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:
Jan. 25, 1994
Filed:
Feb. 12, 1992
Masaru Ukai, Kawasaki, JP;
Hideaki Okami, Chigasaki, JP;
Kozo Sato, Yokohama, JP;
Kazuya Okamoto, Yono, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A gap between adjoining fuel rods arranged in a fuel assembly is measured by setting a measuring device into a fluid such as cooling water or a specific gas such as CF filling a container, placing a fuel assembly to be inspected to a predetermined portion the container, measuring a distribution of the fluid distributed in the fuel assembly by utilizing a nuclear magnetic resonance imaging system, and measuring the gap in accordance with the fluid distribution as an image. The measuring device includes a magnet unit and a coil unit for generating magnetic fields, and the coil unit includes a coil assembly for generating gradient magnetic fields and a coil assembly for generating a high-frequency magnetic field and detecting a nuclear magnetic resonance signal. The gap measuring apparatus utilizing nuclear magnetic resonance further includes a controlling device for controlling the magnetic fields generated by the magnet unit and the coil assemblies and a data processor for carrying out data processing in response to a signal transmitted from the controlling device, wherein the distribution of the fluid in the fuel assembly is processed as a sectional image of the fuel assembly to thereby measure the gaps between adjoining fuel rods or between the fuel rod and the water rod.