05000317/LER-1980-031-03, /03L-0:on 800625,high Oil Temp Alarm Received on 4 Kv Unit Svc Transformer.Caused by Failure of Cooling Fans Due to Blown Fuse in Control Circuit.Fan Did Not Transfer to Backup Power Supply.Cause Unknown.Fuse Replaced

/03L-0:on 800625,high Oil Temp Alarm Received on 4 Kv Unit Svc Transformer.Caused by Failure of Cooling Fans Due to Blown Fuse in Control Circuit.Fan Did Not Transfer to Backup Power Supply.Cause Unknown.Fuse Replaced

ML19330A510
Person / Time
Site:	Calvert Cliffs
Issue date:	07/18/1980
From:	Bauer E, Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19330A507	List: 05000317/LER-1980-031, Forwards LER 80-031/03L-0 05000317/LER-1980-031-03, /03L-0:on 800625,high Oil Temp Alarm Received on 4 Kv Unit Svc Transformer.Caused by Failure of Cooling Fans Due to Blown Fuse in Control Circuit.Fan Did Not Transfer to Backup Power Supply.Cause Unknown.Fuse Replaced
References
LER-80-031-03L-01, LER-80-31-3L-1, NUDOCS 8007280453
Download: ML19330A510 (1)

LER-1980-031, /03L-0:on 800625,high Oil Temp Alarm Received on 4 Kv Unit Svc Transformer.Caused by Failure of Cooling Fans Due to Blown Fuse in Control Circuit.Fan Did Not Transfer to Backup Power Supply.Cause Unknown.Fuse Replaced

Event date:
Report date:
3171980031R03 - NRC Website

text

NRC FORM 366 w. r,. nwussan n su vi,m. wn. ww

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 9 LICENSEE CODE 14 15 LICENSE NUMSER 25 26 LICENSE TYPE JO

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT CATE do EVENT DESCRIPTION AND PROBABLE CONSEQUtiNCEs h lo 121 l At 2000 a hiah oil temoerature alam was received on 4 KV unit service I

l o t a l I transfomer U-4000-11. An investication revealed that the coolino fans had I

lo 141 I stopped and could not be restarted. All electrical loads were transfered I

t o i s i i to service transfomer U-4000-21 and the transfomer was placed out of service I

i O is i I per T.S. 3.8.1.1.a.

Both entergency diesel generators and the redundant service l

1 o 17 l 1 transfomer remained operable. The transfomer was returned to service at 2200.

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10 :41 l This is not a repetitive occurrence.

I CE CO E SLBCO E COMPCNENT CODE SL8 CODE S

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPCRT REVISICN gq EV ENT YE A R REPORT NO.

CODE TYPE N O.

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33 34 25 26 37 40 41 42 43 44 47 CAUSE DESCRIPTICN AND CORRECTnVE ACTtoNS h li i o l l A fuse had blown in the transfomer coolino fan control circuit and the fan I

ii ii i i did not transfer to the back-uo power sucoly. With the fuse reolaced, the 1

11 12i I circuit was successfully tested six times.

The cause for the failed fusa is I

sii3i l unknown. The preventive maintenance card will be rewritten to test the transfer l

1ii4i i circuit annually.

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8 9 80 STA

% POWER OTHER STATUS 015 RY OtSCOVERY OESCR:PTION It Is l l El@ ll 1010 l@l NA l

[A.j@l us,,h Tar'oeratura a l a.-,

I ACTIVITY CO TENT RELEASED OP RELEASE AMOUNT 08 ACTIVITY LOCATION OF RELEASE l1 l6llZl@lZI@l NA l

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7 8 9 10 11 44 45 So PERSONNEL EXPOSURES NUM8ER TYPE

DESCRIPTION

l 1 l 71 101010 @W@l nlA l

PERSONNEL INJU IE3 NUVSER D ESCRIPTION

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7 8 9 11 12 80 TY E CESCR PT C na I

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8 9 10 68 69 80 5 PHCNE: (301 W a7a9 /A7??

S. M. Davis /E R. Bauer NAME OF PREPARER