ML20004F800
| ML20004F800 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek, Cooper, Arkansas Nuclear, River Bend, Waterford, South Texas, Comanche Peak, Fort Calhoun, Fort Saint Vrain  |
| Issue date: | 03/11/1981 |
| From: | Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| NUDOCS 8106220415 | |
| Download: ML20004F800 (1) | |
Text
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.e UNITED STATES
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NUCLEAR REGULATORY COMMISSION k,E REGICN IV
',h,,,8 AAUNGTCN. TEXAS 70011
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511 AYAN PLAZA DRIVE. SUITE 1000 MEMCRANDUM FOR: Those Listed Selow FROM:
G. L. Madsen, Chief, Reactor Project!
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SUBJECT:
INF0PNATION NOTICE NO. 81-06 Subject IE Infontation Notice has been sent to the following licensees.
A copy is attached for your infoniation.
Arkansas Power & Light Company Gulf States Utilities ANO-1 & 2 (50-313, 50-368)
River Bend (50-458; 50-459)
Nebraska Public Power District Houston Lighting & Power Ccmoany Cooper Nuclear Station (50-298)
South Texas (50-498; 50-499)
Omaha Public Power District Kansas Gas & Electric Company Ft. Calhoun Nuclear Station (50-235)
'dolf Creek (STN 50-482)
Public Service Ccmpany of Coloraco Louisiana Power & Light Company Fort St. Vrain (50-267)
Waterford 3 (50-382)
Texas Utilities Generating Company Ccmanche Peak (50-445; 50-446)
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G. L. Madsen, Chief Reactor Projacts Branch
Attachment:
As stated DISTRIBUTION:
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8011040259 L'NITED STATES NUCLEAR REGULATORY CCMMISSICN OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTCN, D.C.
20555 IE Information Notice No. 31-06 March 11,1951 Page 1 of 1 FAILURE OF ITE MODEL K-600 CIRCUIT BREAXER Purcose:
The purpose of this information notice is to provide early notification of a matter that could adversely affect the safety of nuclear power plants.
Toward this end, this information notice alerts holders of operating licenses and construction permits of a possibly generic deficiency involving Model K-600 circuit breakers manufactured by ITE.
Descriotion of Circumstance:
By letter dated February 20, 1981, the Sacramento Municipal Utility District informed us that, wnile performing preventive maintenance on electrical circuit breakers at its Rancho Seco facility, an ITE Model K-600 breaker was observed not to trip. An investigation revealed that a tripoing coil wire had slipced out of its terminal.
Further examinations revealed that the coil wire size was AWG 20, whereas the mating lug was sized for AWG 16-14 wire.
A check of other ITE electrical breakers indicated that the problem may be generic.
Subsequent to the letter, the Sacramento Municipal Utility District informed us orally that ITE Model K-1600 breakers have the same deficiency and that Model K-3000 breakers may be similarly affected.
The information provided by the Sacramento Municipal Utility District is pre-liminary and will be followed by a comolete recort.
Consequently, we have not yet evaluated the safety significance of this event.
Nevertheless, the information herein is being provided as an early notification of a possioly significant ovent. Althougn no soecific action or response is requested at this time, recipients should review the information for possible acclicability to their facilities.
If NRC evaluations so indicate, further licensee actions may be requested.
If you have any question regarding the information contained herein, please contact the Director of the appropriate NRC Regional Office.
IE Information Notice No. 81-06 March 11,1981 LISTING OF RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued To Notice No.
Issued 80-43 Failures of the Continuous 12/5/80 All power reactor
' dater Level Monitor for facilities with an the Scram Discharge Volume Operating License (OL) at Dresden Unit No. 2 or Construction Permit (CP) 80-44 Actuation of ECCS in the 12/16/80 All power reactor Recirculation Mode While facilities with an in Hot Shutdown Operating License (OL) or Construction Permit (CP) 80-45 Potential Failure of 12/17/80 All pressurized water BhR Backup Manual Scram reactor facilities with Capability an Operating License (OL)
Construction Permit (CP) 81-01 Possible Failures of 1/16/81 All power reactor facilities General Electric Type with an Operating License HFA Relays (OL) Construction Permit (CP) 81-02 Transportation of 1/23/81 All Radiograohy licensees Radiography Devices 81-03 Checklist for Licensees 2/12/81 All power reactor Making Notifications of facilities with an Significant Events in Operating License (OL) and Accordance witn Near-term Apolicants 10 CFR Part 50.72 81-04 Cracking in Main Steam 2/27/81 All power reactor facilities Lines with an Coersting License (OL) or Construction Permit (CP) 81-05 Degraded OC System at 2/10/81 All power reactor facilities Palisades with an Ocerating License (OL) or Construction ?ermit (CP)
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