Jacqueline Cherevaty
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Detailed knowledge of flaw geometry is crucial when conducting the stress analysis of flaws found in the thin-walled zirconium alloy pressure tubes of CANDU reactors.
While ultrasonic fret replica inspection provides much of the required data, measurement of the sharpness or root radius at the bottom of the flaw, requires a replica of the flaw to be taken and subsequently measured.
Immediately upon removal from the reactor, the Fret Replica Inspection Laser Scanner (FRILS) has the capability to provide an accurate profile of the flaw replica. This facilitates rapid analysis and engineering decisions during critical outage situations.
The FRILS system has a depth resolution of < 1 micrometer and a traceable depth accuracy to better than 50 micrometers. The FRILS system is also capable of measuring root radius of < 40 micrometers.