ML19225B124
| ML19225B124 | |
| Person / Time | |
|---|---|
| Site: | 05000516, 05000517, Shoreham File:Long Island Lighting Company icon.png |
| Issue date: | 06/21/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Wofford A LONG ISLAND LIGHTING CO. |
| References | |
| NUDOCS 7907230674 | |
| Download: ML19225B124 (1) | |
Text
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UNITED STATES 77C y
g'3 g NUCLEAR REGULATORY COMMISSION
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REGION I
'O 631 PA RK AVENUE
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KING oF PRUSSIA, PENNSYLVANIA 19406 Docket Nos. 50-322 50-516 21 JUN 1979 50-517 Long Island Lighting Company ATTN:
Mr. Andrew W. Wofford Vice President 175 East Old Country Road Hicksville, New York 11801 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No.1, which requires action by you with regard to your power reactor facility (ies) with an operating license or a construction permit.
Should jou have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, G
/Y W Soyce H. Grier
~
Director
Enclosures:
1.
IE Bulletin No. 79-02 (Revision No. 1) 2.
List of IE Bulletins Issued in Last Twelve Months cc w/encis:
J. P. Navarro, Project Manager Edward M. Barrett, Esquire Edward J. Walsh, Esquire T. F. Gerecke, Manager, Engineering QA Department 368 044 gg)nace %
..t ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bullatin No. 79-02 (Revision No. 1)
Date:
June 21, 1979 Page 1 of 6 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 N
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 date for completion of the requested actions (July 6, 1979) has not been changed.
The following text.upersedes the text of Bulletin 79-02.
Changes from the original text are identified by lines in the margin.
The purpose of this revision -;s 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 tn Lighting Company on Shoreham Unit 1, inoicate that design of base plates using v
rigid plate assumptions has resulted in underestimation of loads on some O
anchor bolts.
Initial investigation indicated that nearly fifty percent of the base plates could not be assumed to behave as rigid plates.
In addition, g
licensee inspection of anchor bolt installations at Shoreham has shown over m
fifty percent of the bolt installations to be deficient.
m 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.
The data available on dynamic testing of tha.cnnsre w m ci m e r d s - -
fatigue failures can occur at loads sut f
DUPLICATE DOCUMENT cities due to material imperfections or also show low cycle dynamic failures at Entire document previously entered due to joint slippage.
into system under:
l-ANO 790 k2 9 C
, Lines indicate changes to previous ec y
No. of pages:
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