ML19224D470
| ML19224D470 | |
| Person / Time | |
|---|---|
| Site: | Marble Hill |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Coughlin J PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA |
| References | |
| NUDOCS 7907120252 | |
| Download: ML19224D470 (1) | |
Text
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GLEN ELLYN, ILLINOIS 60137 Ogq.....
JUN 211979 Docket No. 50-546 Docket No. 50-547 Public Service of Indiana ATTN:
Dr. James Coughlin V4.ce President, Nuclear 1000 East Main Street Plainfield, IN 46168 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.
1, which requires action by you with regard to your power reactor facility with an operating license or a construction permit.
Should you have any questions r garding this Bulletin or the actions required by you, please contact this office.
Sincerely, b
l yr tJames G. Keppler
' Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Mr. R. M. Brown, Censtruction Project Superintendent Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC LeBoeuf, Lamb, Leiby & MacRae 006
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PIPE S'JPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
Since the issuance of IE Bulletin 79-02 oa March 8, 1979, IE inspection e.xperience end many incuiries 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 8
)) has not been changed. The following text supersedes the text of Bu..etin 79-02.
Changes from the original text are identified by lines in the margin.
The purpose of this revision is to identify acceptable ways of satisfying the Bulletin requirements.
While 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 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 Lighting Company on Shoreham Unit 1, indicate that design of base plates using rigid plate assumptions has resulted in underestimation of loals 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 Shorehar has shown over fifty percent of the bolt installations to be deficient.
vendor Inspection Audits by NRC at Architect Eagineering firms have shown a wide 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 and verification of the instal-lation of the bolts.
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a The data available on dynamic testing of ti DUPLICATE DOCUMENT fatigue failures can occur at loads substar e
cities due to material imperfections or not Entire document previously entered E#
also show low cycle dynamic failures at loa into system under:
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due to joint slippage.
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