ML19350B388
| ML19350B388 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 03/11/1981 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8103200394 | |
| Download: ML19350B388 (2) | |
Text
_
^4 UNITED STATES O
O 8~3 NUCLEAR REGULATORY COMMISSION
^
n
- E REGION 111 g'[
g 795 ROOSEVELT ROAD GLEN ELLYN,ILU* MIS 50137 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 this office.
Sincerely, h h4%
WD
[rJames G. Keppler U
Director
Enclosure:
IE Information Notice No. 81-06 O
F703c2OO MY
SSINS No.:
6835 Accession No.:
8011040269 IN 81-06 UNITED STATES D) 3
'g~h $
NUCLEAR REGULATORY COMMISSION g
OFFICE OF INSPECTION AND ENFORCEMEN1 J
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 prc'.ide 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 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 af 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 shos1d review the information for possible applicability to their facilitie:;.
Ir 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
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l ll l
Attachment IN 81-06 March 11, 1981 RECENTLY ISSUED IE INFORMATION N0ilCES Information Date of Notice Nn Subject Issue issued to i
81-05 Degraded DC System at 2/10/81 All power reactor Palisades facilities with an OL or CP j
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 60-44 Actuation of ECCS in the 12/16/80 All PWR facilities Recirculation Mode While with an OL or CP in Hot Shutdown i
l 80-43 Failures of the Continuous 12/5/80 All power' reactor Water Level Monitor for facilities with an I
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 OL or CP 80-41 Failure of Swing 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
Docket Nos. 50-10, 50-237, 50-249; 5 0 - 2.c ',, 'io-265; 50-295, 50-304; 50-373, 50-374; 50-454, 50-455; 50-456, 50-457 Commonwealth Edison Company ATTN:
Mr. Cordell Reed Vice President Post Office Box 767 Chicago, IL 60690 cc w/ encl:
J. S. Able, Director e
of Nuclear Licensing D. J. Scott, Station p
g fj q Superintendent i(
N. Kalivianakis, Plant Af4 II q% 2 U ggIan* 1:
Superintendent f
K. L. Graesser, Station Superintendent
'88g %r
+
9 L. J. Burke, Site 8
Construction Superintendent i
T. E. Qual a, Quality os Assurance Supervisor R. H. Holyoak, Station Superintendent B. B. Stephenson, Project Manager V. I. Schlosstr, Project Manager R. E. Querio, Station Supe.ntendent Gunner Sorensen, Site Project Superintendent R. Cosaro, Project Superintendent J. F. Gudac, Station Su rintendent ral Files AD/ Licensing AD/ Operating Reacters AE0D
// Resident Inspectors, RIII "DR L3 cal PDR NSTC TIC Mary Jo Murray, Office of Assistant Attorney General Myron M. Cherry k
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