ML19249C142
| ML19249C142 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 08/20/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Dunn C DUQUESNE LIGHT CO. |
| References | |
| NUDOCS 7909070487 | |
| Download: ML19249C142 (1) | |
Text
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UNITED STATES S j )".c,(g(',j NUCLEAR REGULATORY COMMISSION
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Docket No. 50-334 AUS 2 0 m)
Duquesne Light Company ATTN:
Mr. C. N. Dunn Vice President Operations Division 435 Sixth Avenue Pittsburgh, Pennsylvania 15219 Gentlemen:
Enclosed is IE Bulletin No. 79-02, Revision 1, Supplement No. 1, which clarifies NRC positions on actions requested with regard to your power reactor facility (ies) with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely,
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Boyce H. Grier Director g
Enclosures:
1.
IE Bulletin No. 79-02, Revision No. 1 (Supplement No. 1) 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 921266 7 9 09070 '/D
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 p.oblems, 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 operable 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 Taken by Licensees:
For the following two cases, plant operation may continue or may begin:
For the support as a unit, the factor of safety compared to ultimate a.
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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graded to design margins of safety supports and by the next refueling 1, DUPLICATE DOCUMENT
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r is as defined in Bulletin No. 79-14 i Entire document previously entered those areas of the plant which can tj into system under:
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