ML19344F138
| ML19344F138 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 08/27/1980 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 8009120460 | |
| Download: ML19344F138 (1) | |
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%';g UNITED STATES NUCLEAR REGULATORY COMMISSION
-5 oj REGION V O
1990 N. CALIFORNIA BOULEVARD 4,+4,,*,&g -
SulTE 202 WALNUT CREEK PLAZA WALNUT CREEK CALIFORNIA 94596
. August 27, 1930-Docket flo. 50-344 Portland general Electric Company 121 S. W.' Salmon Street Portland, Oregon ~ 97204
' Attention:
Mr. Charles Goodwin, Jr.
Assistant Vice President Gentlemen:
This Information 110tice 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 di Netor of this office.
Sincerely, N
dh 3
R. H. Engelken Director
Enclosures:
l.
IE Information Notice
-ilo. 80-31 2.
Recently issued IE Intunnation flotices
~cc w/ enclosures:
C. P. Yundt, PGE F. C. Gaidos, PGE J. W. Lentsch, PGE 18'009720'((d h
4 SSIflS flo. : 6870 Accession No.
8006190040 Irl 80-31 UflITED STATES NUCLEAR REGULATORY COMtilSSI0ft OFFICE OF INSPECTI0fl Afl0 ENFORCEMENT WASHINGT0fi, D.C. 20555 August 27, 1980 IE Information flotice fio. 80-31: MALOPERATION OF GOULD-BROWN B0 VERI 480 VOLT-TYPE K-600S AND K-DON 600S CIRCUIT BREAKERS r
Description of Circumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-600S and K-D0fl 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 problen 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.
Reconmended 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 Guld-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 Ocility 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 Is::ue F, Addendum 2, dated March 4,1980).
(3)
If maloperation of the circuit br.
field test procedure described in DUPLICATE DOCUMENT action described in the attached 0.050 shim to the secondary close Entire do'ument previously entered into system under:
f()(3 br/fdb l/O ANO No. of pages:
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