ML19224D461
| ML19224D461 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point, Palisades File:Consumers Energy icon.png |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7907120225 | |
| Download: ML19224D461 (1) | |
Text
[pa a r c go UNITED 5TATES y ', 3.,, g ' 'g NUCLEAR REGULATORY COMMISSION g.
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799 HOOSEVELT I!O AD
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f GL EN E L LYN. lL LINOls 60137 JUN 211979 Docket No. 50-155 Docket No. 50-255 Consumers Power Company ATfN:
Mr. R. B. DeWitt Manager of Nuclear Plant Operations 212 West Michigan Avenue Jackson, MI 49201 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.
1, which requires action by you with regard to your power reactor facilities with an operating license or a construction permit.
Shoulu you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, m [Y.
6t
, James G. Keppler
' Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Mr. C. J. Hartman, Local PDR Plant Superintendent NSIC Mr. J. G. Lewis, Plant TIC Superintendent Ronald Callen. Michigan Public Central Files Service Commission Director, NRR/DPM Anthony Roisman, Esq.,
Director, NRR/ DOR Attorney PDR Myron M. Cherry, Chicago 3lR
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s U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PJPE SUPPORT BASE PLATE DESIGNE USING CONCRETE EXPANSION 3NCHOR BOLTS Description of Circumstances:
Since the issuance of IE Bulletin 79-02 on March 8, 1979, IE inspection cxperience and many inquiries from licenseea indicate that additional informa-tion and clarification is needed. This revision is intended to serve that purpose.
Noaa of the requirements of the original Bulletin have been deleted, and the due data for completion of the requested actions (July 6, 1979) has not been change 1 The following text supersedes the text of Bulletin 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 catisfying the Bulletin requirements.
While performing inservice inspections during a March-April 1978 refueling outara et Millstone Unit 1, structural failures of piping supports for safety equipment were observer Sy the licensee.
Subsequent licensee inspections of undamaged supports showed a large percentage of the concrete anchor bolts were not *ightened 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 cf loads on some anchor bolts.
Initial investigation indicated that nearly fifty percent of the base plates could not be assumed to behave as rigid pistes.
In addition, licensee inspection of anchor bolt installations at Shoreham has shown over fifty percent of the bolt installations to be deficient.
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\\endor Inspection Audits by NRC at Architect Engineering firms have shown a vide range of design practices and installation procedures which have been employed for the use of concrete expansion anchars. The current trends in the industry are toward more rigorous controls and verification of the instal-lation of the bolcs.
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,m-The data availcble on dynamic testing of tt DUPLICATE DOCUMENT f"
fatigue failures can occur at loads substar
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citie, due to material imperfections or not Entire document previously entered I
also,now low cycle dynamic failures at lor into system under:
fj due to joint slippage.
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- Lines indicate changes to previous editic No. Of Pages:
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