ML19249C070
| ML19249C070 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 08/20/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 7909070273 | |
| Download: ML19249C070 (2) | |
Text
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[c, UNITED STATES e
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,e NUCLE AR REG'JL ATORY COMMISSION E
H E GIO N 11 5 YA!. [
101 M ARIE T T A ST. N W. St an i 3100 0,
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e AT L AN T A. GEORGI A 30303 In Reply Refer To:
UILO RII:JPO 50-259 50-260 50-296 Tennessee Valley At.therity ATTU:
H. G.
Parris Manager of I'ever 500A Chestnut Stre.:t Tower 11 Chattanooga, TN 37401 Gen'.lemen:
Enclosed is IE Bulletin No. 79-02, Fevision 1, Supplerent N -).
1, which clariffes NRC positions en actions requested with regaTd tc, your power r.wetor f acility(ies) with an operating license.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, w~
Xt,
... p ' f 1
Jaaes P. O'Ecilfy Director
Enclosures:
1.
IE Bulletin R.
79-02, Revision No. 1 (Supple::ier.t 50. 1) 2.
Listing of IE Bulletins Issued in Lt.st Sir. Mont he.
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SUG%0;g7g Tennessee Valley Autoc.euy cc w/ encl:
J. G. Dewease Plant Superintendent Post Office Box 2000 Decatur, Alabama 35602 J. F. Cox 400 Commerce Street W10C131 C Knoxville, Tennessee 37902 D. E. McCloud Project Engineer 400 Chestnut Street Tower II Chattanooga, Tennessee 37401
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SSINS: 6820 Accession No:
7908150164 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 August 20, 1979 IE Bulletin No. 79-02 Revision No. 1 (Supplement No. 1)
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSI 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 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 defines pipe support The criteria has been applied in lieu of other analysis or evalua-Specifically, the licensees identified problems with pipe supports in which operability.
the original design factors of safety were not met but some le tion.
installation objectives but systems may be classed as operable on an interim basis available.
with some lesser margin providing a program of restoration to at least theFac Bulletin factors of safety has been developed.
operability criteria are considered to probably require a Technical Specifica-tion 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 ulti-mate strengths is less than the original design but equal to or greater a.
than two.
For the anchor bolts the factor of safety is equal to or greater than b.two and for the support steel the original design factor of safety com-pared to ultimate strengths is met.
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The above criteria may be applie s
DUPLICATE DOCUMENT graded to design margins of safe and by the next refueling for no Entire document previously entered fined in Bulletin No. 79-14 wher into system mder:
of the plant which can be entere
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