ML19246C189
| ML19246C189 | |
| Person / Time | |
|---|---|
| Site: | Sterling |
| Issue date: | 06/21/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arthur J ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7907230709 | |
| Download: ML19246C189 (1) | |
Text
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/2-l'o, UNITED STATES y y) 7.. i s,( '
NUCLEAR REGULATORY COMMISSION a.I"Mb/)[/
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Docket No. 50-485 21 JUN 1979 Rochester Gas & E1;ctric Corporation ATTN:
Mr. J. E. Arthur Chief Engineer 89 East Avenue Rochester, New York 14649 Gentlemen:
Enclosed is IE Bulletin No. 79-02 Revision No. 1, wh ch requires action by you with regard to your power reactor facility (ies) with an operating license or a construction permit.
Should you have any questians regarding this Bulletin or the actions required by you, please contact this office..
Sincerely, Ydf e
Boyce 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/encls:
C. R. Anderson, Manager, QA Lex K. Larson, Esquire N. A. Petrick, Executive Director, SNUPPS Gerald Charnoff, Esquire 359 221 7907230709
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555
- E Bulletin 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 M
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 supersedes the text of Bulletin 79-02.
Changes from the origiaal 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 Millstone Unit 1, structural failures of piping supports for safety equipment were observed by the licensee.
Su sequent licensee inspections of undamaged so? ports showed a lat ge percentage of the ' oncrete 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 underestination of loads on some anchor bolts.
Initial investigation ii Jicated that nearly fifty percent of the baie plates could not be assumed to behave as rigid plates.
In addition, licensae inspection of anchor bolt installations at Shoreham has shown over fifty percent of the bolt installations to be deficient.
Vendo 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 cnd verification of the instal-lation of the bolts.
799 The data available on dynamic testipq_ofd h u m f ~ h,z q 0
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s fatigue failures can occur at load!
citiesduetomaterialimgerfectichyph i
reviously entered also show low cycle dynamic failurt nt due to joint slippage.
Entire doc into r/S c
- Lines indicate changes to previou-ANO
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No. of Pages.
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