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Responds to IE Circular 76-06, "Stress Corrosion Cracks in Stagnant,Low Pressure Stainless Piping Containing Boric Acid Solution at PWRs." Ultrasonic exams indicated that all welds acceptable.Visual insp showed no residual heat removal leak.

Accession Number: ML13308B518

Date Released: Saturday, November 7, 2020

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• ML13308B517 - Responds to IE Circular 76-06, "Stress Corrosion Cracks in Stagnant,Low Pressure Stainless Piping Containing Boric Acid Solution at PWRs." Ultrasonic exams indicated that all welds acceptable.Visual insp showed no residual heat removal leak. (3 page(s), 5/12/1977)
• ML13308B519 - RO 77-04:on 770215,during hydrostatic test of containment spray sys,two leaks in heat affected zone of welded joints in Line 734 found.Caused by sensitization to intergranular stress corrosion due to weld technique.Pipe replaced. (1 page(s), 4/1/1977)