ML19345D732

LER 80-085/03L-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

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: ML19345D725 ML19345D732
References
LER-80-085-03L-01, LER-80-85-3L-1, NUDOCS 8012160524
Download: ML19345D732 (2)

Text

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U.S. NUCLEAR REGUL\ TORY COMMISSION Jgg LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1) (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

/0/1/ /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

/0/5/0/0/0/3/3/9/ (7) fh0RE [L/ (6) DOCKET /1/1/2/7/8/0/ (8) /1/2 /1/o /8 /o / (9)

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

/0/2/ / On November 27, 1980 while operating in Mode 3, the steam flow indications on /

/0/3/ / loop B, FI-2484 and FI-2485, differed from each other by 2.75 E+5 lbs/hr. /

/0/4/ / Since the operator placed protection channel IV in the trip mode, and there /

/0/5/ / was a redundant protection channel available, the health and safety of the /

/0/6/ / public were not affected. The applicable T.S. 3.3.2.1, and the event is /

/0/7/ / reportable pursuant to T.S. 6.9.1.9.b. /

/0/8/ / / '

SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/ /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 /8/0/ [-/ /0/8/5/ /\/ /0/3/ /L/ /-/ /0/

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)

/1/0/ / The cause of this discrepancy was a circuit card which was out of calibration. /

/1/1/ / The circuit card was replaced with a new one, calibrated by procedure, and /

/1/2/ / the channel was restored to an operable status /

/1/3/ / /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DESCRIPTION (32)

/1/5/ [G/ (28) /0/0/0/ (29) / NA / (30) DISCOVERY

[A/ (31) / OPERATOR OBSERVATION /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35) LOCATION OF RELEASE (36)

/1/6/ /2/ (33) /Z/ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) /Z/ (38) / NA /

PERSONNEL INJCRTES NL?iBER DESCRIPTION (41)

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

LOSS TYPE OF OR DAMAGE TO FACILITY DESCRIPTION

} (

/1/9/ /Z[ (42) / NA /

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

/2/0/ /N/ (44) / NA //// /////////

26D$$h3f

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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 PPh .

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.

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