ML19269D080
| ML19269D080 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 02/09/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| Shared Package | |
| ML19269D081 | List: |
| References | |
| NUDOCS 7902270252 | |
| Download: ML19269D080 (1) | |
Text
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UNITED STATES h.
6 JUCLE AR REGULATORY COMMISSION j J 'ZL g
HEGION 111
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f GLEN N.
LLINO C0137 g
Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374,40-454, 50-455, 50-456, 50-457 Commonwealth Edison Company ATTN:
Mr. Byron Lee, Jr.
Vice President P. O. Box 767 Chicago, IL 60690 Gentlemen:
This Information Notice is provided as an early nctification of a possibly significant matter.
It is expected that recipients will review the information for possible applicability to their facili-ties.
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
.e.
Sincerely, James G. Kep er Director
Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Mr. B. B. Stephenson, Mr. R. Cosaro, Project Station Superintendent Superintendent Mr. N. Kalivianakis, Central Files Station Superintendent Director, NRR/DPM Mr. N. Wandke, Station Director, NRR/ DOR Super!ntendent PDR Mr. L. J. Burke, Site Local PDR Project Superintendent NSIC Mr. R. J. Legner, Quality TIC Assurance Superviscr Anthony Roisman, Esq., Attorney Mr. Gunner Sorensen, Site Mr. Dean Hansell, Office of Project Superintendent Assistant Attorney General "isoz2?O V >
J 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 excessiva 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 cperate the valve.
The Limitorque Corporation has recom= ended 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 ort 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 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 7902150358 p6P6esmuseu*8'
IE Information Notice No. 79-03 February 9, 1979 LISTING OF IE INFORMATION NOTICES ISSUED IN 1979 Information Subj ect Date Issued To Notice No.
Issued 79-01 Bergen-Paterson Hydraulic 2/2/75 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