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Responds to util 721109 & 1206 ltrs re AEC 720913 ltr re valve wall thickness verification program.Requests addl info re sampling plan failure probability & level of confidence involved,valve listings & design pressure ratings.

Accession Number: ML20002C721

Date Released: Thursday, October 24, 2024

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• ML20002C720 - Responds to util 721109 & 1206 ltrs re AEC 720913 ltr re valve wall thickness verification program.Requests addl info re sampling plan failure probability & level of confidence involved,valve listings & design pressure ratings. (2 page(s), 12/27/1972)
• ML20002C729 - Responds to AEC 720629 ltr re min valve wall thickness verification.Outlines future plans re demonstration of acceptable valve wall thicknesses.Exam of Big Rock Point valves deemed unnecessary. (2 page(s), 11/9/1972)
• ML20002C731 - Responds to AEC telcon request for clarification re valve wall thickness verification insp described in util 721109 ltr.Forged & cast valves included.Largest group of valves within reactor pressure boundary is eight. (1 page(s), 12/6/1972)