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Vertest was engaged by QAL to Ultrasonically inspect Digester 1 and 5 Slurry Inlet lines for possible Stress Corrosion Cracking (SCC).

The client requested the lines be inspected ultrasonically to detect the possible presence of SCC after an increase in caustic concentration in 1999.

Vertest technicians prepared and inspected all welds combining both rope access means and EWP to gain access to the inspection locations. Evidence of SCC was found in a small number of welds with ongoing investigation and remediation currently underway.