ML19345B463

LER 80-076/03L-0:on 801106,steam Generator Level Transmitter LT-486 Gave High Indication of 4.7%.Caused by Instrument Drift.Transmitter Recalibr

ML19345B463
Person / Time
Site:	North Anna
Issue date:	11/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345B455	List: ML19345B454 ML19345B463
References
LER-80-076-03L-01, LER-80-76-3L-1, NUDOCS 8012010359
Download: ML19345B463 (2)

Text

.

LICENSEE EVENT REPORT

~ CONTROL BLOCK /-/ / / / / / (1) (PLEASE _ PRINT OR TYPE A't REQUIRED IhTORMATION)

/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. LICFNSE NUMBER LICENSE TYPE CAT S E LL/ (6)- /0/5/0/0/0/3/3/9/ (7) /1/1/0/6/8/0/ (8) A A /2 /4 h h / (9)

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

/0/2/ / On November 6, 1980 while operating in Mode 5, an 18 month inspection test was /

/0/3/- / rerformed on the steam generator level transmitters during which it was /

/0/4/ :/ discovered that LT-486 gave indication that was high by 4.7% thereby providing/

/0/5/ / a non-conservative reading in the event of a low steam generator level. Since /

~/0/6/ / there were two redundant channels available to trip the reactor in the event /

/0/7/ / of a low steam generator level, the health and safety of the public were not /

/0/8/- / affected. /

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

/0/9/ /I/A/ (11) LE/ (12) LE/ (13) /I/N/S/T/R/U/ (14) E/ (15) LZ/ (16)

SEQUENTIAL OCCURRENCE REPORT REVISION

, LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT NUMBER /8/0/ /-/ /0/7/6/ /\/ /0/3/ LL/ /-/ /0/

ACTION FUTURE EFFECY SHUTL .d ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLAhT MElh0D HOURS SUEMITTED FORM SUB. SUPPLIER MANUFACTURER LE/ (18) LZ/ (19) LZ/ (20) [Z/ (21) /0/0/0/0/ (22) g/ (23) LN/ (24) LN/ (25) /W/1/2/0/-(26) '

CAU2 DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The cause of this event was instrument drift. The corrective action was to /

/1/1/ / 'recalibrate the transmitter by procedure and verify that it provides proper /

/1/2/ / indication. /

-/1/3/ / /

/1/4/ / /

FACILITY METHOD OF STAT'JS  % POWER' OTHER STATUS DISC M RY DESCR W ON (32)

/1/5/ /G/_(28) /0/0/0/ (29) / NA /-(30) DIS LB/N RY (31) /18 MONTH RECALIBRATION PROC./

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

/1/6/ LZ/-(33) 'LZ/ (34)' / NA / / NA .'

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

-/1/7/ /0/0/0/ (37) LZ[ (38) '/ NA _ _ _ _ /

PERSONNEL INJURIES NUMBER DESCRIPTION (41) l

. /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 1/2/0/ /N/.(44). / NA / ////////////

NAME OF PREPARER W. R.~ CARTWRIGHT PHONE T703) 894-5151-8012010 M

c

-Virginia Electric and Power Company North Anna Power Station, Unit #2

Attachment:

Page 1 of 1-Docket No'. 50-339 Report No. LER 80-076/03L-0 Description of Event On November 6,1980 while operatingLin Mode 5, an 18 month inspection r test was performed on the steam generator level transmitters during wbich it was discovered that-LT-486 gave indication that was high by I

4. .%,. thereby providing a non-conservative reading in the event of a -low l~ steam generator level. The applicable T.S. is 3 3 . . 1

. 1 , and'the event is

-reportable pursuant to T.S. 6.9.1.9.a.

4 Probable Consequences of Occurrence Since there were_two. redundant channels available to trip the reactor in the event of a low steam generator level, the health and i safety of the-public were not affected.

Cause of Event The cause of this event'was instrument drift.

Immediate Corrective Action The immediate corrective action was to recalibrate the transmitter and verify that it provides proper indication.

Scheduled Coct.ctive Action There are no scheduled corrective actions.

Actions Taken to Prevent Recurrence No .further ' actions are required.

f Generic Imolications-4 There are no generic implications.

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