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Eddy current workpiece positioning apparatus

Patent ·
OSTI ID:6496510
;
A sludge lance nozzle for removing sludge from between the tubes of a nuclear steam generator includes positioning apparatus mounted on top of the nozzle. The positioning apparatus includes a cylindrical eddy-current sensor mounted inside a cup-shaped non-magnetic electrically insulating spacer, which is in turn mounted in a cup-shaped support member fixedly secured to the nozzle. The tubes are arranged in rows and columns with the axes of the tubes in each column lying in a common column plane. The nozzle is moved perpendicular to the column planes close to one of the rows of tubes. The sensor produces a maximum-amplitude output signal when the sensing axis is coplanar with the column plane of a tube in the closest row of tubes and a minimum-amplitude output signal when the sensing axis is midway between adjacent tubes in the closest row of tubes.
Assignee:
Westinghouse Electric Corp.
Patent Number(s):
US 4526135
OSTI ID:
6496510
Country of Publication:
United States
Language:
English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
BOILERS
CLEANING
CURRENTS
EDDY CURRENTS
ELECTRIC CURRENTS
NOZZLES
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POSITIONING
POWER PLANTS
REMOVAL
SLUDGES
STEAM GENERATORS
THERMAL POWER PLANTS
VAPOR GENERATORS