ML20010C540

LER 81-046/03L-0:on 810714,during Normal Operation 120 Ac Vital Bus 3 Was de-energized When Power Was Interrupted at a Inverter.Caused by Station Battery Shorting During Maint Causing a Inverter to Fail

ML20010C540
Person / Time
Site:	Crystal River
Issue date:	08/12/1981
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010C526	List: ML20010C525 ML20010C540
References
LER-81-046-03L, LER-81-46-3L, NUDOCS 8108200174
Download: ML20010C540 (2)

Text

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i 8 60 of DOCK ET NUMBER 68 69 EVENT DATE lb EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l o [ 2 l l At 0954 during normal operation 120 A.C. Vital Bus #3A was de-eneroined when power an]

go;3; j interrupted at tha "A" inverter. This created an event contrary to T.S.3.8.2.1. An  !

QTT] la result of this event.a Reactor / Turbine trip occurred. Power was restor ed to 1-he l lol3l l Vital Bus within ten minutes. There was no effect utx>n the health or safety of the 1

[ o lc,1 l general public. This was the first event of this type.and this is the fif t h event-l l 017 l l reported under this specification. I l O lH ] l 7 8 9 00 SYST E M CAUSE CAUSE COMP. VALVE CODE CODE SUBLODE COMPONENT CODE SUBCODE SUBCODE 1019I I E j C lh ( Ajh [C_j h lB l A lT lT lR lY lh l Z lh (Jd h 20 7 8 9 10 11 12 13 18 19 SEQUE NYl AL OCCURRENCE REPOHT REVISION

,,,, EVENT YE AR HE POH T NO. CODE TYPE NO.

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_ 21 22 2J 24 26 27 2H 23 Ju 31 32 ACTION FUTURE EFFECT SHUTDOWN ATT ACHME N T N P R O-4 PRIMF COMP. COMPONENT 7 TAKEN ACTION ON PL ANT METHOD HOURS 14 SUOMI TT E D FOHM dVB. SUPPLIE R MANUFACTUREH L; Lx.J@L2J@ La_J@ Lc_JO I o lo 11 13 I I vl@ LnJO LzJ@ lcI,I7I,l@

JJ 34 J3 36 3/ 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i j o l lThe cause of this event is attributed to inadvertent shorting of the "A" Station l i i [ Battery during maintenance resulting in failure of the "A" Inverter which was supplying l

, j [ power to the Vital Bus. THe inverter was repaired. Mainten ce in the battery room ,

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[ij3l lwill utilize tools with insulated handles,and of a length designed to prevent shorting l i 4 [and caution signs will be posted at the entran(.e. l 7 8 9 80 ST S  % POWE H OTER STATUS I C V H DISCOVEHY DESCHIPTION i 5

{ @ l0l8l0lQ NA l l Al@l Operator Observat. ion l A TlVITY CO TENT RELE ASED OF RELE ASE AMOUNT OF ACTivlTY LOCATION OF RELE ASE NA l l NA l l : l 0N l9 l Z l @ 10[ Z]@l 1 11 44 45 80 PE HSONNE L F XPOSUHES NUYHEH TYPf DESCRIPTION '-

7 i i H 9 lo lo lo l@l zl@l 11 12 13 NA 80 l

PEHSONNE L INJUHICS NUMBE R DESCnt P flON NA li la 819 lo lo lo l@l

/ 11 12 80 l

LOSS OF OH DAMAGE TO FAClliTY '

TYPE DE SC RIP T ION NA 7

9 N 9 lZl@l 10 80 l

ISSUE D

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to 68 69 80 .

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SUPPIDENTARY INFORMATION . .

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Report #50-302/81-046/03Ir0 ,

Facility: Crystal River Unit 3

' Report Date: ' August '12,1981.

Occurrence Date: July; 14,1981  ;

-Identification of. Occurrence

120 Volt A.C. Vital Bus #3A was inoperable contrary . to

Technical Specifica* ion 3 8.2.1.

t Conditions Prior to Occurrence:

1 Mode 1 - Power Operation (8Q$)

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Description of Occurrence:

At 0954 during normal operation ,120 volt A.C._ Vital Bus #3A was de-energized. -The "A" station battery was . shorted

, during maintenance which blew the output fuse of the "A" inverter which supplied the bus. As a result of the lost

. bus the interface' valve for the turbine generator. control 3

fluid opened causing a loss of control fluid resulting in a Turbine / Reactor trip. Power was restored to the Vital Bus within ten (10) minutes.

Designation of Apparent Cause:

L The cause of. this event is attributed .to a personnel error j resulting in the short to the battery.

Analysis of Occurrence:

There was no effect upon the health or safety of the general public.

Correctivr, Action:

The "A" Inverter was repaired. Tools with insulated handles ,

and of a length designed to prevent shorting will be

'obtained for exclusive use in the _ Battery _ Room.

Additionally, a sign will be installed on the - door to - the Battery Room to.. provide sensitive equipment caution to persons entering.

Failure Data:

L- ' This was the- first event of this type,and this . is the fifth

! event reported under this specification. '

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