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:
Sep. 28, 1982
Filed:
Mar. 12, 1980
Yuuji Hashimoto, Hiroshima, JP;
Izumi Kobayashi, Higashikurume, JP;
Mitsuo Suzuki, Yokohama, JP;
Kimio Yamada, Hitachi, JP;
Shigeru Izumi, Tokyo, JP;
Yoshihiro Michiguchi, Ibaraki, JP;
The Chubu Electric Power Co., Inc., Tokyo, JP;
The Chugoku Electric Power Co., Inc., Tokyo, JP;
The Tokyo Electric Power Co., Inc., Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A number of sound detectors are provided on an external enclosure of a pressure vessel of a nuclear reactor. Output signals produced from the individual detectors are combined into a pattern in terms of time difference of the detector output signals relative to the time point at which the detected signal is first produced in response to the sound signal and relative peak values of the detector output signals relative to the magnitude of the output signal produced by the detector which detects the sound signal with the highest sensitivity. The pattern thus obtained is then compared with patterns which have been previously prepared by intentionally producing the sound signals at locations in interest within the pressure vessel, to thereby estimate the location within the pressure vessel at which the sound is produced.