Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor...
Patent
1992-02-12
1994-01-25
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
376247, 376261, G21C 1700
Patent
active
052822290
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.
REFERENCES:
patent: 4152638 (1979-05-01), Kruger
patent: 4259638 (1981-03-01), Krueger
patent: 4576777 (1986-03-01), Weber
patent: 4816207 (1989-03-01), Scharpenberg
patent: 5070622 (1991-12-01), Butzin et al.
Okami Hideaki
Okamoto Kazuya
Sato Kozo
Ukai Masaru
Chelliah Meena
Kabushiki Kaisha Toshiba
Walsh Donald P.
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