ML19350B306
| ML19350B306 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/11/1981 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mcdonald R ALABAMA POWER CO. |
| References | |
| NUDOCS 8103200238 | |
| Download: ML19350B306 (1) | |
Text
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSION
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ATLANTA, G EoRGIA 30303 r,".
MAR 111981 S.
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In Reply Refer To:
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Alabama Power Company ATTN:
R. P. Mcdonald Vice President-Nuclear Generation P. O. Box 2641 Birmingham, AL 35291 Gentlemen:
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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 cir-cuit 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 this office.
I Sincerely,
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James P. O'Reilly Director
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IE Information Notice No. 81-06 2.
List of Recently Issued IE Information Notices cc w/ encl:
l W. O. Whitt, Executive Vice President F. L. Clayton, Jr., Senior Vice President H. O., Thrash, Manager-Nuclear Generation
- 0. D. Kingsley, Jr., Manager, Nuclear Engineering and Technical Services-J. W. McGowan, Manager-Operations Quality Assurance i
W. G. Hairston, III, Plant Manager W. C. Petty, Manager-Quality Assurance (Design and Construction)
R. E. Hollands, Jr., QA Supervisor r-l L
8103200 8#
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.a SSINS No.:
6835 Accession No.:
8011040269 IN 81-06 UNITED STATES
]D 9 i7 NUCLEAR REGULATORY COMMISSION oaj mJ"
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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 informaUon notice is to provide early notification of a matter that could adversely affect ths 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, whi_le 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 i
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 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 l
to their facilities.
If NRC evaluations so indicate, further licensee actions nay be requested, i
If you have any questions regarding the information contained herein, please contact the Director of the appropriate NRC Regional Office.
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Attachment:
Recently issued IE Information Notices e
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,4 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 Actuation of ECCS in the 12/16/80 All PWR facilities
'80-44 Recirculation Mode While with an OL or CP l
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 i
80-42 Effect of Radiation on 11/24/80 All power reactor l
Hydraulic Snubber Fluid facilities with an l
80-41 Failure of Swing Check 11/10/80 All power reactor l
Valve in the Decay Heat facilities with an Removal' System at Davis-OL or CP j
Besse Unit No. 1 l
OL = Operating Licenses CP = Construction Permits l
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