Method and device for measuring the diameter of a peripheral rod in a fuel assembly of a nuclear reactor
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United States of America Patent
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-
Apr 12, 2005
Grant Date -
Jul 24, 2003
app pub date -
Oct 25, 2002
filing date -
Apr 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The diameter of a segment of a peripheral rod in a fuel assembly is measured between two successive spacer grids. A measuring tool is positioned at a level situated between the two successive spacer grids, the tool comprising two measuring fingers that are free to move relative to each other in a first horizontal direction and that are urged towards each other by a resilient return arrangement, and that extend in a second horizontal direction perpendicular to the first horizontal direction. The measuring fingers are moved in the second horizontal direction towards a rod so as to put two contact pieces of the measuring fingers into contact with two zones of the rod segment. The measuring fingers are moved in the vertical axial direction of the rod along its segment situated between the two spacer grids and an electromagnetic sensor is used to measure the distance between the measuring fingers in the first horizontal direction while the measuring fingers are being moved axially.
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