05000339/LER-1980-063-03, /03L-0:on 800920,during Performance of incore- Excore Detector Calibr Startup Test,Found Zero Point Shift of Delta T/T Avg Channel III Summing Amp.Cause Undetermined. Channel Placed in Trip & New Summing Amp Installed

/03L-0:on 800920,during Performance of incore- Excore Detector Calibr Startup Test,Found Zero Point Shift of Delta T/T Avg Channel III Summing Amp.Cause Undetermined. Channel Placed in Trip & New Summing Amp Installed

ML19338F105
Person / Time
Site:	North Anna
Issue date:	10/01/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338F092	List: 05000339/LER-1980-063, Forwards LER 80-063/03L-0 05000339/LER-1980-063-03, /03L-0:on 800920,during Performance of incore- Excore Detector Calibr Startup Test,Found Zero Point Shift of Delta T/T Avg Channel III Summing Amp.Cause Undetermined. Channel Placed in Trip & New Summing Amp Installed
References
LER-80-063-03L, LER-80-63-3L, NUDOCS 8010070525
Download: ML19338F105 (2)

LER-1980-063, /03L-0:on 800920,during Performance of incore- Excore Detector Calibr Startup Test,Found Zero Point Shift of Delta T/T Avg Channel III Summing Amp.Cause Undetermined. Channel Placed in Trip & New Summing Amp Installed

Event date:
Report date:
3391980063R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

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E DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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During the performance of an incore-eycore detector calibration startup test,

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a zero point shift in a DELTA T/T AVG channel III axial flux difference sum-

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ming amp was discovered. Nonconservative channel III Overtemperature Delta T /

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setpoints could have resulted. This event is reportable pursuant to T.S.

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6.9.1.9.b.

Two redundant channels were operable and the effected channel was /

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placed in trip; therefore, the public health and safety were not affected.

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The cause of the zero shift in the summing amp was not determined. The channel /

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was placed in trip immediately, a new summing amp installed and calibrated, and/

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the channel returned to operable status. No further corrective actions are

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STARTUP TESTING

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NAME OF PREPARER W. R. CARWRIGHT PHONE (703) 894-5151 8010070525

Virginia Electric and Power Company North Anna Power Station, Unit 2

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 80-063/03L-0

Description of Event

During the performance of an incore - excore detector calibration startup test, a zero point shift of a DELTA T/T AVG channel III axial flux difference summing amp was discovered. A maximum channel III error of +16% (nonconservative) in the Overtemperature Delta T trip, turbine runback, and control rod withdrawal block setpoints could have resulted for a positive axial flux difference. A maximum channel III error of

- 38.7% (conservative) in the Overtemperature Delta T trip, turbine runback, and control rod withdrawal block setpoints could have resulted for a negative axial flux difference. This event is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence DELTA T/T AVG channels I and II were operable. The action statement of the LCO was met.

The public health and safety were not affected.

Cause of Event

The cause of the zero shift in the summing amp was not determined.

Immediate Corrective Actions

The channel was placed in trip, a new summing amp installed and calibrated, and the channel returned to operable status.

Scheduled Corrective Action No scheduled corrective actions are required.

Actions Taken to Prevent Recurrence j

No actions to prevent recurrence are required.

Generic Implications This event had no generic implications.

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