ML19350B231
| ML19350B231 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 03/11/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 8103200130 | |
| Download: ML19350B231 (1) | |
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UNITED STATES 8
NU:: LEAR REGULATORY COMMISSION o
j REGION I ej 0,
631 PARK AVENUE KING oF PRUSSI A. PENNSYLVANIA 19406 ff
/,3 Docket No. 50-213 D 11 1981 Il
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Connecticut Yankee Atomic Power Ccepany Q
by C
e ATTN: Mr. W. G. Counsil 6A 8
Vice President - Nuclear 4 **.
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Engineering and Operations 7~.,,N' m, q y,,
P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
The enclosed IE Information 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 i attachrient CONTACT:
S. D. Ebneter (215-337-5283) cc w/ encl:
R. Graves, Plant Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer gaesto0 0 0
s SSINS No.:
6835 Accession No.:
i 8011040269 IN 81-06 hD0Gl MU b]g/D((
UNITED STATES NUCLEAR REGULATORY COMMISSION 11 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
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_examirstions revealed that the coil wire size was AWG 20, whereas the mating lug was sfzed 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.daficiency 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
..infor; nation 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 tc 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 s-m.
m.
F IN 81-06 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 1
81 Cracking in Main 2/27/81 All holders of a Steam Lines power reactor OL or CP 81-03
- Checklist for 2/2/81 All holders of a Licensees-Making power reactor Notifications of OL or NTOL
-Significant Events in Accordance' wit.h 10 CFR 50.72 81-02 Transportation of 1/P.3/81 All holders of a Radiography Devices radiography.licerise 81-01
- Possible~ Failures of 1/16/81
- All holders of a.
General Electric power reactor OL Type HFA Relays or CP.
80-45 Potential Failure of.
12/17/80 All holders of a BWR Backup Manual power reactor.
Scram Capability OL or CP 80-44
- Actuation of ECCS in 12/14/80 1 holders of a the Recirculation Mode PWR power reactor OL While in-Hot Shutdown
.or CP 80-43 Failures of tha 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 newer reactor No. 1 Flange JL'or CP W
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