05000339/LER-1981-016-03, /03L-0:on 810205,temp Indicator TI-412D Associated W/Tavg Protection for Loop A,Was Reading Approx 5-15 F Low & Responding Erratically.Caused by Failed Relay Card.Card Replaced,Calibr & Returned to Svc

/03L-0:on 810205,temp Indicator TI-412D Associated W/Tavg Protection for Loop A,Was Reading Approx 5-15 F Low & Responding Erratically.Caused by Failed Relay Card.Card Replaced,Calibr & Returned to Svc

ML20003B827
Person / Time
Site:	North Anna
Issue date:	02/19/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003B825	List: 05000339/LER-1981-016, Forwards LER 81-016/03L-0 05000339/LER-1981-016-03, /03L-0:on 810205,temp Indicator TI-412D Associated W/Tavg Protection for Loop A,Was Reading Approx 5-15 F Low & Responding Erratically.Caused by Failed Relay Card.Card Replaced,Calibr & Returned to Svc
References
LER-81-016-03L, LER-81-16-3L, NUDOCS 8102250636
Download: ML20003B827 (2)

LER-1981-016, /03L-0:on 810205,temp Indicator TI-412D Associated W/Tavg Protection for Loop A,Was Reading Approx 5-15 F Low & Responding Erratically.Caused by Failed Relay Card.Card Replaced,Calibr & Returned to Svc

Event date:
Report date:
3391981016R03 - NRC Website

text

.

LICENSEE E\\ INT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED 15TORMATION)

/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

/L/ (6)

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

/0/2/0/5/S/1/

(8) / O/ 2/1/ 9/ al1/ (9)

'P E DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

/0/2/

/ On Februarv 5, 1981, while operating at 100*, power, the temperature indicator

/

/0/3/

/ (TI-412D), associated with Tavg Protection for Loop A, was reading approximately /

/0/4/

/ 5'F-15'F low and responding erratically af ter being placed in service upon

/

/0/5/

/ completion of a pericdic test on the channel. Since the affected channel was

/

/0/6/

/ placed in the trip condition within one hour, the public health and safety were /

/0/7/

/ not affected.

/

/0/8/

/ __

/

SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

/0/9/

/I/A/ (11) /E/ (12) /E/ (13) /I/N/S/T/R/U/ (14) /X/ (15)

/Z/ (16)

SEQUESTIAL OCCURRENCE REPORT REVISION LER/R0 EiT.NT YEAR REPORT NO.

CODE TYPE N0.

(17) REPORT NUMBER

/8/1/

/-/ /0/1/6/

/\\/

/0/3/

/L/

/-/

/0/

ACTION FLTURE EFFECT SHUTDOWN ATTACHMENT KPRD-4 PRIME COMP. COMPOST.hT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MA51TACTURER

/_A/, (IS) /Z/ (19) /2/ (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) i

/1/0/

/ The erratic and Icwer than normal readings on the temperature indicator s.ere

/

/1/1/

/ caused oy a failed relay card. The card was replaced, calibrated and returned

/

/1/2/

/ to service.

/

/1/3/

/

/

/1/4/

/

/

FACILITY METHOD OF STATUS

• POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

/1/5/

/F/ (28)

/1/0/0/ (29) /

NA

/ (30) /A/ (31) / Operator Observation /

ACTIVITY CONTENT RELEASED OF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

/Z/ (33)

/Z/ (34) /

NA

/

NA

/

PERSONNEL EXPOSURES NUMBER n?F DESCRIPTION (39)

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

NA

/

PERSONNEI IJLW ES NUMBER DESCRIPTION (41)

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

NA

/

LOSS OF OR DAMAGE TO FACILITY (43)

TYPE DESCRIP' ION

/1/9/

/2/ (42) /

NA

/

PLSLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

/2/0/

/N/ (44) /

NA

/////////////

NAME OF PREPARER W. R. CARTVRIGHT PHONE (703) 894-5151 81022sobsts

1 Virginia Electric and Power Company North Anna Power Station, Unit 2

Attachment:

Page 1 of 1 Docket No. 50-339 i

Report No. LER 81-016/03L-0

Description of Event

On February 5,1981, while operating in Mode 1 at 100% power the temperature indicator (TI412D), associated with T-AVG protection for Loop A, was reading erratically and approximately 5*F-15*F low after being placed back in service upon completion of a periodic test on that protection channel. This event is reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occuregnce Since two redundant protection channels remained available to initiate the appropriate safeguarda and reactor protection actuation if required, and the affected channel was placed in trip within one hour, the health and safety of the public were not affected.

Cause of Event

The affected T-AVG protection channel was reading low and erratically due to a failed relay card within the circuit.

Immediate Corrective Action

The immediate corrective action was to place the T-AVG protect 4.on channel in a trip condition. After finding the problem to be a fa'ted relay card, the card was replaced, calibrated and the loop returned to service in accordance with the appropriate calibration procedure.

Scheduled Corrective Action No further corrective action scheduled.

i Actions Taken to Prevent Recurrence No further action needed.

Generic Implications There are no generic implications to this event.

i e

6