ML19263C620
| ML19263C620 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 02/09/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Short T OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 7902280021 | |
| Download: ML19263C620 (1) | |
Text
CENTRAL FILES e [fc n
UNITED STATES PDR:HQ oq'o NUCLEAR REGULATORY {0MMISSION LPDR
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611 RYAN PLAZA DRIVE, SUITE 1000 o -
t gg{g AR LINGTON, TEXAS 76011 February 9, 1979 Docket tio. 50-285 Omaha Public Pcwer District ATTft:
Mr. T. E. Short, Assistant General flanager 1623 Harney Street Omaha, Nebraska 68102 Gen tlemen:
This Informacien Notice No. 79-03 is provided as an early notification of a possibly significant matter.
It is expected that recipients will review the information for pcssible 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 recommend 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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V-9,{~. { i f ; [ Il j ? & J c
KdrT V. Seyfrit / f Director
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Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 V90228r0 A l
3 UNITED STATES
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NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AllD ENFORCEMENT WASHINGTON, D.C.
20555 IE InforTnation Notice No. 79-03 Date:
February 9,1979 Page 1 of 1 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 plve, 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-ment 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 prnvided 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 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 Mb 790 21503 58
c IE Information flotice\\ o. 79-03 fi February 9,1979 LISTIflG 0F IE If1 FORMATION fl0TICES ISSUED IN 1979 Information Subject Date Issued To flotice flo.
Issued 79-01 Bergen-Paterson Hydraulic 2/2/79 All power reactor Shock and Sway Arrestor facilities with an Operating Licenses (OL) or a Construc-tion Permits (CP) 79-02 Attempted Extortion -
2/2/79 All Fuel Facilities Low Enriched Uranium D
' 9
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