ML19338D380
| ML19338D380 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 08/28/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 8009230072 | |
| Download: ML19338D380 (1) | |
Text
/ 2 n o go, (lQ UNITED STATES
[
- NUCLEAR REGULATORY COMMISSION
.t REGION ill o,
f 795 ROOSEVELT ROAD
/
GLEN ELLYN, ILLINOls 6o137
-AUG 2 8 G80 Docket No. 50-341 The Detroit Edison Company ATTN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 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, be James G. Keppler Director
Enclosure:
IE Information Notice No. 80-31 cc w/ enc 1:
Central Files Director, NRR/DPM Director, NRR/ DOR AEOD Resident Inspector, RIII PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr.,
Attorney 8009230072
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 JOULD-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.
l 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 1
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 L 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 retest of the circuit breaker).
DUPLICATE DOCUMENT Entire document previously entered into system under:
ANO ND O L 1 Ret.(CD No. of pages: N f
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