ML19208B722
| ML19208B722 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 09/07/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 7909210273 | |
| Download: ML19208B722 (1) | |
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UNITED STATES
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NUCLEAR REGULATORY COMMISSION 3 f-
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,o' KING OF PRUSSIA, PENNSYLVANIA 19406 Docket No. 50-271 Vern.ont Yankee Nuclear Power Corporation ATTN:
Mr. d.obert H. Groce Licer. sing Engineer 20 Turnpike R6ad Westborough, M.issachusetts 01581 Gentlemen:
The enclose 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 contact this office.
Sincerely, 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:
W. F. Conway, Plant Superintendent Ms. J. Abbey, Technical Secretary A. Z. Roisman, Natural Resources Defense Council 3232309 79091102 9
ENCLOSURE 1 SSINS:
6820 Accession No.: 7908220109 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND 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 requested 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 One way of satisfying the requirements of the bulletin is to inspect safety-related piping systems 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 offices for comparison by the analyst to the seismic analysis input.
For licensees taking this approach, the seismic analyst will be the person who wi?1 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 <1ays 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 p
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elements, and have not documented which f DUPLICATE DOCUMENT Visual estimation of dimensions is not e where visual estimates are used, the acc Entire document Previously entered i
utrements.
Further, in document into system under:
ance rekdentify those data that were visi 79ggRROM7 ically Agg 7
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