05000339/LER-1980-075-03, /03L-0:on 801123,loop a Flow Transmitter FT-2415 Found to Be 2.39% Higher than Tech Spec Requirement.Caused by Instrument Drift.Transmitter Recalibr & Verified

/03L-0:on 801123,loop a Flow Transmitter FT-2415 Found to Be 2.39% Higher than Tech Spec Requirement.Caused by Instrument Drift.Transmitter Recalibr & Verified

ML19345D476
Person / Time
Site:	North Anna
Issue date:	12/04/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D473	List: 05000339/LER-1980-075, Forwards LER 80-075/03L-0 05000339/LER-1980-075-03, /03L-0:on 801123,loop a Flow Transmitter FT-2415 Found to Be 2.39% Higher than Tech Spec Requirement.Caused by Instrument Drift.Transmitter Recalibr & Verified
References
LER-80-075-03L-01, LER-80-75-3L-1, NUDOCS 8012150176
Download: ML19345D476 (2)

LER-1980-075, /03L-0:on 801123,loop a Flow Transmitter FT-2415 Found to Be 2.39% Higher than Tech Spec Requirement.Caused by Instrument Drift.Transmitter Recalibr & Verified

Event date:
Report date:
3391980075R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

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LICENSEE CODE LICENSE NUMBER

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

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During an 18 month recalibration test, a flow transmitter on loop A, FT-2415, /

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was discovered to be 2.39% higher than req' ired by T.S.3.3.1.1 in order for

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it to initiate a reactor trip at 89% of the design flow rate.

Since the trans-/

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mitter was recalibrated immediately, and there were two redundant transmitters /

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in the A loop available to trip the reactor on a loss of flow, the health and /

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safety of the public were not affected. Reportable pursuant to T.S. 6.9.1.9.a./

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SYSTEM

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HCURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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N CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The cause of this event is due to instrument drift. The corrective action was /

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to recalibrate the transmitter by procedure, and verify that it is reading

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properly.

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FACILITY METHOD OF STATUS

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LOSS OF OR DAMAGE TO FACILITY M3)

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NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 l

8012150G{o

j Virginia Electric and Power Company North Anna Power Station, Unit 2 Attachment: Page 1 of 1 Docker No. 50-339 Report No. LER 80-075/03L-0 i

Description of Event

While operating in hede 5, an 18 month recalibration test was performed during which a flow transmitter, FT-2415, was discovered to be 2.39% higher than required by T.S. 3.3.1.1 in order for it to initiate a reactor trip at 89% of the design flow rate.

Probable Consequences of Occurrence Since the transmitter was recalibrated immediately, and there were.

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two redundant transmitters in the A loop to trip the reactor on a loss of flow, the health and safety of the public were not affected.

Cause of Event

The cause of the event is due to instrument drift.

Immediate Corrective Action

The immediate corrective action was to recalibrate the transmitter and verify that is was set properly.

4 Scheduled Corrective Action There are no scheduled corrective actions.

Actions Taken to Prevent Reccurrence No further action is required.

Generic Implications There are no generic implications.

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