ML19344E972
| ML19344E972 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 08/27/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 8009120200 | |
| Download: ML19344E972 (1) | |
Text
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UNITED STATES p
NUCLEAR REGULATORY COMMISSION
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j REGION I t
631 PARK AVENUE i,
V4 KING OF PRUSSIA, PENNSYLVANIA 19406 August 27, 1980 Docket Nos. 50-352 50-353 Philadelphia Electric Company ATTN:
Mr. John S. Kemper Vice President Engineering and Research 2301 Market Street Philadelphia, Pennsylvania 19101 S
Gentlemen:
The enclosed IE Information Notice No. 80-31, "Maloperation of Gould-Brown Boveri Type 480 Volt Type K-600S and K-DON 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, 4
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) i l
l cc w/encls:
l V. S. Boyer, Senior Vice President, Nuclear Power l
l l
.8009120 2Ob
SSINS No.: 6870 Accession No.:
G500(11Q0D IN 80-31 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, C.C. 20555 August 27, 1980 IE Information Notice No. 80-31:
MALOPERATION OF GOULD-BROWN B0 VERI 480 i
VOLT-TYPE K-6005 AND K-DON 600S CIRCUIT BREAKERS Description of Circumstances:
The Cincinnati Gas & Electric Compar.y reported problems with the Gould-Brown Boveri Type K-600S 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 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.
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 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 Gould-Brown Boveri and are types K-600S and K-DON 6005, l
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-6005, 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 Mar DUPLICATE DOCUMENT (3) If maloperation of the circuit field test procedure described Entire document previously action described in the attache er d in o s s e der:
0.050 shim to the secondary clo No. of pages:
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