ML19309A185
| ML19309A185 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/16/1972 |
| From: | Rich Smith NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8003260894 | |
| Download: ML19309A185 (1) | |
Text
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UNITED ST ATMs '
w-ATOM:C ENERGY COMMISSION DIREC. TOR ATE OF REGULATORY CPER ATIONS REGION V -
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BERKEl.EY. CAI.IFORNI A 94704 ma es e sess NOV 161972 Sacramento Municipal Utility District '
Docket No. 050-0312 P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe, Assistant General Manager and Chief Engineer Gentlemen:
This acknowledges receipt of your letter of July 17, 1972 which advised us of the records on valve wall thickness that will be available and your plans for demonstrating that valves not covered by suitable reccrds have acceptable wall thickness. The records and valve measurement program will be examined during future routine reactor inspections.
Comments from other licensees indicate the need for clarification regarding the 2% accuracy required if an ultrasonic technique is used for valve measure-ment. The 27. accuracy in valve wall measurement refers to the accuracy required when valve wall thickness approaches the acceptable minimum. An accuracy of 27. is not required when the measurement error could not affect the conclusion that wall thickness meets minimum requirements. However, the measurement technique to be used should be qualified in a manner which will establish the accuracy attainable when the technique is used with material having the range of thickness and configuration of the valve walls under consideration.
If you have any further suggestions or consnents, we will be glad to discuss them with you.
Sincerely, f-R. W. Smith Director cc: Mr. V. McMahon, SMUD
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