ML19224D467
| ML19224D467 | |
| Person / Time | |
|---|---|
| Site: | Bailly |
| Issue date: | 06/21/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Shorb E NORTHERN INDIANA PUBLIC SERVICE CO. |
| References | |
| NUDOCS 7907120242 | |
| Download: ML19224D467 (1) | |
Text
pa " cg,'o, UNITED STATES Tl0 f
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REGION 111 0
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N.s GLEN ELLYN,ILLINOls 60137 JON 211979 Docket No. 50-367 Northern Indiana Public Service Company ATTN:
Mr. Eugene M. Shorb Senior Vice President 5265 Hohman Avenue Hammond, IN 46325 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.
Sincere?y, G
O
, /E< t N'k
,1 James G. Keppler Director
Enclosure:
IE Bulletin No. 79-02 Revision No. I cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mr. Dean Hansell, Of fice of Assistant Attorney General b
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79071202 %2
1 U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III June 21, 1979 IE Bulletin No. 79-02 (Revision No. 1)
(7906200183)
PIPE SUPPORT BASE PIl.TE DESIGNS USING CONCRETE EXP/.NSION ANCHOR BOLTS Description of Circumstances:
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 purpose. None of the requirements of the original Bull +in have been celeted, and the due date for completion of the requested actions (July 6, 1979) has not been changed. The following text supersedes the text cf Bulletin 79-02.
Changes from the original text are identified by Jines 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.
Subsequent licensee inspections of undamaged supports showed a large percente,e of the concrete anchor bolts were not tightened preperly.
Deficiency reports, in accordance with 10 CFR 50.55(e), filed by Long Island Lighting Corpany on Shoreham Unit 1, indicate that design of base plates using rigid plate assumptions has resulted in underestimation of loads on some anchor bolts.
Initial investigation indicaned that nearly fifty percent of the base plates could not be assumed to behave as rigid pit tes.
In addition, licensee inspection of anchor bolt irstallations at Shorehan has shown over fifty percent of the bolt installations a be deficient.
Vendor Inspection 4.:dits by NRC at Architect Engineering fin s have shown [/ p
,97 wide range of design practices and installation procedures which have been O )
employed fer the use of concrete expansion anchors. The current trends in the industry are toward more rigorous controls and verification of the instal-e v" ~ "
lation of the bolts.
3 m
The data available on dynamic testing of t DUPI,ICATE DOCUMENT j
fatigue failures can occur at loads substar:
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cities due to material imperfections or not Entire document previously entered O
also show low cycle dynamic failures at loa' Into system under:
jj due to joint slippage.
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