ML17266A407

LER 81-004/03L-0:on 810126,switch Yard Oil Circuit Breaker Ocb 4E Tripped on Differential Current.Probably Caused by Differential Current Relay.Breaker Closed

ML17266A407
Person / Time
Site:	Saint Lucie
Issue date:	02/25/1981
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A800	List: ML17209A799 ML17266A407
References
LER-81-004-03L, LER-81-4-3L, NUDOCS 8103130366
Download: ML17266A407 (2)

Text

NRC FOAM 28$ UA S NUCLKAR AKOULATORVCOMMISSION l7 773.

LlCENSEE, EVcNT REPORT I

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IPLKASK PRINT OA TYPK ALL AKOUIRSO INFORMAITIONI 1

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LI 5 uCSNSC8 COO8 II' Q 01- I UCSN88 NUM88R I

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",;'IL2Q 40 O'I 5 0 00 CQCXST NVMSSR 5@~12 43 ~ 89 SVSNT QATC '4Q~22 I

15 RSPQRT OATS 151 Q 30 0

PIKNT OKSCAIPTION ANO PROSAKLK CONSCCUKNCKS Qlo Durin return of B'f i w

,~03 facil it a differential current. The B offsite source was placed,out of service and.

Diesel Generator (DG) 'testing continued per TS 3.8.1.1 until offsite* power

. was returned to service. The health and safety of. the. public was not affected. DG.,'s were operable, and the other source of offsite power was

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available at, all times. This is first. event of this. t e.

SYSTSU CAU58 CAUsi COMP: VAI.VS CQO8 CQQ8. SVSCCO8 CQMPQNSNTCQQK

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A TACHMSNT CQQ8 19 4PRQ~

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32 CQM+CNSNT TAiISN2 ACTION CNPLANI'STHQQ HOURS Q22 'U845ITT80 >OII545V8. Rl>PLI R UA4UPACTURSA IrlQRJQ 34 LJrQ2L 35 LIQ 21 40 LSQ 4I I <IQ LAJQ 42 Ltlt12 AQ 41 C*USK CONSCRIPTION *540 CORAKCi IV ACTIONS Q27 The cause of the. event was not determined, however, the differential current rel'ay was suspected. Trouble shooting was conducted but no problems were found. Following testing, OCB 4E was successfull closed.

No unusual conditions were noted. The B offsite ower source was returnedI to service 41 hours4.74537e-4 days <br />0.0114 hours <br />6.779101e-5 weeks <br />1.56005e-5 months <br /> after being de-energized.

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