ML19344F139
| ML19344F139 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/27/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Papay L SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8009120463 | |
| Download: ML19344F139 (1) | |
Text
.
[ h-
+
-[
'of -
UNITED STATES '
E y).n j
NUCLEAR REGULATORY COMMISSION
- C ~* (*
.j REGION V
[g 1390 N CALIFORNIA BOULEVARD
%, ',%.J SulTE 202, WALNUT CREEK PLAZA WALNUT CREEK CALIFORNIA 94596
' August 27, 1980 Docket ilos.- 50-206,' 50-361, 50-362
. Southern California Edison Company P. O. Box 800 2244 Walnut Grove Avenue Rosemaad, California 91770
. Attention: Dr. L. T. Papay, Vice President Advanced Engineering Gentlemen:
This.Information tiotice 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 recommended action.
If you have questions regarding this matter, please contact the director of this office. -
Sincerely,
~,c'b j
R. H. Engelxen Director
Enclosures:
1.
IE Information ilotice ilo. 80-31 2.
Recently issued IE-
. Infonnation. flotices cc w/ enclosures:
J. I1. Curran, SCE R._Dietch~, SCd-01$Q:f }
l l
i SSIf!S No.: 6870 Accession No.
1 8006190040 Ill 80-31 UtlITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF IllSPECTION At:0 ENFORCEMEflT UASHINGTON, D.C. 20555 August 27, 1980 IE Information Notice No. 80-31: f1ALOPERATION OF G0ULD-BROWN B0 VERI 480 VOLT-TYPE K-6005 AND K-DON 6005 CIRCUIT BREAKERS Description of Circunstances:
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.
I 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 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.
I Reconmended Action for Licensees and Holders of Construction Permits:
All licensees of operating nuclear power reactors and holders of construction 4
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 followino actions be taken:
k (1) Determine if the subject circuit breakers are installed in any safety-related application at your facility. The affected circuit breakers are i
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 Iten (1) above, perform the K-600S, K-00N 600S Field Test Procedure l
attached to this information notice (Gould-Brown Boveri I.B.-9.1.7-6 Issae F, Addendum 2, dated March 4, 1980).
l (3)
It maloperation of the circuit brt l
field test procedure described in DUPLICATE DOCUMENT action described in the attached f O.050 shim to the secondary close Entire document previously entered into system under:
goa 6190040 ANo No. of pages:
Y
--