ML19274F276
| ML19274F276 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 06/21/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7907120033 | |
| Download: ML19274F276 (1) | |
Text
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[paategg'o, UNtTED ST ATES l' s. q NUCLEAR REGULATORY COMMISSION
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E REGION 11 101 MARIETT A ST., N W., SulTi ;100 o,,h.
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d AT L ANT A, GE oRGI A 30303
'b' JUN 211979 In Reply Refer To:
RII:JPO 50-348 50-364 Alabama Power Company Attn:
F. L. Clayton, Jr.
Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291
' Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.1, which requires action by you with regard to your power reactor f acility(ies) with an operating license or a construction permit.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this of fice.
Sincerely, O
v 'v L y w,-
g James P. O'Reilly Dir ector
Enclosure:
- 1. IE Eulletin No. 79-02 Revision No. I
- 2. Listing of IE Bulletins Issued In Last Twelve Months 7007120053
JUN 211979 Alabama Power Company '
cc w/ encl:
A. R. Darton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance Post Office Box 2641 Birmingham, Alabama 35291 R. E. Hollands, Jr.
QA Supervisor Post Office Box U
.Ashford, Alabama 36312 W
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s UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT k'ASHINGTON, D.C.
20555 June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circu= stances:
a Since the issuance of IE Bulletin 79-02 on March ti,1979, IE inspection experience and many inquiries from licensees indicate that additional informa-tion and clarification is needed. This revision is intended to serve that purpose. None of the requirements of the original Bulletin have been deleted, and the due date for completion 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 performing inservice inspections during a March-April 1978 refueling outage at Millstone Unit 1, structural failures of piping supports for safety equipment were observed by the licensee.
Subsequent licensee inspections of unda= aged 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 Long Island Lighting Company on Shoreham Unit 1, indicate that design of base plates using rigid plate assu=ptions has resulted in underestination of loads on some anchor bolts.
Initial investigation indicated that nearly fifty percent of the base plates could not be assumed to behave as rigid plates. In addition, licensee inspection of anchor bolt installations at Shoreha= has shown over fifty percent of the bolt installations to be deficient.
Vendor Inspection Audits by NRC at Architect Engineering fir =s have shown a vide range of design practices and installation procedures which have been employed for the use of concrete expansion anchors. The current trends in the industry are toward more rigorous controls arm verification of the instal-lation of the bolts.
The data available on
' ' '~ % A cnncIrte_ expansion anchors show fatigue failures can ' DUPLICATE DOCUMENT
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'he data cities due to caterie also show low cycle d Entire document capacities due to joint slippag. Into system under lY entered 7 % 29o2 Q
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