a reactor core are provided within a primary containment vessel containing a reactor pressure vessel in which the reactor core is disposed. These cooling systems are automatically operated sequentially in accordance with the pressure in the reactor pressure vessel without the need for any particular powered source. The primary containment vessel is made of steel, and the interior of this containment vessel is divided into a space containing the reactor pressure vessel and a space containing an operation floor in such a manner that the two spaces are isolated from each other. An opening device is provided between the two spaces so as to communicate the two spaces with each other in the event of an accident, the upper portion of the primary containment vessel being air-cooled while the lower portion of this containment vessel being water-cooled.