ML19208B694
| ML19208B694 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/07/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| NUDOCS 7909210210 | |
| Download: ML19208B694 (1) | |
Text
UNITED STATES
,8 bo NUCLEAR REGULATORY COMMisslON h.79 )d ['n R EGloN I
._ j 431 PARK AVENUE g
KING OF PRUSSIA. PENNSYLVANIA 19404 s **v /
September 7, 1979 Docket No. 50-334 Duquesne Light Company ATTN: Mr. C. N. Dunn Vice President Operations Division 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Gentlemen:
The enclosed supplement to Bulletin No. 79-14 is forwarded to you to provide added guidance on the intent of the Bulletin.
If you desire additional information regarding this matter, please concact this office.
Sincerely,
/k W4 oyce H. Grier
" Director
Enclosures:
1.
Supplement 2 to IE Bulletin No. 79-14 2.
List of IE Bulletins Issued in Last Six Months cc w/encls:
F. Bissert, Technical Assistant Nuclear R. Washabaugh, QA Manager J. Werling, Station Superintendent G. Moore, General Superintendent, Power Stations Department J. J. Carey, Nuclear Technical Assistant 30)v2,'03 7 9 0 9410 lf 0 i
ENCLOSURE 1 SSINS:
6820 Accession No.: 7908220109 UNITED STATES NUCLEAR REGULATORY COMMISSION 3
0FFICE OF INSPECTION AIE) ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-14 Supplement 2 Date:
September 7, 1979 Page 1 of 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 supplemented on August 15, 1979.
The bulletin reauested licensees to take certain actions to verify that seismic analyses are applicable to as-built plants.
Supplement 2 provides the following additional guidance with regard to implementation of the bulletin requirements:
Nonconformances i i One way of satisfying the requiremer,is of the bulletin is to inspect safety-related piping systems against the specific revisions of drawir.gs which 1.ere 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 offices for comparison by the analyst to the seismic ana}ysis input.
For licensees taking this approach, the seismic analyst will te the person who will identify nonconformances.
x The first supplement to the bulletin provided guidance with re93rd to evaluation of nonconformances.
That guidance is app 7a riate for licer. sees 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 system operability is in jeopardy, the licensee is expected to meet the applicable technical specification action statement.
Visual Approximations Some licensees are visually estimating.'
elements, and have not documented which dah DUPLICATE DOCUMENT Visual estimation of dimensions is not enc dbows,t e
.w where visual estimates are used, the accurh;Entiredocumentpreviouslyentered ance requirements.
Further, in documentin ically identify those data that were visua fintosystemunder:
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No. of pages:
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