ML19224D464
| ML19224D464 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 7907120229 | |
| Download: ML19224D464 (1) | |
Text
/ pa arcoq'o UNITED STATES NUCLEAR REGULATORY COMMISSION TQ 8 ',,, g/' c
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' " j REGION lli a
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799 ROOSEVELT ROAD "N
GLEN ELLYN. ILLINOIS 60'37 JUN 211979 Docket No. 50-341 Tlie Detroit Edison Company ATTN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 Gentlemen:
Enclo:,ed is IE Bulletin No. 79-02 Revision No.
1, which requires action by you sith regard to your power reactor facility with an operating license or a construction permit.
Should you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, n [.N L'
i hJames G. Keppler '
4 Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Loc.! PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr.,
Attorney 318 31$
7007120227'
4 U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(79C6.00183)
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 -larification is needed. This revision is intended to serve that purpose. None of the requirements of the original Bulletin have been deletel, and the due date for completion of the requested actions (July 6, 1979) has not been changed. 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 satisfying the Bulletin requiremente.
While performing inservice inspections during a March-April 1978 refueling outage at Millstone Unit 1, Ltructural failures of piping supports for safety equipment were observed by the licensee.
Subsequent licensee inspections of undtmaged supports showed a large percentage o' the concrete anchor bolts were not tightened properly.
Deficiency reports, in accordance with 10 CFR 50.55(c), 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 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 Shorchcm has shosm over fif?y percent of the bolt installations to be deficient.
719 dlnO JIe Vendor Inspection Audits by NRC at Architect Engineering firms have shosm a wide range of aesign practices and installation procedures which have been employed for the use of concrete expansion anchors. The current trends in the industry are toward mcre rigorous controls and verifiestion of the instal-lation of the bolts.
_1 DUPLICATE DOCUMENT A
The data available on dynamic testing of fatigue failures can occur at loads subst.
E'q cities due to material imperfections or no. Entire document previously entered f
also show low cycle dynamic failures at 1, into system under:
y*
due ta joint slippage.
- Lines indicate changes to previous edit No. of pages:
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