ML19338D395
| ML19338D395 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 08/28/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Reed C COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009230094 | |
| Download: ML19338D395 (1) | |
Text
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'o,,a UNITED STATES NUCLEAR REGULATORY COMMISSION e
S REGION lli
[
799 ROOSEVELT ROAD e.
GLEN ELLYN,ILLINOls 60137 EUs 2 8 Imol Docket Nos. 50-10, 50-237, 50-249; 50-254, 50-265; 50-295, 50-304; 50-373, 50-374; 50-454, 50-455; 50-456 and 50-457 Commonwealth Edison Company ATTN:
Mr. Cordell Reed Vice President Post Office Box 767 Chicago, IL 60690 Gentlemen:
This IE Information Notice No. 80-31 is provided as a notification of a matter of possible safety significance.
It is expected that recipients will review the information for possible applicability to their facilities, and where applicable, consider the recommended action.
If you have questions regarding this matter, please contact the director of this office.
l Sincerely, James G. Keppler Director
Enclosure:
IE Information Notice No. 80-31
-l cc w/ encl:
Mr. J. S. Able, Director Mr. R. Cosaro, Project of Nuclear Licensing Superintendent Mr. D. J. Scott, Station Central Files Superintendent Director, NRR/DPM Mr. N. Kalivianakis, Director, NRR/ DOR Station Superintendent AEOD Mr. K. Graesser, Station Resident Inspectors, RIII Superintendent PDR Mr. L. J. Burke,-Site.
Local PDR
' Construction Superintendent NSIC Mr. T. E. Quaka, Quality TIC Assurance Supervisor Mr. Dean Hansell, Office of Mr.'R. H. Holyoak, Station Assistant Attorney General
. Superintendent Myron M. Cherry, Chicago Mr. Gunner Sorensen, Site
' Project Superintendent
-8 0092 s o oqq
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., x-SSINS No.: 6870
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Acc@ssion No.:
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8006190040 IN 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 i
August 27, 1980
)
IE Information Notice No. 80-31:
MALOPERATION OF COUL. CSP4N B0 VERI 480 V0LT-TYPE K-6005 ANP,K-DCN 6005 CIRCUIT t
BREAKERS Description of Circumstances:
1 The Cincinnati Gas & Electric Compeny reported problems with the Gould-Brown Boveri Type K-600S and K-DON 6005 circ ~uit breakers used in 480 volt a.c.
circuits at,the William H. Zimmer nuclear stations.
The problem involved inadvertent circuit breaker closure during operation of the breaker charging springs when the breaker was racked out to the test position.
The problem resulted from the use of undersized bushings in the circuit breaker secondary close latches.
The undersized bushings caused the secondary close latch to hang-up or the shunt trip device resulting in an inadvertent circuit
l, breaker closure when the spring charging motor was energized.
The vendor has stated that the problem does not exist during normal operations with the circuit breaker in the connected position.
i Recommended Action for Licensees and Holders of Construction Permits:
'\\'
All licensees of crierating nuclear power reactors and holders of construction t
i permits should be aware of the potential problems described above.
The vendor
')
has stated that a smalt number of circuit breakers were assembled with under-
? sized secondary latch btlshings be ween 1969 and 1977.
It is recommended that 1
the following actions t 4 taken:
(1) Determine if the subject circuit breakers are installed in any safety-related application at your facility.
The affected circuit breakers are manufactured by Gould-Brown Boveri and are types K-6005 and K-DON 6005, 480-volt a.c. electrically operated, drawout type with static trip device.
(2) If it is determined that your facility has the circuit breakers described-in Item (1) above, perform the K-6005, K-DON 6005 Field Test Procedure
. attached to this information notice (Gould-Brown Boveri I.B.-9.1.7-6 Issue F, Addendum 2, dated March 4, 1980).
(3)
If maloperation of the circu'it breaker occurs during performance of the field test procedure described in Item (2) above, perform the corrective est procedure (installation of a
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