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Repts on maint item from Apr - May 1971 outage.Ultrasonic testing revealed 92 of 2,646 pins in turbine cracked or broken.Failure caused by intergranular stress corrosion cracking due to chloride & sulphur substances in oil.

Accession Number: ML20090D789

Date Released: Tuesday, March 2, 2021

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• ML20090D782 - Repts on maint item from Apr - May 1971 outage.Ultrasonic testing revealed 92 of 2,646 pins in turbine cracked or broken.Failure caused by intergranular stress corrosion cracking due to chloride & sulphur substances in oil. (2 page(s), 9/25/1971)
• ML20090D792 - Forwards rept on metallurgical exam of stainless steel boat sample from reactor vessel nozzle safe-end N7G.Findings inconclusive.Surveillance program should be continued. (2 page(s), 9/21/1971)
• ML20090D800 - Inquiry Rept 50-220/71-B on 710420 re inservice insp. (2 page(s), 4/21/1971)