ML19224D463
| ML19224D463 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Linder F DAIRYLAND POWER COOPERATIVE |
| References | |
| NUDOCS 7907120227 | |
| Download: ML19224D463 (1) | |
Text
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UNITED STATES f
NUCLEAR REGULATORY COMMISSION
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GLE N E LLY N, lLL.NOIS 60137 JUN 211979 Docket No. 50-409 Dairyland Power Cooperative ATTh:
Mr. F. W. Linder General Manager 2615 East Avenue - South La Crosse, WI 54601 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,
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M
, James G. Keppler Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Mr. R. E. Shimshak, Plant Superintendent Central Files Directer, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Antbony Roisman, Esq.,
Attorney bio 3iL n
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T 0 07120 3'2'74
U.S. NUCLEAR R7GULATORY 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 ANCHOR BOLTS Description of Circumstances:
Since the issuance of IE Bulletin 79-02 on March 8,1979, IE inspeccion 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 been deleted, and the due r' ate 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 requirements.
While performing inservice inspections during a March-April 1978 refueling outage at Millsto 2e 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 enderestimation 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
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7, ' ~ 7 wide range of design practices and installation procedures which have been employed for the use of concrete expansion anchors. The c'irrent trends in the industry are toward more rigorous controls and verification of the instal-lation of the bolts.
_. - -- w The data available on dynamic testing of h
fatigue failures can occur at loads subst/ D0PLICATE DOCUMENT cities due to material imperfections or nc' also show low cycle dynamic failures at Ic. Entire documen^ previously entered
'!ue to joint slippage.
into system undt J
- Lines indicate changes to previous editi d
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