ML19344F110
| ML19344F110 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 08/27/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Oprea G HOUSTON LIGHTING & POWER CO. |
| References | |
| NUDOCS 8009120423 | |
| Download: ML19344F110 (1) | |
Text
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- q+* *%q,o, UNITED STATES
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-j NUCLEAR REGULATORY COMMISSION
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611 RYAN PLAZA oRIVE, SulTE 1000 E
REGION IV
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' ARLINGTON, TEXAS 76012
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August 27, 1980 In Reply Refer To:
RIV Decket Nos. 50-498/IE Information Notice.No. 80-31' i
50-499/IE Information Notice No. 80-31 Houston Lighting & Power Company ATIN: Mr. G. W. Oprea, Jr.
Executive Vice
- resident Post Office Box 1700 Houston, Texas 77001 Gentlemen:-
This IE Information Notice is provided as a notification of a matter of t
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,
,h Y
& aru/V Karl V'.
Seyfrit Director
Enclosures:
1.
IE Information Notice No. 80-31 2.
List of recently issued IE.
Information Notices i
i 1'l
=
SSINS No.: 6870 Accession No.f 8006190040 9_f 'dl=
J UNITED STATES I
NUCLEAR REGlh TORY 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 GOULD-BROWN B0 VERI 480 VOLT-TYPE K-600S AND K-DON 600S CIRCUIT BREAKERS Description of Circumstanses:
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 circuim bceaker 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-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-D04 600S Field Test Procedure attached to this information notice (Gould-Brown Boveri !.B.-9.1.7-6 Issue F, Addendum 2, dated March 4, 1
(3)
If maloperation of the circuit break DUPLICATE DOCUMENT field test procedure described in It action described in the attached fie Entire dcewnent previously 0.050 inch shim to the secondary clo entered into system under:
breaker).
}nQ] 9;}gLfg ANO No. of pages:
7
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