ML19269D124
| ML19269D124 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 02/09/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Gerstner W ILLINOIS POWER CO. |
| References | |
| NUDOCS 7902270353 | |
| Download: ML19269D124 (1) | |
Text
T hh p# "*W UNITED STATES 4
NUCLEAR REGULATORY COMMISSION f [f fj ) j REGloN til 799 ROoSEVE LT ROAD
..yg j C LE N E LLYN, ILLINOIS 60137 FEBD 379 Docket No. 50-461 Docket No. 50-462 Illinois Power Company ATTN:
Mr. W. C. Gerstner Executive Vice President 500 South 27th Street Decatur, IL 62525 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 facili-ties. No specific action or response is requested at this time.
If furcher NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If yau have questions regarding the matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
[JamesW.&["fier ke, %
Ke I Director
Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mr. Dean Hansell, Office of Assistant Attorney General 7 90 2 2 7 o 3 g3
a U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REnION 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 beco=e 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 applications where the temperature exceeds 140 degrees Fahrenheit.
Tests conducted by Mobil and Limitorque Corpor tion 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 crnstruction permit holders should consider conducting a review to determine if Beacon 325 lubricant is being used in geared limit switches in i nvironments conducive to drying out and subsequent hardening of the li bricant.
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 pd 7902150358
IE *.nformation Notice No. 79-03 February 9, 1979 LISTING OF IE INFOPJfATION 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 79-02 Attempted Extortion -
2/2/79 All Fuel Facilities Low Enriched Uranium