ML19344F119
| ML19344F119 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/27/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| References | |
| NUDOCS 8009120434 | |
| Download: ML19344F119 (1) | |
Text
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' UNITED STATES '
p 4,y n,1 NUCLEAR REGULATORY COMMISSION
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REGION IV
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611 RYAN PLAZA oRIVE, SUITE 1000 o'
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- ARLINGTON, TEXAS 76012 ~
', *...y August 27, 1980 In-Reply Refer.To:
.RIV
.' Docket Nos.
50-445/IE Information' Notice No. 80-31
- 50-446/IE Information Notice No. 80-31 Texas Utilities Generating Company AITN:
Mr. R.EJ.~ Gary,- Executive Vice President and General Manager 2001 Bryan Tower Dallas, Texas 75201~
Gentlemen:
This IE Information Notics is provided as a notification of a matter of
. possible safety significance.
It is expected that recipients will review the informatiion for possible applicability to their facilities, and where i
applicable, consider the recommended action.
If you have questions regarding 1
this matter, please contact the director of this office.
Sincerely, h
.]
Karl V. Seyfrit Director
Enclosures:
1.
IE Information Notice No. 80-31'
~
2.
List of 'recently issued IE Information Notices b
8009120 4 St u
SSINS No.: 6870 Accession No[s:eso 8006190040fr UNITED STATES
' T 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 GOULD-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 not exist during normal operat'ons with the circuit breaker in the connected position.
Recommended Action for Licensees and Holdere 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 ciccuit breaker; 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 Marr T
(3)
If maloperation of the circuit DUPLICATE DOCUbHMfr field test procedure described action described in th? attache Entire document previously 0.050 inch shim to the sec acacy entered into system under.
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