05000338/LER-1981-054-03, /03L-0:on 810703,flow Indication for Auxiliary Feedwater Pump 3A Failed to Indicate Flow During Monthly Surveillance Test.Caused by Instrument Card in Power Supply Failure,Causing Input to Flow Indicator to Drop to Zero

/03L-0:on 810703,flow Indication for Auxiliary Feedwater Pump 3A Failed to Indicate Flow During Monthly Surveillance Test.Caused by Instrument Card in Power Supply Failure,Causing Input to Flow Indicator to Drop to Zero

ML20009F867
Person / Time
Site:	North Anna
Issue date:	07/22/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F866	List: 05000338/LER-1981-054, Forwards LER 81-054/03L-0 05000338/LER-1981-054-03, /03L-0:on 810703,flow Indication for Auxiliary Feedwater Pump 3A Failed to Indicate Flow During Monthly Surveillance Test.Caused by Instrument Card in Power Supply Failure,Causing Input to Flow Indicator to Drop to Zero
References
LER-81-054-03L-01, LER-81-54-3L-1, NUDOCS 8108030118
Download: ML20009F867 (2)

LER-1981-054, /03L-0:on 810703,flow Indication for Auxiliary Feedwater Pump 3A Failed to Indicate Flow During Monthly Surveillance Test.Caused by Instrument Card in Power Supply Failure,Causing Input to Flow Indicator to Drop to Zero

Event date:
Report date:
3381981054R03 - NRC Website

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LIC2NSE NUMBER LICENSE TYPE CAT

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

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/ On July 3, 1981 with Unit 1 at 85% power, it was discovered that the flow inlic- /

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/ ation for the 3A Auxiliary Feedwater Pump failed to indicate flow during the

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/ monthly surveillance test. The pump discharge flow was verified by a decrease

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/ in main feedwater flow with stable steam generator level.

The health and safety /

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/ of the general public were not affected.

This is contrary to T.S. 3.3.3.6 and

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/ reportable pursuant to T.S. 6.9.1.9.b.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODF SUBCODE

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

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

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/ An instrument card in the power supply for FT-FW-100C fai!cd causing t he input to/

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/ the flow indicator to drop to 0 volts.

Consequently, the indicator did not show /

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/ a flow. The power supply card was replaced and the flow indication was verified /

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/ to function correctly.

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FACILITY METHOD OF STATUS

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ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-3151 8108030118 810722 PDR ADOCK 05000338 S

PDR

_.- _= --..-_

..._= -..- - - - --

Virginia Electric and Power Company l

North Anna Power Station, Unit 1

Attachment:

Page 1 of 1 Docket No. 50-338 l

Report No. LER 81-054/03L-0

Description of Event

on July 3, 1981 with Unit 1 at 85% power, it was discovered that the flow indication for'the 3A Auxiliary Feedwater Pump failed to indicate flow. The indication failure was discovered while performing the monthly pump surveillance test.

Probable Consequences of Occurrence i

Since the 3A Auxiliary Feedwater Pump flow was verified by a t

decrease in main feedwater flow concurrent with a stable steam generator level and since the other two Auxiliary Feedwater Pumps were also available in the event of a loss of normal feedwater, the

[

health and safety of the general public were not affected.

{

Cause of Event

I The loss of indication was caused by the failure of an instrument card in the power supply for the flow transmitter. The power supply failed low causing the transmitter to indicatt no flow.

Immediate Corrective Action

The 3A Auxiliary Feedwater Pump was immediately verified to be operable by observing a decrease in the main feedwater flow.

The instru-l ment card was replaced and the flow indication was returned to service in less than 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.

l Scheduled Corrective Action No further corrective action is required.

Actions Taken to Prevent Reccurrence Not further action is required.

Generic Implications There are no generic implications.

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