ML19344F135
| ML19344F135 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 08/27/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8009120458 | |
| Download: ML19344F135 (1) | |
Text
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u NUCLEAR REGULATORY COMMISSION -
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. REGION V
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1990 N. CALIFORNIA BOULEVARD
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SulTE 202, WALNUT CREEK PLAZA 4..
e WALNUT CR EEK, CALIFORNIA 94596 August 27, 1980 Docket Nos. !50-133, 50-275, '50-323 Pacific Gas and Electric. Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel 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 recommenced action.
If you have questions regarding this matter, please contact the director of this office.
Sincerely, IfT5~,sn _.
R. H. Engelken Director
Enclosures:
1.
IE Information Notice Ho. 80-31 2.
Recently issued IE
-information Hotices cc w/ enclosures:
J. D. Shiffer, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, - PG&E.,' Humboldt Bay E. B. Langley, Jr. - PG&E d
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SSINS flo.: 6870 Accession No -
8006190040 IN 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSI0ft 0FFICE OF INSPECTI0ft Afl0 ENFORCEMEtlT WASHINGTON, D.C. 20555 August 27, 1980 IE Information flotice No. 80-31: ftALOPERATI0ft 0F GOULD-BROWN B0 VERI 480 VOLT-TYPE K-6005 AND K-D0fl 600S CIRCUIT BREAKERS Description of Circumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-6005 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 nang-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.
Peconmended 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-l 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 6005, 480-volt a.c. electrically operated, dra.;out 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-00N 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 maloperation of the circuit brea field test procedure described in I action described in the attached fi DUPLICATE DOCUMENT 0.050 shim to the secondary close 1 Entire document previously entered into system under:
Rnn(of 90aua ANo No. of pages:
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