ML19246B083
| ML19246B083 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 06/21/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 7907120079 | |
| Download: ML19246B083 (1) | |
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I ge aucu UNITED ST ATES f
'e, NUCLEAR REGULATORY COMMISSION
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i REGION il s
101 M ARIE TT A ST., N W., SUIT E 3100 "o, k.Y]!
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AT L AN%, G E O RGI A 30303 j
JUN 211979 In Reply Refer To:
RII:JPO 50-321, 50-366 50-424, 50-425 Georgia Power Company Attnt J. H. Pdller, Jr.
Executive Vice President 270 Peachtree Street, N. W.
Atlanta, Georgia 30303 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.1, which requires action by you-with regard to your power reactor f acil ty(ies) with an operating license or a construction permit.
Should you have any questions regarding this Eulletin or the actions required by you, please contact this of fice.
Sincerely.
nA
~C,TVL g Ja=ea P. O'Reilly Dir ector
Enclosure:
- 1. IE Bulletin No. 79-02 Revision 50. I
- 2. 1.isting of IE Bulletins Issued In Last Twelve Months
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Jl?i211979 Georgia Power Company
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M. Manry, Plant Manager Post Office Box 442 Baxley, Georgia 31513 C. E. Belflower Site QA Supervisor Post Office Box 442 Baxley, Georgia 31513 K. M. Gillespie Construction Project Manager Post Office Box 282 Vaynesboro, Georgia 30830
'E. D. Grover QA Site Suoervisor Post Office Box 282 Waynesbcro, Georgia 308JO e
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UNITED STATES NUCLEAR FIGULATORY CO>Sf1SSION OFFICE OF INSPECTION AND ENFORCEMEhT k'ASHINGTON, D.C.
20555 June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PlPE SLTPORT BASE FLATE DESIG5S USING COSCPITE EXPM;SION A';CHOR BOLTS Description of Circumstances:
a Since the issuance of IE Bulletin 79-02 on March 8, 1979, IE inspection experience and manj inquiries fro: licensees indicate that additional informa-tion and clarification is needed.
This revision is intended to serve that purpose. None of the require =ents of the original Bulletin have been deleted, and the due date for cocpletion of the requested actions (July 6, 1979) has not been changed. The following text supersedes the text of Bulletin 79-02.
Changes from the original text are identified by lines in the cargin. The purpose of this revision is to identify acceptable ways of satisfying the Bulletin requirements.
k'hile perforcing inservice inspections during a March-April 1978 refueling outage at Millstone Unit 1, structural failures of piping supports for safety equip =ent were observed by the licensee.
Subsequent licensee inspections of undataged supports showed a large percentage of the concrete anchor bolts were not tightened properly.
Deficiency reports, in accordance with 10 CFR 50.55(e), filed by I,ong Island Lighting Co=pany on Shorehac Unit 1, indicate that design of base plates using rigid plate assu ptions has resulted in underestimation of loads on so=e anchor bolts.
Initial investigation indicated that nearly fifty percent of the base plates could not be assured to behave as rigid plates.
In addition, licensee inspection of anchor bolt installations at Shcreha has shown over fifty percent of the belt installations to be deficient.
Vendor Inspection Audits by h7.C at Architect Engineering fires have shown a wide range of design practices and installation procedures which have been e= ployed for the use of concrete expansion anchors. The current trends in the industry are toward core rigorous controls and verification of the instal-lation of the bolts.
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also shew low cycle dynamic f all" Entire document previously entered UN due to joint slippage.
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- Lines indicate changes to previ y
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