ML19249C166
| ML19249C166 | |
| Person / Time | |
|---|---|
| Site: | Sterling |
| Issue date: | 08/20/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arthur J ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7909070524 | |
| Download: ML19249C166 (1) | |
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UNITED STATES e
E'7)'.c.cg['j NUCLEAR REGULATORY COMMISSION y :-
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KING OF PRUSSIA, PENNSYLVANIA 19406 Docket No. 50-485 4US 2 01979 Rochester Gas & Electric Corporation ATTN:
Mr. J. E. Arthur Chief Engineer 89 East Avenue Rochester, New York 14649 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which is for-warded to vou for information. No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, J Ya bb Boyce H. Grier Director
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 2.
List of IE Bulletias Issued in Last Six Months cc w/encls:
C. R. Anderson, Manager, QA Lex K. Larson, Esquire N. A. Petrick, Executive Director, SNtJPPS Gerald Charnoff, Esquire am ano 7909070sz'l
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
Date:
August 20, 1979 Page 1 of 2 PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
The supplement to IE Bulletin No. 79-02 is intended to establish criteria for the evaluation of interim acceptability of plant operation with less than the design factors of safety for piping supports due to as-built problems, under design, base plate flexibility, or anchor bolt deficiencies.
In the reviews for system operability of the Duane Arnold and Crystal River facilities, criteria have been developed by the NRC staff that define pipe support operability.
The criteria have been applied in lieu of other analysis or evaluation.
Specifically, the licensees identified problems with pipe supports in which the original design factors of safety were not met but some lesser margin was available.
The design margins of four or five are intended to be final design and installation objectives but systems may be classed as operabie on an interim basis with some lesser margin providing a program of restoration to at least the Bulletin factors of safety has been developed.
Facilities which fall outside the operability criteria are considered to probably require a Technical Specification exception and will require review on a case by case basis.
Action to be Taker, by Licensees:
For the following two cases, plant operation may continue or may begin:
a.
For the support as a unit, the factor of safety compared to ultimate strengths is less than the original design but equal to or greater than two.
b.
For the anchor bolts the factor of safety is equal to or greater than two and for the support steel the original design factor of safety compared to ultimate strengths is met.
The above criteria may be applied p
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_ ^~u" gri2ded to design margins of safety supports and by the next refueling DUPLICATE DOCUMENT d
is as defined in Bulletin No. 79-14 those areas of the plant which can Entire document previously entered into system under:
2 Ano 7 9 0 8 /5' O/ W No. of pages:
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