ML20084M745

Telecopy AO 3-72-3:on 720814,bus Circuit Breaker 3B 4kv Did Not Close Manually.Caused by Binding Positive Inner Lock Switch Rod.Breaker Replaced

ML20084M745
Person / Time
Site:	Turkey Point
Issue date:	08/16/1972
From:	Schmidt A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20084M733	List: ML20084M738 ML20084M745
References
AO-3-72-3, NUDOCS 8306020319
Download: ML20084M745 (2)

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os/16/72 0931 7 ICS IPMMZFF MIA 'c ZCZC 067 F NL PDF MIAMI FLO AUG 15 PMS DIRECTCR, REGICH 2, DIRECTORATE OF REGULATORY OPERATION US ATOMIC ENERGY COMMISSION SUITE 218 230 PEACHTREE ST NORTH WEST ATLA FLORIDA POWER AND LIGHT COMPANY REPORTS AENORMAL OCCURANCE ,)

1. 3-72-3 ON AUa 14 DURING A PERICDIC TEST 0F THE B DIESEL QENERATOR IN ACCORDANCE WITH TECH SPEC 4,5.1A THE 3B 4KV BUS _

CIRCUIT BREAKER DID NOT CLOSE MANUALLY THE BREAKER WAS REPLACED AND THE REPLACEMENT BREAKER OPERATED PROPERLY THE '

FAULTY BREAKER WAS EXAMINED APO THE POSITIVE INNER LOCK SWITCH

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R0D WAS F00f0 To BE BINDING AS A RESULT 2 AUXILLIARY CONTACTS O

VERE NOT CLOSED APO THIS PREVENTED THE BREAKER FROM CLOSING THE ROD VAS FREED AND LUBRICATED AND THE BREAKER SUCCESSFULLY-

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TESTED IN A LOSS OF POWER SITUATION IF THE BREAKER HAD NOT 3

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g CLOSED SAFETY RELATED EQUIPMENT POWERED FROM THE 33 4KV BUS y WOULD HAVE HAD NO POW 8R SUPPLY REACTCM SAFETY VAS NOT IMPAIRED O

DUE TO REDUNDANT EQUIPMENT ON THE 5A 4A AND 48 BUSSES .

PERMANENT CORRECTIVE MEASURES ItCLUDE INCREASED BREAKER O

PREVENTATIVE MAINTENANCE A D SCHMIDT DIRECTOR OF POWER RESOURCES a,m O

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