ML19224D476
| ML19224D476 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Burstein S WISCONSIN ELECTRIC POWER CO. |
| References | |
| NUDOCS 7907120268 | |
| Download: ML19224D476 (1) | |
Text
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'o UNITED STATES y,,',_',#g'g NUCLEAR REGULATORY COMMISSION fjQ REGION 111 c
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799 ROOSEVELT ROAD o
8 GLEN ELLYN, ILLINOIS 60137 g,..y :
,0 JUN 211979 Docket No. 50-266 Docket No. 50-301 Wisconsin Electric Power Company ATTN:
Mr. Sol Burstein Executive Vice President Power Plants 231 West Michigan Milwaukee, WI 53201 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.
1, which requires action by you with regard to your power reactor facility si+.h an operating license or a constr.tction permi' Should you have any questions regarding this Bulletin or the acti ns required by you, please contact this office.
Sincerely,
[b s'g t hamesG.Keppler L'
Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Mr. G. A. Reed, Plant Manager Central Files Director, NRR/DPM Director, NRR/ DOR C. M. Tremmel, ORB /h3R PDR Local PDR NSIC TIC Sandra A. Bast, Lakeshore Citizens for Safe Energy Q\\
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7007120 @
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III
ne 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PIPE SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
Since the issuance of IE Bulletin 79-02 on March 8, 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 bee-deleted, and the due date for completion of the requested actions (July 6, 1
- 4) has not been changed. The following text supersedes the text of Bul tet_.
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 Shore am Unit 1, indicate that design of base plates using k
rigid plate assumptions has resulted in underestimation 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 Shoreham has shown over fifty percent of the bolt installations to be deficient.
Vendor Inspection Audits by NRC at Architect Engineering 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.
L The data available on dynamic testing of ' DUPLICATE DOCUMENT f:-tigue failures can occur at loads subst; cities due to material imperfectio:
or n: Entire doctunent previously entered also show low cycle dynamic failurt at liinto system under:
- j due to joint slippage.
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