ML19224D458
| ML19224D458 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7907120215 | |
| Download: ML19224D458 (1) | |
Text
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'o UNITED STATES NUCLE AR REGUi.ATORY COMMISSION IC 8'
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799 ROOSEVELT ROAD 5
j GLEN E LLYN, ILI INOls 60137
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Docket No. 50-358 Cincinnati Gas and Electric Company ATTN:
Mr. Earl A. Borgmann Vice President Engineering Services and Electric Production 139 East 4th Street Cincinnati, OH 45201 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 regarding this Bulletin or the actions required by you, please contact this office.
Sincerely,
% lN aff James G. Keppler
Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Mr. J. R. Schott, Plant Harold W. Kohn, Power Superintendent Siting Commission Central Files Citizens Against a Radioactive Director, NRR/DP!!
Environment Director, NRR/ DOR Helen W Evans, State of PDR Ohio Local PDR NSIC TIC 3}h 79071202/f
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 SUPPORT BASE PLATE DESIGNS USING CONCRETE EXPANSION AhCHOR BOLTS Description of Circurastances:
Since the issuance of IE Bulletin 79-02 on March 6, '979, IE inspection l
experience and many inquiries from licensees 17 dica.e that additional informa-tion and clarification is needed. This revir. ion is intended to serve that purpose. None of the requirements of tha original Bullet!n ha-- been deleted, and the due date for completion of the ;equested actions (July 6, 1s791 has not been changed. The following text sapersedes the text of Bullatin 79-02.
Changes from the original text are iden ified 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 'nilures of piping supports for safety equipment were observed by the licer r*,
Subsequent licensee inspections of undamaged supports showed a large percentsge of the concrete anchor Lolts were not tightened proper 1.
f Deficiency reports, in accordance with 10 CFR 50.55(e), filed by Long Island Lighting Cocpany 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 beha"e 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 jf] " i] c wide range of design practices and installation procedures which have been e= ployed 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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The data available on dynamic testing of ' DUPLICATE DOCUMENT fatigue failures can occur at loads subs 1 l
cities due to material imperfections or d Entire document previously entered also show low cycle dynamic failures at into system under-due to joint slippage.
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