ML19269D106
| ML19269D106 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 02/09/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7902270328 | |
| Download: ML19269D106 (1) | |
Text
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GLE N ELLYN, ILLINOIS 60137 FEB 9
.379 Docket No. 50-358 Cincinnati Gas and Electric Company ATTN:
Mr. Earl A. Borgmann Vice President Engineering Services and Electric Froduction 139 East 4th Street Cincinnati, OH 45201 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 pos.aible applicability to their facili-ties. No specific action or re ponse is requested at this time.
If further NRC evaluctions so indicate, an IE Circular or Eulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
(/JamesG.$
WM$
Kep er Director
Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Mr. J. R. Schott, Plant Superintendent Central Files Director, NRR/DPM Dil;ector, NRR/ DOR PDR Local PDR NSIC TIC U. Young Park, Power Siting Commission 7902;37ogp
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT RECION III 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 replace =ent grease for switch cpplications where the temperature exceeds 140 degrees Fahrenheit. Tests conducted by liobil and Limitorque Corporation indicate that Mobilgrease 28, in addition to having a superior temperature rating, will satisfy the same environ = ental 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 possibic. applicability to their-facilities.
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 the appropriate NRC Regional Office.
Enclosure:
List of IE Information Notices Issued in 1979 Odf1?
N 7902150358
=
IE Information Notice No. 79-03 February 9, 1979 LISTING OF IE INFOR!!ATION NOTICES ISSUED IN 1979 Information Subject 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 79-02 Attempted Extortion -
2/2/79 All Fuel Facilities Low Enriched Uranium