ML19344F114
| ML19344F114 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 08/27/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| Shared Package | |
| ML19344F115 | List: |
| References | |
| NUDOCS 8009120429 | |
| Download: ML19344F114 (1) | |
Text
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CENTRAL FILES
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.D HQ NUCLEAR REGULATORY COMMISSION
- y i.b% '.e REGION IV 3 # I
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611 RY AN Pt.AZA oRIVE, SulTE 1000
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August 27, 1980
-Docket No.
50-298 Nebraska Public Power District ATTN:
J. M. P11 ant, Director Licensing & Quality Assurance Post Office Box 499 Columbus, Nebraska 68601 Gentlemen:
This IE 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 facility, and where applicable, consider the recommended action.
If you have questions regarding this matter, please contact the director of this office.
Sincerely, flVh" Karl V. Seyfrit Directo-
Enclosures:
1.
IE.Information Notice i
No. 80-31 2.
List of recently issued IE Information Notices cc:
L. C. Lessor, Superintendent Cooper Nuclear Station Post Office Box 98 j
Brownville, Nebraska 68321 i
8009120429
SSINS No.: 6870 AccessionNo.[-
8006190040 e o A.
UNITED STATES
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NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 IE Information Notice 80-31 Date:
August 27, 1980 Page 1 of 2 MALOPERATION OF GOUD-BROWN BOVERI 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 station. 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 net 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-600S and K-DON 600S, 480-volt a.c. electrically operated, drawout type with static trip device.
(f ;
If it is determined that your facility has the circuit breakers descr: Ded 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 '
DUPLICATI: DOCUMENT (3)
If maloperation of the circuit bre field test procedure described in Entire. document previously action described in the attached f entered into system under:
0.050 inch shim to the secondary c breaker).
ANO Edd 6 l 9 C)aQO No. of pages:
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