Primary Water Stress Corrosion Cracking
Primary water stress corrosion cracking (PWSCC) can occur in PWR primary systems where Alloy 600 components and associated Alloy 82 (GTAW) and Alloy 182 (SMAW) welds were used. Such components and welds were widely applied in U.S. PWRs. Prompted by recent experience with PWSCC in PWR Alloy 82/182 butt welds and small-bore penetrations, as well as by new examination and mitigation requirements in the Materials Reliability Program's Primary System Piping Butt Weld Inspection and Evaluation Guideline (MRP-139), many PWRs are now undergoing PWSCC examinations and repairs. Structural Integrity Associates, Inc. (SI) and its field repair partner, Aquilex WSI, are leaders in these weld overlay butt weld repairs, as well as in nozzle repairs for small-bore primary system penetrations. In just over two years, in response to MRP-139, the team has completed over 20 large-scale weld overlay projects comprising more than 150 weld overlays.For information, please contact
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