05000339/LER-1980-085-03, /03L-0:on 801127,while Operating in Mode 3,steam Flow Indications on Loop B,FI-2484 & FI-2485,differed from Each Other by 2.75 E+5 Lb/Hr.Caused by Circuit Card Being Out of Calibr.Card Replaced & Calibr

/03L-0:on 801127,while Operating in Mode 3,steam Flow Indications on Loop B,FI-2484 & FI-2485,differed from Each Other by 2.75 E+5 Lb/Hr.Caused by Circuit Card Being Out of Calibr.Card Replaced & Calibr

ML19345D732
Person / Time
Site:	North Anna
Issue date:	12/10/1980
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D726	List: 05000339/LER-1980-085, Forwards LER 80-085/03L-0 05000339/LER-1980-085-03, /03L-0:on 801127,while Operating in Mode 3,steam Flow Indications on Loop B,FI-2484 & FI-2485,differed from Each Other by 2.75 E+5 Lb/Hr.Caused by Circuit Card Being Out of Calibr.Card Replaced & Calibr
References
LER-80-085-03L-01, LER-80-85-3L-1, NUDOCS 8012160524
Download: ML19345D732 (2)

LER-1980-085, /03L-0:on 801127,while Operating in Mode 3,steam Flow Indications on Loop B,FI-2484 & FI-2485,differed from Each Other by 2.75 E+5 Lb/Hr.Caused by Circuit Card Being Out of Calibr.Card Replaced & Calibr

Event date:
Report date:
3391980085R03 - NRC Website

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U.S. NUCLEAR REGUL\\ TORY COMMISSION Jgg LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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/V/A/N/A/S/2/ (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 fh0RE [L/ (6) /0/5/0/0/0/3/3/9/ (7)

/1/1/2/7/8/0/

(8) /1/2 /1/o /8 /o / (9)

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

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On November 27, 1980 while operating in Mode 3, the steam flow indications on /

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loop B, FI-2484 and FI-2485, differed from each other by 2.75 E+5 lbs/hr.

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Since the operator placed protection channel IV in the trip mode, and there

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was a redundant protection channel available, the health and safety of the

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public were not affected. The applicable T.S. 3.3.2.1, and the event is

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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 SUBCODE SUBCODE

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/I/B/ (11) [E/ (12) [G/ (13) /I/N/S/T/R/U/ (14) /Y/ (15)

/Z/ (16)

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

CODE TYPE NO.

(17) REPORT NUMBER

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[-/ /0/8/5/

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/L/

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

/A/ (18) /Z/ (19)

/Z/ (20) [Z/ (21) /0/0/0/0/ (22) [Y/ (23) /N/ (24) /N/ (25) /W/1/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The cause of this discrepancy was a circuit card which was out of calibration. /

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The circuit card was replaced with a new one, calibrated by procedure, and

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the channel was restored to an operable status

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DESCRIPTION (32)

/ (30) DISCOVERY

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[G/ (28)

/0/0/0/ (29) /

NA [A/ (31)

/ OPERATOR OBSERVATION /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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/2/ (33)

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NA

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NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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NA

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PERSONNEL INJCRTES NL?iBER DESCRIPTION (41)

/1/8/ /0/0/0/ (40) /

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LOSS OF OR DAMAGE TO FACILITY (

}

TYPE

DESCRIPTION

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NA

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NA

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Virginia Electric and Power Company North Anna Power Staticn, Unit #2 Attachment: Page 1 of 1 Docket No. 50-339 Report No. LER 80-085/03L-0

Description of Event

On Novermber 27, 1980 while operating in Mode 3 the steam flow indications on loop B, FI-2484 and FI-2485, differed from each other by a flow rate greater than the allowable margin of 2.75 E+5 lbs/hr.

Probable Consequences of Occurrence Since the operator placed the appropriate channel, FI-2485, in the trip mode within one hour, and there was a redundant protection channel available, the health and safety of the public were not affected.

Cause of Event

The cause of this event was a multiplier / divider card which was out of calibration, reading 100 mvde too low. This caused the flow indicator FI-2485 to read 5.04 E+5 pph lower than the actual flow rate. This condition would also have caused the signal comparator card trip point for steam flow < feed flow to actuate later than desired by 5.04 E+5 h

PP.

Immediate Corrective Action

The immediate corrective action was to place the protection channel in the trip mode.

Scheduled Corrective Action 4

There are no scheduled corrective actions.

i Actions Taken to Prevent Recurrence The circuit card was repinced, calibrated per procedure and the channel restored to an operable status.

Generic Implications There are no generic implications.