05000338/LER-1980-050-03, /03L-0:on 800531,during Steam Generator 1A Channel 3 Narrow Range Level Transmitter Recalibr,Determined That Transmitter Had Drifted 3% High.Caused by Normal Instrument Drift.Transmitter Recalibr Immediately

/03L-0:on 800531,during Steam Generator 1A Channel 3 Narrow Range Level Transmitter Recalibr,Determined That Transmitter Had Drifted 3% High.Caused by Normal Instrument Drift.Transmitter Recalibr Immediately

ML19326D753
Person / Time
Site:	North Anna
Issue date:	06/30/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19326D752	List: 05000338/LER-1980-050, Forwards LER 80-050/03L-0 05000338/LER-1980-050-03, /03L-0:on 800531,during Steam Generator 1A Channel 3 Narrow Range Level Transmitter Recalibr,Determined That Transmitter Had Drifted 3% High.Caused by Normal Instrument Drift.Transmitter Recalibr Immediately
References
LER-80-050-03L, LER-80-50-3L, NUDOCS 8007030271
Download: ML19326D753 (2)

LER-1980-050, /03L-0:on 800531,during Steam Generator 1A Channel 3 Narrow Range Level Transmitter Recalibr,Determined That Transmitter Had Drifted 3% High.Caused by Normal Instrument Drift.Transmitter Recalibr Immediately

Event date:
Report date:
3381980050R03 - NRC Website

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/V/A/N/A/S/1/ (2)

/0/0/-/0/0/0/0/0/-/0/0/ (3)

/4/1/1/1/1 (4)

/ / /_ (5)

LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

/L/ (6)

/0/5/0/0/0/3/3/8/

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

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On May 31, 1980, during scheduled recalibration of Steam Generator IA channel /

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III narrow range level transmitter, instrumentation personnel determined the

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transmitter had drifted 3% high._ This would ha_ve_ delayed the channel _III input /

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to low steam generator level protection logies. This event _is reportable _pur- /

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suant to T.S. 6.9.1.9.a.

The minimum number of Steam Generator 1A narrow range /

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level channels required by the T.S. were operable and in calibration; there-

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fore, the public health and safety were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUbCODE COMPONENT CODE SUBCODE SUBCODE

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/I/A/ (11) /X/ (12) LZ/_ (13) /I/N/S/T/R/U/ (14) /T/ (15)

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SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP.

COMPONENT TAI:EN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The channel III Steam Generator IA narrow range level transmitter was recali- /

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brated immediately. The cause was normal instrument drift, therefore, no

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further corrective action is scheduled.

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FACILITY METHOD OF STATUS

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/0/0/0/,(29) L NA

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ACTIVITY CONIT.NT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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LZf (34)

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NA

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NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY (43)

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY 8007000 2

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murumrrrrre n a u m re m s e mee canm-un

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

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 80-050/03L-0

Description of Event

On May 31, 1980, during scheduled recalibration of Steam Generator IA channel III narrow range level transmitter, instrumentatio; nersonnel determined that the transmitter had drifted 3% high. This would have delayed the channel III input to low steam 8cnerator level protection J

logica; therefore, this event is reportable pursuant to T.S. 6.9.1.9.a.

Probable Consequences of Occurrence Steam Generator IA narrow range level channels I and II were oper-able and in calibration.

Channel III Steam Generator IA narrow range level transmitter was recalibrated immediately.

Since the minimum number of Steam Generator IA narrow range channels required by the Technical Specifications were operable and in calibration and the chan-nel III narrow range level transmitter was recalibrated immediately, the public health and safety were not affected.

Cause of Event

The cause of the instrument drift was not determined.

Immediate Corrective Action

Channel III Steam Generator IA narrow range level transmitter was recalibrated Lamediately.

Scheduled Corrective Action

)

No scheduled corrective actions are required.

Actions Taken to Prevent Recurrence No actions to prevent recurrance are required.

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