ML19208B928
| ML19208B928 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/07/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7909240173 | |
| Download: ML19208B928 (1) | |
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1930 N. CALIFORNIA BOULEVARD SUITE 202, WALNUT CREEK PLAZA
,t WALNUT OREE K, CALIFORNIA 94596 September 7,1979 Docket tio:
50-312 Sacramento Municipal 'Jtility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Manager Gentlemen:
The enclosed Supplement 2 to Bulletin flo. 79-14 is forwarded to you to provide added guidance on the intent of the Bulletin.
If you desire additional information regarding this matter, pleas ( contact this office.
Sincerely, hb~,dW5 --
R. H. Engelken Director
Enclosures:
1.
Supplement 2 to IE Bulletin tio. 79-14 2.
List of IE Bulletins Issued in Last Six Months cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 3
7 9092 4 0gy5
4 SSINS:
6820 Accesstion No.: 7908220109 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT UASHINGTON, D.C.
20555 September 7, 1979 IE Bulletin No. 79-14 Supplement 2 SEISMIC ANALYSIS FOR AS-BUILT SAFETY-RELATED PIPING SYSTEMS Description of Circumstances:
IE Bulletin No. 79-14 was issued on July 2, revised on July 18, and first supplenented on August 15, 1979.
The bulletin requested licensees to take certain actions to verify that seismic analyses are applicable to as-built pl ants.
Supplement 2 provides the following additional guidance with regard to implementation of the bulletin requirements:
Nonconfomances One way of satisfying the requirements of the bulletin is to inspect safety-related piping systens against the specific revisions of drawings which were used as input to the seismic analysis.
Some architect-engineers (A-E) however, are recommending that their customers inspect these systems against the latest revisions of the drawings and mark them as necessary to define the as-built configuration of the systems. These drawings are then returned to the AE's of fices for comparison by the analyst to the seismic analysis input.
For licensees taking this approach, the seismic analyst will be the person who will identify nonconformances.
The first supplement to the bulletin provided guidance with regard to evaluation of nonconformances. That guidance is appropriate for licensees inspecting against later drawings. The licensee should assure that he is promptly notified when the AE identifies a nonconformance, that the initial engineering judgment is completed in two days and that the analytical engineering evaluation is completed in 30 days.
If either the engineering judgement or the analytical engineering evaluation indicates that systen operability is in jeopardy, the licensee is expected to meet the applicable technical specification action statement.
Visual Approximations Some licensees are visually estimatingf'~
elements, and have not documented whic(6 DUPLICATE DOCUMENT C " ' d' *6 b*u Jd Visual estimation of dimensions is not e where visual estimates are used, the ag; Entire document previously entered j
ance requirements.
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