ML19289F544

LER 79-074/03L-0 on 790516:pressurizer Level Indicator L-1460 Failed During Performance of 1-PT-31.7.2.Cause Unknown.Wires Reconnected & Surveillance Undertaken

ML19289F544
Person / Time
Site:	North Anna
Issue date:	06/04/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19289F541	List: ML19289F540 ML19289F543 ML19289F544
References
LER-79-074-03L, LER-79-74-3L, NUDOCS 7906110162
Download: ML19289F544 (2)

Text

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• GJ til DOC < E T NUV 4 6 H 08 U EVENT DATE tvENT DEscn6PTION AND PROBABLE CONSEQUENCES h o 2 [ During the performance of PT-31.7.2, at steady state operation, pressurizer level o 3 l indicator L-1460 failed high. This is contrary to T.S. 3.3.1.1. Action Statement #7 I to a [of T.S. 3.3.1.1 was entered and the channel was left in the tripped condition. This I o 3  ; event is reportable as per T.S. 6.9.1.9.b. .

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-074/03L-0 Description of Event On 5-16-79, at steady state operation, during the performance of 1-PT-31.7.2, the pressurizer level indicator L-1460 failed high. This is contrary to T.S. 3.3.1.1. Action Statement #7 of the Tech. Spec. was entered and the transmitter was left in the tripped condition. This event is reportable as per T.S. 6.9.1.9.b. Probable Consequences of Occurrence , The operability of the protective instrumentation systems and interlocks ensure that 1), the associated reactor trip will be initiated when the parameter monitored by each channel or combination thereof exceeds its setpoint, 2) the specified coincidence logic is maintained, 3) sufficient redundancy is maintained to permit a channel to be out of service for testing or maintenance, and 4) suf-ficient system functional capability is available for protective and ESF purposes from diverse parameters. Since the level indicator was in the trip mode when it failed high and the minimum number of channels were operable, the safe operation of the plant was not affected. At no time was the safety and health of the public endangered. There are no generic implications for this item. Cause of Event Since the transmitter was operable before the performance of the test and failed while in the test position, the cause of the event is unknown at this time. Immediate Corrective Action A functional test was performed and passed on the transmitter. The instru-ment wires were reconnected and the transmitter returned to operability. Scheduled Corrective Action Surveillance of the transmitter was continued and the transmitter continued to perform correctly. Actions Taken To Prevent Recurrences No further action taken at this time. 2230 35i

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