ML19225B121
| ML19225B121 | |
| Person / Time | |
|---|---|
| Site: | 05000363 |
| Issue date: | 06/21/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Finfrock I JERSEY CENTRAL POWER & LIGHT CO. |
| References | |
| NUDOCS 7907230672 | |
| Download: ML19225B121 (1) | |
Text
QA MCol o
UNITED STATES
<YA
[h e( ~,
a 92 7 [s( j NUCLEAR REGULATORY COMMISSION
.. j REGION 1 s'f A
g 631 PARK AVENUE O
t w-V KING oF PRUSSIA, PENNSYLVANIA 19406 Docket No. 50-363 21 JON 1971 Jersey Central Power & Light Company ATTN:
Mr. I. R. Finfrock, Jr.
Vice President 260 Cherry Hill Road Parsippany, New Jersey 07054 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 (.1 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, i-f /
? ?,
oyce 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:
M. K. Pastor, Project Manager 368 040
/^
790723D Q 2
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION 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 801 TS Description of Circumstances:
Since the issuance of IE Bulletin 79-02 on March 8,1979, IE inspection M
expe"ience and many Inquiries from licensees indicate that additional informa-tion and clarification is neecad.
This revision is intended to serve that purpose.
None of tne requirements of the original Bulletin have been deleted, aM the due date for completion of the requested actions (Ju!y 6,1979) has
,been changed.
The following text Jupersedes the text of Bulletin 79-02.
aanges from the original text are identified by lines in the margin.
The purpose of this revision is to identify acceptable ways of satisfying tha 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 nct cightened preparly.
Deficiency reports, in accordance with 10 CFR 50.55(e), filed by Long Island Lighting Company on Shoreham 'Jnit 1, indicate that design of base plates using y
rigid plate assumptions has resulted in underestimation of loads on some c3 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 sh:un over CD fifty percent of the bolt installations to be deficient.
Vendor Inspection Audits by NRC at Architect Engineering firms have shown 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 *,.
' ~
- fatigue failures can occur at loads substi IDUPLICATE DOCUMENT cities due to material imperfections or nc also show low cycle dynamic failures at 1:
. Entire document previously entered due to joint slippage.
finto system under:
ANO_ ) O O (p 1 9 (*) 13 Q_
- Lines indicate changes to previous edit No. of pages:
/O gj y,
n ma
,es.
J.z