ML19341B290

LER 80-100/03L-0:on 801211,with Unit in Mode 3,RC Loop a Tave Protection Annuniciator Locked in Actual Tave Indicating 547 F & Protective Channel 1A Tave (TI-2412D) Indicating 544 F.Cause Unknown.Channel 1A Recalibr

ML19341B290
Person / Time
Site:	North Anna
Issue date:	01/09/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341B282	List: ML19341B281 ML19341B290
References
LER-80-100-03L-01, LER-80-100-3L-1, NUDOCS 8101300597
Download: ML19341B290 (2)

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l U.S. NUCLEAR REGULATORY COMMISSION 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

/

f/L/(6)

~

/0/5/0/0/0/3/3/9/ (7)

DOCKET NUMBER

/1/2/1/1/8/0/ (8) /o A h /9 /s A / (9)

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

/0/2/ / On December 11, 1980, with the unit in mode 3, RC Loop A Tave Protection /

/0/3/ / Channel 1A LO LO Tave annunciator locked in with actual Tave indicating 547 F /

/0/4/ / and Protection Channel IA Tave (TI 2412D) indicating 544*F. The failed channel /

/0/5/ / was placed in the trip mode. Redundant channels remained operable, therefore /

/0/6/ / the health and safety of the general public were not affected. This event is /

/0/7/ / contrary to T.S. 3.3.2 and 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) g/ (15) /_Z/ (16)

SEQUENT!AL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO. CODE TYPE NO.

(17) REPORT NUMBER /8/0/ /-/ /1/0/0/ /\/ /0/3/ g/ /-/ [0/

ACTION FUTURE EFFECT ShT 30WN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER

[E/ (18) g/ (19) g/ (20) g/ (21) /0/0/0/0/ (22) g/ (23) g/ (24) g/ (25) /R/3/6/9/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

/1/0/ / The cause of the failure is not known at this time. The failed channel was /

/1/1/ / placed in the trip mode within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and an Emergency Maintenance Request /

/1/2/ / was submitted. The channel was recalibrated satisfactorily and returned to /

/1/3/ / service. /

/1/4/ / /

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

/1/5/ /B/ (28) /0/0/0/ (29) / NA / (30) DISCOVERY g/ (31) / OPERATOR OBSERVATION /

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

/1/6/ g/ (33) g/ (34) / NA / / NA /

PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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

PERSONNEL INJ0iiTES NUMBER DESCRIPTION (41)

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

LOSS TYPE OF OR DAMAGE TO FACILITY (43)

DESCRIPTION

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

PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

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

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 l 8101800l[77

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

Attachment:

Page 1 of 1 Docket No. 50-339 Report No. LER 80-100/03L-0 Description of Event On December 11, 1980, with the unit in mode 3, RC Loop A Tave Protection Channel 1A LoLo Tave annunciator locked in with actual Tave indicating 547*F and protection channel 1A tave (TI-2412D) indicating 544'F.

Probable Consequences of Occurrence The failed channel was placed in the trip mode within I hour as required by the action statement. Since there were redundant channels available from RC Laops E and C, the health and safety of the general public were not affected.

Cause of Event The cause of the failure is not known at this time. The calibration of the channels that supply Tave Protection Channel 1A he, c=tisfactory and all readings were within the required specificatica.

Immediate Corrective Action Upon discovery of this event the channel was placed in the trip mode within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and a Deviation Report and Emergency Maintenance Request were submitted. The channels supplying Tave Protection Channel 1A were recalibrated satisfactorily and the channel was placed back into service.

Scheduled Corrective Action No further corrective action is required.

Actions Taken to Prevent Recurrence No action is required.

Generic Implications There are no generic implications associated with this event.

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