Conference Proceedings Paper
MINIMIZATION OF LIFT-OFF EFFECTS ON GAP MEASUREMENTS USING OPTIMAL FREQUENCIES
41th Annual CNS-CNA Student Conference - 2017 June 05
P. Bennett (Queen's University/RMC)
G. Klein (Queen's University/RMC)
M. Luloff (OPG)
R. Underhill (RMC)
J. Morelli (Queen's University)
T. Krause (RMC)
Fuel channel inspection in CANDU® reactors employs an eddy current probe to monitor gap between the pressure tube and calandria tube. However, the probe is sensitive to lift-off variations, which can adversely affect estimated gap. A flat plate model of eddy current response to gap was used to examine the effect of drive coil frequency on response to lift-off and gap. Frequencies, where probe response to gap can be isolated from liftoff, were determined. Measurement at these frequencies could improve gap estimates by reducing the error introduced by lift-off variations as may occur near garter spring locations.
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