ML19350B356
| ML19350B356 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/11/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Weaver E DUQUESNE LIGHT CO. |
| References | |
| NUDOCS 8103200317 | |
| Download: ML19350B356 (1) | |
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Docket No. 50-412 MAR Iy jgg; C
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Ouquesne Light Company ATTN:
Mr. E. J. Woolever
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435 Sixth Avenue 9
0' Pittsburgh, Pennsylvania 15219 m
Gentlemen:
The enclosed IE Ir:fornation Notice No. 81-06, " Failure of ITE Model K-600 Circuit Breaker," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, Boy e H. Grier Director
Enclosure:
1.
IE Information Notice No. 81-06 with 1 attachment CCNTACT:
S. D. Ebneter (215-337-5283) l cc w/ enc 1:
R. J. Washabaugh, Quality Assurance Manager
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8011040269 IN 81-06 h
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~k' UNITED STATES NUCLEAR REGUL \\ TORY COMMISSION 0FFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 March 11, 1981 IE Information Notice NO. 81-06:
FAILURE OF ITE MODEL K-600 CIRCUIT BREAKER puroose:
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 def'ciency involving Model K-600 circuit breakers manufactured by ITE.
Description of Circumstance:
By letter dated February 20, 1981, the Sacramento Municipal Uti'lity District informed us that, while performing preventive maintenance on electric 11 circuit breakers at its Rancho Seco facility, aii ITE Model K-600 breaker wss bserved not to trip. An investigation revealed that a tripping coil wire had slipped out of its terminal.
Further examinations revealed that the coil wire size was AWG 20, whereas the mating lug was si' zed 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 Sacramer.to Municipal Utility District is pre-liminary.and will be followed by a complete report. 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 possibly significant event. Although no specific action or response is requested at this time, recipients should review the information for possible applicability 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.
Attachment:
- Recently issued IE Information Notices
I IN 81-06 i
March 11, 1981 RECENTLY ISSUED IE INFORMATION NOTICES Information Subject Date Issued to Notice No.
Issued 81-05 Degraded DC System 3/10/81 All holders of at Palisades a power reactor OL or CP 81-04 Cracking in Main 2/27/81 All holders of a Steam Lines power reactor l
OL or CP 81-03 Checklist for 2/2/81 All holders of a l
Licensees Making power r-Otor Notifications of OL or h.JL Significant Events in Accordance with 10 CFR 50.72 81-02 Transportation of 1/23/81 All holders of a Radiography Devices radiography license 81-01 Possible Failures of 1/16/81 All holders of a General Electric power reactor OL Type HFA Relays or CP i
80-45 Potential Failure of 12/17/80 All holders of a BWR Backup Manual power reactor Scram Capability OL or CP 80-44 Actu: tion of ECCS in 12/14/80 All holders of a the Recirculation Mode PWR power reactor OL While in Hot Shutdown or CP i
80-43 Failures of the 12/5/80 All holders of a Continuous Water Level BWR power reactor Monitor for the Scram OL or CP Discharge Volume at Dresden Unit No. 2 80-29 Broken Studs on Terry 11/26/80 All holders of a Supplement Turbine Steam Inlet pcwer reactor No. 1 Flange OL or CP
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