ML19246B085
| ML19246B085 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 06/21/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7907120098 | |
| Download: ML19246B085 (1) | |
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[p* ** Cuq'o, UNITED ST ATES NUCLE AR REGULATORY COMMISSION
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,8 101 M ARIET T A ST., N W., $UIT E 3100 AT L AN T A. G E oH GI A 30303 g, ' u g JUN 211979 In Reply Refer Tot RII:JPO South Carolina Electric and Cas Company Attn:
T. C. Nichols, Jr., Vice President Power Production and System Operations Post Office Box 764 Columbia, South Carolina 29218 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.1, which requires action by you with regard to yc. r power reactor f acility(ies) with an operating license or a construction per.it.
Should you have any questions regarding this Eulletin or the actions required by you, please contact this office.
Sincerely,
"?~5 W
g James P. O'Reilly Director
Enclosure:
- 1. IE Eulletin Nc. 79-02 Revision No. 1
- 2. Listing cf IE Enlletins Issued In Last Twelve. Months o.
U (c r n, tit.J' 3 4 d,
79071200%,
UNITED STATES NUCLEAR REGUI ATCRY COFMISSION OFFICE OF INSPECTION AND ENTORCEMEh7 WASHINGTON, D.C.
20555 June 21, 1979 IE Bulletin No. 79-02 (Revision No.1)
(7906200183)
P1FE SUFFORT BASE FLATE DESIGNS USING CONCRETE EXPANSION ANCH Description of Circu= stances:
a Since the issuance of IE Bulletin 79-02 on March 8,1979, IE inspection additional informa-experience and cany inquities from licensees indicate thatThis revision is intended t tion and clarification is needed.
None of the require =ents of the original Bulletin have been deleted, (July 6, 1979) has purpose.
and the due date for cocpletion of the requested actions of Bulletin 79-02.
The following text supersedes the text not been changed.
The Changes f rom the original text ere identified by lines in the cargin.
purpose of this revision is to identify acceptable ways of satisfying the Bulletin requirements.
While perforcing inservice inspections during a March-April 1978 refueling 1, structural f ailures of piping supports for safety outage at Millstone Unit licensee inspections of Subsequent equipment were observed by the licensee.
undataged supoorts 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 Shoreha: Unit rigid plate assumptions has resulted in underestication of loads on anchor bolts.
In addition, the base plates could not be assu=ed to behave as rigid plates.
licensee inspection of anchor bolt installations at Shoreha: has shown over fifty percent of the bolt installations to be deficient.
Engineering fires have shown a Vendor Inspection Audits by NRC at Architect vide range of design practices and installation procedures which have been The current trends in esployed for the use of concrete expansion anchors.the industry ar lation of the bolts.
The data available on dynacic testine oLthe. conc etc. e ran ion anchors _ shew _
loadsw fatigue failures can occur at cities due to raterial itperfectiori DUPLICATE DOCUMENT
~7 Ed 'a LP' pa also shev low cycle dynamic failurg due to joint allppage.
jEntire document previously entered linto system under:
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- Lines indicate changes to previot ANO I
l No. of pages:
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