ML19338D388
| ML19338D388 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 08/28/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8009230081 | |
| Download: ML19338D388 (1) | |
Text
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UNITED STATES 8'
NUCLEAR REGULATORY COMMISSION c
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2 M
.E REGION til W
799 ROOSEVELT ROAD
'V GLEN ELLYN, ILLINOIS 60137 o
MUS e 8 t980, Docket No. 50-358 Cincinnati Gas and Electric Company ATTN:
Mr. Earl A. Borgmann Senior Vice President Engineering Services and Electric Production 139 East 4th Street Cincinnati, OH 45201 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.
Sincerely,
.f &
A James G. Keppler Director
Enclosure:
IE Information Notice No. 80-31 1
cc w/ encl:
Mr. J. R. Schott, Plant Local PDR Superintendent NSIC Central Files TIC Director, NRR/DPM Harold W. Kohn, Power Director, NRR/ DOR Siting Commission AEOD Citizens Against a Radioactive Resident Inspector, RIII Environment PDR Helen W. Evans, State of Ohio 8009230081 3L
SSINS No.: 6870 Accession No.:
8006190040 IN 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 August 27, 1980 IE Information Notice No. 80-31:
MALOPERATION OF GOULD-BROWN BOVERI 480 VOLT-TYPE K-6005 AND K-DON 6005 CIRCUIT BREAKERS Description of Circumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-6005 and K-DON 6005 circuit 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 on the snunt 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 verdor has stated that a small number of circuit breakers were assembled with under-sized secondary latch bushings 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-600S 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-60CS, 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 circuit breaker occurs during performance of the field test procedure described in Item (2) above, perform the corrective est procedure (installation of a and retest of the circuit breaker).
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