ML19323H003

LER 80-028/03L-0:on 800504,power Was Lost to Vital Bus Inverter 4 Due to Blown Main Power Supply Fuse.Cause Unknown.Fuse & Rectifier Replaced.Frequency Adjusted

ML19323H003
Person / Time
Site:	Beaver Valley
Issue date:	06/02/1980
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323G997	List: ML19323G996 ML19323H001 ML19323H003
References
LER-80-028-03L, LER-80-28-3L, NUDOCS 8006090389
Download: ML19323H003 (1)

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U.S NUCLEAR REGULATORY COMMISSION m:Ponen m 778 1 LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI CONTROL BLOCK: l I

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] l 8P9 l A l B l V l S l 1 l@l 0 l0 l- l 0 l0 l0 l 0 l 0 l- l0 l 0 l@l4 l1 l1 l1 l1 l@l LICENSEE CODE 84 15 LICENSE NUM6ER JS 26 LICENSE TYPE 40 $7 CAT $4

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REP 3 u l L @l 0 l 5 l 0 l 0 l0 l 3 l 3 (4 @l 0151014 l 8 l 0 l@l 0 l 6 l O 60 68 OOCKET NUMBER 68 69 EVENT DATE le 76 REPORT DATE 80 EVENT DESC9IPTION AND PROBABLE CONSEQUENCES h ]

lost to the No. 4 Vital Bus Inverter due to ti.own main power supply fuse.

O121 1 Power wat -

l o # 3, I The vital bus power supply was switched to auxiliary supply and all alarms cleared.

I o 6 41 l The consequences 3re minimal due to the plant bein_g in Mode 5 with Solid State The plant has l l oIsl l Protection dee.~,;ized and the opposite train inverter in service.

.I LOjsj l experienced prior failures of this type. I 1

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80 l O 181 I

& S 9 SU E COMPONENT CODE SU8 COO'E DE CO E SUSC E O 9 l 11 Bl@ LE_j@ l A l@ l Zl Zl Zl Zl Zl Zlh [Zj@ l20Zl@13 is 19 9 to $1 12 REVISION 9 8 OCCURRENCE REPORT SEQUENTIAL TYPE NO.

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35 W@ l010l0lj 36 37 40 l41 N]@ I42N l@ 43 44 47 JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h lilOllThe apparent cause of the problem is unknown but there was a failed rectifier on thej The fuses]

i i Isingle phase bridge and the inverter frequency was in need of'adiustment.

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[ tty] lwere replaced, the rectifier was replaced, and the frequency was adjusted.

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1 n9 DISCOVERY DESCRIPTION dis RY OTHER STATUS SA  % POWER l R [._X,j@ l 0 l 0 l 0' l@l" Design l lAl@lOperatorobservation so cati 0n ** 4 *s

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REu .SE AocuNT cLCT,v,TY @I I N/A l s mEASED@0,OTTENT N/A "

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,E RSON~EL E xPOSSES NUu.ER Tv,E DESCRi,TiO~ @ l

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412-643-1258  ?

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