ML19263C640
| ML19263C640 | |
| Person / Time | |
|---|---|
| Site: | Catawba, Perkins, Cherokee  |
| Issue date: | 02/09/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Dail L DUKE POWER CO. |
| References | |
| NUDOCS 7902280089 | |
| Download: ML19263C640 (2) | |
Text
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UNITED STATES 4
NUCLEAR REGULATORY COMMISSION
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ATLANTA, GEORGIA 30303 FEB 9 1979 In Reply Refer To:
13 50-4LD 50-488, 50-489 50-490, 50-491 50-492, 50-493 Duke Power Company Attn:
Mr. L. C. Dail, Vice President Design Engineering P. O. Box 33189 Charlotte, North Carolina 28242 Gentlemen:
This Information Notice is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facilities.
No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to reco==end or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
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s y s -f y James P. O'Reilly Director
Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 7902280 M
FEB 9 1979 Duke Power Company cc w/ encl:
D. G. Beam, Project Manager Catawba Nuclear Station P. O. Box 223 Clover, South Carolina 27910 J. T. Moore, Project Manager Cherokee Nuclear Station P. O. Box 422 Gaffney, South Carolina 29340
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 February 9, 1979 IE Information Notice No. 79-03 LIMITORQUE VALVE GEARED LIMIT SWITCH LUBRICANT Description of Circumstances:
At Commonwealth Edison reactors excessive failure rates of the Limitorque valve geared limit switches were being experienced.
Investigation revealed that the failure mode was a drying out and hardening of the Beacon 325 lubricant.
Once hardening takes place, the brass gears within the limit switch become immobile and destroy themselves when an attempt is made to operate the valve.
The Limitorque Corporation has recommended Mobilgrease 28 as a replacement grease for switch applications where the temperature exceeds 140 degrees Fahrenheit. Tests conducted by Mobil and Limitorque Corporation indicate that Mobilgrease 28, in addition to having a superior temperature rating, will satisfy the same environmental conditions and meet the same qualification parameters as Beacon 325.
All licensee and construction permit holders should consider conducting a review to determine if Beacon 325 lubricant is being used in geared limit switches in environments conducive to drying out and subsequent hardening of the lubricant.
If conditions are found to be conducive to failures, consideration should be given to replacing the grease with a more suitable grease.
This information is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to ti.eir f acilities. No specific action or response is requested at this time.
If further NRC evalua-tions so indicate, an IE Circular or Bulletin will be issued to recom-mend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of L..e appropriate NRC Regional Office.
Enclosure:
List Of IE Information Notices Issued in 1979 Page 1 of 1 Obfl$
7902150358
IE Information Notice No. 79-03 February 9, 1979 LISTING OF IE INFOILMATION NOTICES ISSUED IN 1979 Information Subj ect Date Issued To Notice No.
Issued 79-01 Bergen-Paterson Hydraulic 2/2/79 All power reactor Shock and Sway Arrestor facilities with an OL or a CP a
79-02 Attempted Extortion -
2/2/79 All Fuel Facilities Low Enriched Uranium k
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