ML19338D386
| ML19338D386 | |
| Person / Time | |
|---|---|
| Site: | Marble Hill |
| Issue date: | 08/28/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Shields S PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA |
| References | |
| NUDOCS 8009230079 | |
| Download: ML19338D386 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION y
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GLEN ELLYN, ILLINOIS 6o137 U
IAU6 2 81980 Docket No. 50-546 Docket No. 50-547 Public Service of Indiana ATTN:
Mr. S. W. Shields Senior Vice President Nuclear Division Post Office Box 190 New Washington, IN 47162 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, i
M.
James G. Keppler Director
Enclosure:
IE Information Notice No. 80-31 cc w/ encl:
Mr. Steve J. Brewer, Nuclear TIC Safety and Licensing Supervisor LeBoeuf, Lamb, Leiby & MacRae Central Files Mr. Dave Martin, Office of the Director, NRR/DPM Attorney General Director, NRR/ DOR Mr. John R. Galloway, Staff PDR Director, Environment, Energy Local PDR and Natural Resources Subcommittee NSIC 8000280079
SSINS No.: 6870 Accession No.:
8006190040 1N 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTCN, D.C. 20555 August 27, 1980 IE Information Notice No. 80-31:
MALOPERATION OF GOULD-BROWN B0 VERI 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 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 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-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 circuit breaker occurs during performance of the field test procedure described in Item (2) above, perform the corrective action described in the attached field test procedure (installation of a and retest of the circuit breaker).
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