Geometrical instruments – Gauge – With calibration device or gauge for nuclear reactor element
Patent
1997-04-17
2000-02-22
Hirshfeld, Andrew
Geometrical instruments
Gauge
With calibration device or gauge for nuclear reactor element
33302, 335441, E21B 4708, G01B 2114, G01B 512
Patent
active
060265825
ABSTRACT:
Methods and apparatus for mapping pipe and valve bores in a reactor pressure vessel (RPV) of a nuclear reactor are described. In one embodiment of the apparatus, a main bar and an adjustable chuck facilitate positioning of a digital indicator inside a valve bore. In the one embodiment, the main bar is rotatably coupled to the chuck, and the chuck includes four movable jaws. A data acquisition element, which includes a digital indicator, is movably coupled to the main bar and configured to move substantially coaxially to the main bar. To map the circumference of the bore, the main bar and the chuck are inserted into the valve bore, and the chuck is used to center the main bar coaxially within the valve bore. The data acquisition element is positioned at a first location along the main bar, and the main bar is rotated so that the digital indicator maps the circumference of the bore. The data acquisition element is then moved to different locations along the main bar to map the circumference of the bore at different locations.
REFERENCES:
patent: 4521968 (1985-06-01), Wiltermood et al.
patent: 4571848 (1986-02-01), Kreutz et al.
patent: 4627168 (1986-12-01), Maples
patent: 4704801 (1987-11-01), Frizot et al.
patent: 5396712 (1995-03-01), Herzog
Donohue James C.
Kazirskis Benedict
General Electric Company
Hirshfeld Andrew
Smith R A.
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