ML19344F117
| ML19344F117 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 08/27/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | William Jones OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 8009120432 | |
| Download: ML19344F117 (1) | |
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CENTRAL FILES
,/'"; pg UNITED STATES POR:HQ NUCLEAR REGULATORY COMMISSION (pgg 7.* -
. REGloN IV 4.,'
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611 RY AN PLAZA oRIVE. SUITE 1000 -
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ARLINGTON, TEXAS 76012 N$1C x
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August 27, 1980 m-
-Docket No.. 50-285 Omahm Public Power District.
W ATTN:
... C. Jones, Division Manager -
Production Operations
.1623 braey Street Omaha, debraska 68102 Gentlemen:
This IE Information Notice is provided as a notification of a matter of possible safety significance.- It is expected tLac recipients will review the information for possible applicability to their facility, and where applicable, consider the recommended action.
If you have quase.ons regarding this matter, please contact the director of this-office.
Sincerely, f 'hY$'w:lf&"
Karl V. Seyfrit Director
Enclosures:
1.
IE Information Notice No. 80 2.
Lise of recently issued IE' Infotu tion Notices cc:
S. C. Stevens, Manager Fort Calhoun Station Post Office Box' 98' Fort Calhoun, Nebraska 681J2' i
1 28009120.432 0
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SSINS No.: 6870 Accession No.:
8006190040 UNITED STATES 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 problene,ith the Gould-Brown Boveri Type K-600S and K-DON 600S circuit breakers used in 480 volt a.c.
j circuits at the William H. Z'.mmer nuclear station.
The problem involved 1
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 i
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 posit on.
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 deer.cibed 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-DON 600S Field Test Procedure attached to this information notice (Gould-Brown Boveri JB.-9.]7-6 Issue F, Addendum 2, dated March 4, DUPLICATE DOCUMENT (3)
If maloperation of the circuit brea field test procedure described in I Entire doctunent previously action described in the attached fi entered into system under:
0.050 inch shim to the secondary el ANO
$OC d/fdd4M breaker).
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