ML19246B084
| ML19246B084 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/21/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7907120096 | |
| Download: ML19246B084 (1) | |
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[ps anau,o UNITED ST ATES NUCLE AR REGULATORY COMMISSION E\\
7 7f' n REGION ll 7
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8 101 M ARIET T A ST., N W, SUIT E 3100
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AT L ANT A GEORGI A 30303 0
'%s x. 2 1 1372 In Reply Refer To:
RII:JPO S0-395 South Carolina Electric and Gas Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing Post Of fice Eox 764 Columbia, South Carolina 29218 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 construetion permit.
Should you have any questions regarding this Eulletin or the actions required by you, please contact this of fice.
Sincerely, s.2
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r g Ja=es P. O'Reilly Director
Enclosure:
- 1. IE Eulletin No. 79-02 Revision No. I
- 2. Listing of IE Eulletins Issued In Last Twelve F nths
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JON21B79
' South Carolina Electric and Gas Cocpany cc w/ encl:
T. B. Coaners, Jr.
Conners, Moore and Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 A. A. S=ith Quality Assurance Post Office Box 8 29065 Jenkinsville, South Carolina O. S. Bradham, Manager Nuclear Operations Post Office Box 8 29065 Jenkinsville, So;th Carolina e
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UNITED STATES NUCLEAR REGULATOR ~i COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 June 21, 1979 IE Eulletin No. 79-02 (Revision No. 1)
(7906200183)
PIPE SUFPORT EASE FLATE DESIGNS USING "NCRETE EXPANSION ANCHOR BOLTS Description of Circu= stances:
a Since the issuance of IE Bulletin 79-02 on March 8, 1979, IE inspection additional informa-experience and many inquiries from licensees indicate that This revision is intended t; serve that tion and clarification is needed.
None of the require =ents of the original Bulletin have been deleted, purpose.
and the due date for co pletion of the requested actions (July 6, 1979) has The following text supersedes the text of Bulletin 79-02.
not been changed.
Changes from the original text are identified by lines in the cargin. The purpose of this reeision is to identify acceptable ways of satisfying the Eulletin requirements.
While performing inservice inspections during a March-April 1978 refueling outage at Millstone Unit 1, structural failures of piping supp-ts for safety equipment were observed by the licensee.
Subsequent licensee inspections of undamaged 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 1, indicate that design of base plates using Lighting Company on Shorehac Unit rigid plate assu ptions has resulted in underestimation of loads on some Initial investigation indicated that nearly fifty percent of anchor bolts.
In addition, the base plates could not be assumed to behave as rigid plates.
licensee inspection of anchor bolt installations at Shoreham has shov1 over fifiy 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 The current trends in ecployed for the use of concrete expansion anchors.
the industry are toward rore rigorous centrols and verification of the instal-lation of the bolts.
The data available on dynamic testing { A rew tetc..cyppnsig~n enchors show
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fatigue failures can oct r at loads su-cities due to r,aterial imperfections c DUPLICATE DOCUMENT also shev low cycle dynamic failures a
,y due to joint slippage.
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