ML19344F032
| ML19344F032 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 08/27/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 8009120311 | |
| Download: ML19344F032 (1) | |
Text
/
'o UNITED STATES 8
~g NUCLEAR REGULATORY COMMISSION j
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y a REGION 11 i
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101 MARIETTA ST N.W.. SUITE 3100 ATLANTA, GEORGIA 303o3 s
AUG 2 71980 In Reply Refer To:
RII:JPO C$0-321,_50-36.6 g4 50-424, 50-425 Georgia Power Company ATTN:
J. H. Miller, Jr.
Executive Vice President 270 Peachtree Street Atlanta, GA 30303 Gentlemen:
This Information Notice is provided as a notification of a matter of possible safety significance. It is expected that recipients will review the information for possible applicability to their facilities, and where applicable, consider the recommended action. If you have questions regarding this matter, please contact the director of this office.
Sincerely, g h.$ Qtbk-ames P. O'Reilly irector
Enclosures:
1.
IE Information Notice
- o. 80-31 2.
List of Recently Issued nfo tion Notices cc w/ enc 1:
M. Manry, Plant Manager C. E. Belflower, Site QA Supervisor W. A. Widner, Vice President and General Manager-Nuclear Generatiou K. M. Gillespie, Construction Project Manager E. D. Groover, QA Site Supervisor D. E. Dutton, Project General Manager
.8o 091xo 3to _q_
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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 B0 VERI 480 VOLT-TYPE K-600S AND K-DON 600S CIRCUIT BREAKERS Description of Circumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-600S and K-DON 600S 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 Actica 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:
l (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 600S, 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-600S, K-DON 600S 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 malopera+ ion 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 rocedure installation of a 0.050 shim to the secondary close
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