ML20064G434

/03X-1 on 781012:during Mode 1 Opers,At 100% Pwr, Feedwater Flow Transmitter FT-1496 on Feedwater Loop C Failed Low.Caused by Blown Fuse.Fuse Subsequently Replaced

ML20064G434
Person / Time
Site:	North Anna
Issue date:	12/05/1978
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML20064G432	List: ML20064G428 ML20064G434
References
LER-78-108-03X, LER-78-108-3X, NUDOCS 7812110192
Download: ML20064G434 (2)

Text

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7 8 80 88 69 EVENT DATE REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h O 2 l During Mode 1 operations, at 100% power, feedwater flow transmitter FT-1496 on I o 3  ; Feedwater Loop C, failed low due to a blown fuse. Since one of two feedwater channelsl o , i failed low, the failed channel was placed into the trip condition. Reportable as per i o 3 i T.S. 6.9.1.9.b. l ITTTIi 1 ITITl l I I

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, o lThe failure of FI-1496 was due to a blown power fuse. The blown fuse was replaced. I i i l I i 2 I I IT . I I I i 4 I I

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Attachment:

Page 1 of 1 Docket No: 50-338 Report NO. LER 78-108/03-X-1 Description of Event  ;

During Mode 1 operations, at 100% power, feedwater flow transmitter FI-1436 on Feedwater Loop C failed low. This being a 2 channel loop and with the other channel being operable, the flow control function was shifted to an alternate flow meter.

Probable Consequences of Event  ;

Since one of two feedwater channels failed low, the failed channel was i

<- placed into the trip condition. This trip is actuated by a steam /feedwater '

( flow mismatch (one out of two) in coincidence with low water level (one of  ;

two) in any steam generator. Since the redundant channel was still operable, ,

no loss of protective function was incurred, therefore the public safety was not endangered. It was necessary to shift the control function to another channel.

Cause The flow indicator failure was due to a blown power fuse.

Immediate Corrective Action The fuse wov replaced.

Scheduled Corrective Action

( No further action required.  !

Action Taken to Prevent Recurrence i No further action required.

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