ML19319E093
| ML19319E093 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/16/1972 |
| From: | Rich Smith US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8003310602 | |
| Download: ML19319E093 (2) | |
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f) d UNITED STATES ATOMIC ENERGY COMMISSION 7
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REGION V I
DIRECTOR ATE OF REGULATORY OPER ATIONS s,
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2311 B ANCROFT W AY 5,
BERKELEY. CALIFORNI A 94704 E ET. 45 9 trg p 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 records 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 27. 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 attaNbic when the technique is used with material having the range of thickness and configuration of the valve walls under consideration.
i If you have any further suggestions or comments, we will be glad to discuss them with you.
Sincerely, f-1 R. W. Smith l
Director cc: Mr. V. McMahon, SMUD 8003310A M Q i
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c Sacramento Municipal Utility Dist. g ggy2 ii DISTRIBUTION:
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RO Office of Op! rations Evaluation
RO AD for Inspection & Enforcement
~'i' L DD for Reactor Projects RO Files DR Central Files run
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