ML19246C181
| ML19246C181 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/21/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7907230693 | |
| Download: ML19246C181 (1) | |
Text
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UNITED STATES Tgg g y 7) c(y,g NUCLEAR REGULATORY COMMISSION 3 sl((-: l REGION I
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Docket Nos.
7 21 m gg Philadelphia Electric Company ATTN:
Mr. S. L. Daltroff Vice President Electric Production 2301 Market Street Philadelphia, Pennsylvania 19101 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 you have any questions regarding this Bulletin or the actions required by you, please contact this office.
Sincerely, 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:
W. T. Ullrich, Station Superintendent Troy B. Conner, Jr., Esquire Eugene J. Bradley, Esquire Raymond L. Hovis, Esquire Warren Rich, Esquire 359 193 7907230 0 5 '
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_ ENCLOSURE 1 UFITED STA ES NUCLEAR RiGULATORY COMMISSION OFFICE OF INSFECTIO.N AND ENFORCEMENT WASHINGTON, D.C.
20555 IE 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
axperlence and many inquiries from licensees indicate that additional informa-tion and clarification is needed.
This revision is intended to serve that rarpose.
None of the requirements of the original Bulletin have been deteted, and the due date for completiac of the requested actions (July 6, 1979) has not been changed.
The following ;. ext super: 2 des the text of Bulletin 79-02.
Changes from the original text are identified by lines in the margin.
The purpose of this revision i3 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 larga percentage of the concrete anchor bolts were not ti "tened properly.
Deff ency reports, in accordance with 10 CFR 50.55(e), filed by Long Island Lig'
,g Company on Shoreham Unit 1, indicate that design of base plates using rign! ilate 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 Shoreham has shown over fifty percent of the bolt installations t-be deficient.
Vendor Inspection Audits by NRC at Architect Engineerir firms have shown a wide range of design practices and installation proced. es which have been employed for the use of concrete expansion anchors.
l.e current trends in the industry are toward more rigorous controls and verification of the instal-lation of the bo' %.
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The data available on dynamic testing of t DUPLICATE DOCUMENT fatigue failures can occur at loads substs cities dee to material imperfections or nc Entire document previously entered I
also show low cycle dynamic failures at it into system under:
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due to joint slippage.
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l Lines indicate changes to previous edit 359 L9L ~~
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