ML19338D394
| ML19338D394 | |
| Person / Time | |
|---|---|
| Site: | Big Rock Point, Palisades File:Consumers Energy icon.png |
| Issue date: | 08/28/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8009230093 | |
| Download: ML19338D394 (1) | |
Text
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[#' >= at 4'h, UNITED STATES
~ * 'n NUCLEAR REGULATORY COMMISSION 3,,
O REGION 111
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799 ROOSEVELT ROAD GLEN ELLYN, ILLINOIS 60137 l
iAus 2 81980 Docket No. 50-155 l
Docket No. 50-255 Consumers Power Company l
ATTN:
.;Mr. R. B. DeWitt Vice President 1
Nuclear Operations 212 West Michigan-Avenue Jackson, MI 49201 1
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 contac*. the director of this office.
i Sincerely, I
1 M*
l ames G. Keppler l
Director
Enclosure:
IE Infermation Notice No. 80-31' cc w/ enc 1:
Mr. D. P. Hoffman, Nuclear Resident Inspectors, RIII i
Licensing Administrator PDR Mr. C. J. Hartman, Local PDR Plant Superintendent NSIC Mr. R. W. Montross, Manager TIC Central Files Ronald Callen, Michigan Director, NRR/DPM Public Service Commission 1
Director, NRR/ DOR Myron M. Cherry, Chicago I
AEOD i
1 8 009230 ogy
L SSINS No.: 6870 p } 'J '
Accession No.:
8006190040
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IN 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 August 27, 1980 i
IE Information Notice No. 80-31:
MALOPERATION OF GOULD-BROWN B0 VERI 480 VOLT-TYPE K-6005 AND K-DON 6005 CIRCUIT BREAKERS DedcriptionofCircumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-6005 and K-DON 600S circuit breakers used in 480 volt a.c.
circuits at the William H. Zimmer nuclear stations.
The problem involved i,nadvertent circuit breaker closure during operation of the breaker charging 4
springs when the breaker was racked out to the test position.
J 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 on the shunt trip device resulting in an inadvertent circuit 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.
Recommended Action for~ Licensees and Holders of Construction Permits:
All licensees of operating nuclear power reactors and holders of construction permits should be aware of the potential problems described above.
The vendor has stated that a small. number of circuit breakers were assembled with under-sized secondary Iatch 6ushings between 1969 and 1977.
It is recommended that
'the following actions be 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-00N 6005, 480-volt a.c. electrically operated, drawout type with static trip device.
i (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).
l (3) If maloperation' of the circuit breaker occurs during performance of the field test procedure describedsin Item (2) above, perform the corrective gegg test procedure (installation of a and retest of the circuit breaker).
' DUPLICATE DbdUMENT i Entire document previcasly,
entered into system under:
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ANO No. of pages:
3 w3-m,
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