ML19344E967
| ML19344E967 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/27/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Arnold R METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 8009120184 | |
| Download: ML19344E967 (1) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
,E REGION I og g
631 PARK AVENUE 4,
,e KING OF PRUSSIA, PENNSYLVANIA 19406 Docket *Nds.
August 27, 1980 Metropolitan Edison Company ATTN:
Mr. R. C. Arnold Senior Vice President 100 Interpace Parkway Parsippany, New Jersey 07054 Gentlemen:
The enclosed IE Information Notica No. 80-31, "Maloperation of Gould-Brown Boveri Type 480 Volt Type K-600S and K-00N 600S Circuit Breakers," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, ce Boyce H. Grier Director
Enclosures:
1.
IE Information Notice No. 80-31 2.
List of Recently Issued IE Information Notices CONTACT:
S. D. Ebneter (215-337-5283) cc w/encls:
J. G. Herbein, Vice President-Nuclear Operations E. G. Wallace, Licensing Manager R. J. Toole, Manager, Unit 1 W. E. Potts, Manager, Radiological Controls, Unit 1 J. W. Brasher, Manager, Radiological Controls, Unit 2 J. J. Colitz, Manager, Plant Engineering, Unit 1 J. J. Barton, Manager Site Operations, Unit 2 B. Elam, Manager, Plant Engineering. Unit 2 R. F. Wilson, Director - Technical functions L. W. Harding, Supervisor of Licensing G. K. Hovey, Director, Unit 2 I. R. Finfrock, Jr.
R. W. Conrad J. B. Lieberman, Esquire G. F. Trowbridge, Esquire Ms. Mary V. Southard, Chairperson, Citizens for a Safe v'ronment
.8009120 /ff/
SSINS No.: 6870 Accession No -
8005190040 d>' A IN 80-31
'7 UNITED STATES l
NUCLEAR REGULATORY COMMISSION l
OFFICE OF INSPECTION AND ENFORCEMENT l
WASHINGTON, D.C. 20555 1
August 27, 1980 t
IE Information Notice No. 80-31: MALOPERATION OF G0ULD-BROWN B0 VERI 480 VOLT-TYPE K-600S AND K-DON 600S CIRCulT BREAKERS Description of Circumstances:
The Cincinnati Gas & Electric Company reported problems with the Gould-Brown Boveri Type K-6003 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 spring: 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.
Recoiamended 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-si:.ed secondary latch bushings betwean 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-6005 and K-DON 6005, 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 in'ormation notice (Gould-Brown Boveri I.B.-9.1.7-6 Issue F, Addendum 2, dated March T980t (3)
If maloperation of the circuit DUPLICATE DOCUMENT field test procedure described action dercribed in the attache Entire document previously 0.050 shim to the secondary clo entered into system under:
ANO TOO in R obLJO No. of pages:
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