ML19274F277
| ML19274F277 | |
| Person / Time | |
|---|---|
| Site: | Catawba, Perkins, Cherokee  |
| Issue date: | 06/21/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Dail L DUKE POWER CO. |
| References | |
| NUDOCS 7907120051 | |
| Download: ML19274F277 (1) | |
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NUCLEAR REGULATORY COMMISSION gg
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In Reply Refer To:
Eq y gg7g RII:JPO 50-413, 50-414 50-488, 50-489 50-490, 50-491 50-492, 50-493 Duke Power Company Attn:
L. C. Dail, Vice President Design Engineering P. O. Box 33189 Charlotte, North Carolina 28242 Centlemen:
Ecclosed is IE Bulletin No. 79-02 Revision No.1, which requires action by you with regard to your power reactor f acility(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 of fice.
Sincerely, I
I QN AW g James P. O'Reilly Dir ector
Enclosure:
- 2. List 2ng of IE Bulletins Issued In Last Twelve Months P
70071200 f/ 4
.17 JUN 211979
. Duke Power Company cc w/coc1:
D. G. Beam, Project Manager Post Office Box 223 29710 Clover, South Carolina J. 7. Moore, Projece Manager Post Office Box 422 2931.0 Caffney, South Carolica B
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 June 21, 1979 IE Bulletin No. 79-02 (Revision No.1)
(7906200183)
PITE SLTPORT BASE PLATE DESIGSS USING CONCRETE EXPANSION ANCHOR BOLTS Description of Circumstances:
a Since the issuance of IE Bulletin 79-02 on March 8, 1979, IE inspection experience and many inquiries from licensees indicate that additional informa-tion and clarification is needed. This revision is intended to serve that None of the requirements of the original Bulletin have been deleted, purpose.
and the due date for co=pletion of the requested actions (July 6, 1979) has not been changed. The following text supersedes the text of Bulletin 79-02.
The Changes from the original text are identified by lines in the margin.
purpose of this revision is to identify acceptable ways of satisfying the Belletin 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 unda= aged 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 assu ptions has resulted in underestication of loads on so=e Initial investigation indicated that nearly fifty percent of anchor bolts.
In addition, the base plates could not be assu=ed to behave as rigid plates.
licensee inspection of anchor bolt installations at Shoreham has shown over fifty percent of the bolt installations to be deficient.
Vendor Inspection Audits by FRC at Architect Engineering fires have shown a wide range of design practices and installation procedures which have been The current trends in ecployed for the use of concrete expansion anchors.
the industry are toward more rigorous controls and verification of the instal-lation of the bolts.
The data availabic on dynamic terynj;gpf dhegne, rete,exgnsion anchors show f
_ * *e W) fatiEuc failures can occur at lo j;
cities due to raterial imperfect. DUPLICATE DOCUMENT also shew low cycle dynacie fail' due to joint slippage.
Entire dccument previously entered l
Into sy ' tem under:
06390232 ANO
- Lines indicate changes to prev No. of pages:
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