ML19350B383
| ML19350B383 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/11/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8103200378 | |
| Download: ML19350B383 (2) | |
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NUCLEAR REGULATORY COMMISSION
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March 11, 1981 Gentlemen:
The enclosed IE Information Notice No. 81-06 contains information that may be applicable to your facility regarding the failure of an ITE Model K-600 circuit breaker. No specific action or response is requested at this time; however, pending the results of NRC staff evaluations of this matter, further licensee actions may be requested.
Should you have any questions regarding this information notice, please contact thia office.
Sincerely, O
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Director EJ.:losure:
IE Information Notice No. 81-06 flo3&oo377
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6835 Accession No.:
8011040269 IN 81-06 UNITED STATES D
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NUCLEAR REGULATORY COMMISSION
_9 o 2J OFFICE 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
Purpose:
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.
Description of Circumstance:
By letter dated February 20, 1981, the Sacramento Municipal Utility District informed us that, while 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 tripping coil wire had slipped out of its terminal.
Further examinstions 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 deficien y 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 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 50 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:
decently issued IE Information Notices
Attachment IN 81-06 March 11, 1981 RECENTLY ISSUED IE INFORMATION NOTICES Information Date of Notice No.
Subject Issue Issued to 81-05 Degraded DC System at 2/10/81 All power reactor Palisades facilities with an OL or CP 81-04 Cracking in Main Steam 2/27/81 All power reactor Lines facilities with an OL 81-03 Checklist for Licensees 2/12/81 All power reactor Making Notifications of facilities with an Significant Events in OL Accordance with 10 CFR 50.72 81-02 Transportation of 1/23/81 All Radiography Radiography Devices licensees 81-01 Possible Failures of 1/16/81 All power reactor General Electric Type facilities with an HFA Relays OL or CP.
80-45 Potential Failure of 12/17/80 All PWR facilities BWR Backup Manual Scram with an OL or CP Capability 80-44 Actuation of ECCS in the 12/16/80 All PWR facilities Recirculation Mode While with an OL or CP in Hot Shutdown 80-43 Failures of the Continuous 12/5/80 All power reactor Water Level Monitor for facilities with an the Scram Discharge Volume OL or CP at Dresden Unit No. 2 80-42 Effect of Radiation on 11/24/80 All power reactor Hydraulic Snubber Fluid facilities with an 0L or CP 80-41 Failure of Swino Check 11/10/80 All power reactor Valve in the Decay Heat.
facilities with an Removal System at Davis-OL or CP Besse Unit No. 1 OL = Operating Licenses CP = Construction Permits d
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t Doci:et No. 50-483 Dochet No. 50-486 Union Electric Company ATIN:
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