ML19269D108
| ML19269D108 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 02/09/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7902270332 | |
| Download: ML19269D108 (1) | |
Text
T 3*
d i,
UNITED STATES s
c O
,' t NUCLEAR REGULATORY COMMISSION f,,,/[
h REGloN lit f
799 ROOSEVELT ROAD g3 GLE N E LLYN, ILLINOIS 60137 FEB 9 J79 Docket No. 50-329 Docket No. 50-330 Consumers Power Company ATTN:
Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 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 further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to reco= mend or request specific licensee actions.
If you have questions regarding the matter, please contact the Director of the appropriate NRC Regional Office.
Sincerely,
.kD b '
JamesG.Kepplkr Director
Enclosures:
1.
IE Information Notico 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 Ronald Callen, Michigan Public Service Commission Dr. Wayne E. North Myron M. Cherry, Chicago 790227o333
a s
e U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND EhFORCEMENT REnION III February 9, 1979 IE Information Notice No. 79-03 LIMITORQUE VALVE GEARED LIMIT SWITCH LUBRICANT Description of Circumstances:
At Co=monwealth 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 destrey themselves when an attempt is made to operate the valve.
The Limitarque 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 *he same qualification parameters as Beacon 325.
All licensee and construction permit holders should consider con. cting a review to determine if Beacon 325 lubricant is being used in geared limit switches in environments conducive to drying out and subsequent hardering 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 re,iew 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-meno or request specific licensee actions.
If you have questions regarding this matter, plerse-contact the Director of the appropriate NRC Regional Office.
Enclosure:
List of IE Information Notices Issued in 1979 bdP6 7902150358
IE Information Notice No. 79-03 February 9, 1979 LISTING OF IE INFORE\\ TION 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
T j#" "%
UNITED STATES f.
NUCLEAR REGULATORY COMMISSION
[ g,'t j
REGloN 111 g
g 2eenoosevetrno40 gm,j c<es cot m itunois co m FEB U J79 Docket No. 50-155 Docket No. 50-255 Consumers Power Company ATTN:
Mr. R. B. DeWitt Manager of Nuclear Plant Operations 212 West Michigan Avenue Jackson, MI 49201 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 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, C,,
%f
(( James'G.K'pler Director
Enclosures:
1.
IE Information Notice No. 79-03 2.
List of IE Information Notices Issued in 1979 cc w/encls:
Mr. C. J. Hartman Local PDR Plant Superintendent NSIC Mr. J. G. Lewis, Plant TIC Superintendent Ronald Callen, Michigan Public Central Files Service Commission Director, NRR/DPM Anthony Roisman, Esq.,
Director, NRR/ DOR Attorney PDR Myron M. Cherry, Chicago 790227039 (
s 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 revea2ed 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
- a. tempt is made to operate the salve.
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 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 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 Qb
~
~
f IE Information Notice No. 79-03 February 9, 1979 LISTING OF IE INFORMATION 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 Uraniun
.