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, 2016
Filed:
Jul. 30, 2007
Daisuke Sato, Tokyo, JP;
Makoto Nakano, Tokyo, JP;
Jun Kimura, Kobe, JP;
MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo, JP;
Abstract
A moderator temperature coefficient measurement apparatus includes: an input section receiving plant data including a coolant temperature signal being time series data on a temperature of a coolant of a light water reactor, and a reactivity signal indicating time series data on a reactivity calculated based on a detection value of a neutron flux in the light water reactor; a singular value decomposition section decomposing the coolant temperature signal into N components T'(t) to T′N (t), and the reactivity signal into M components ρ′(t) to ρ′M (t) by a singular value decomposition method; a combination section generating a selected combination being a combination of T′i (t) selected from the N components T′(t) to T′N (t) and ρ′j (t) selected from the M components ρ′(t) to ρ′M (t); and a temperature coefficient calculation section calculating a moderator temperature coefficient based on auto and cross power spectral density functions obtained by applying a Fourier transformation to the selected combination. The moderator temperature coefficients can be detected at high precision without changing states of the plant.