ML20028G013

LER 83-011/03L-0:on 821119,individual Rod Position Indication Deviated from Group Demand Position by Greater than 12 Steps.Caused by Instrument Drift.Indicator Channel for Rods B-09 & 02 & F-06 Recalibr

ML20028G013
Person / Time
Site:	North Anna
Issue date:	01/28/1983
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028G010	List: ML20028G009 ML20028G013
References
LER-83-011-03L, LER-83-11-3L, NUDOCS 8302070314
Download: ML20028G013 (2)

Text

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

' 0 RC /L/ (6) /0/5/0/0/0/3/3/9/ (7) /1/1/1/9/8/2/ (8) /0 /1/2 /8 /8 /3 / (9)

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

/0/2/ / With the Unit in Mode 1, the Individual Rod Position Indication (IRPI) deviated /

/0/3/ / from the group demand position by greater than 12 steps on four occasions between/

/0/4/ / January 8.1983 and January 22, 1983. The IRPI channels affected were for Rods /

/0/5/ / B-08. H-06 and twice for Rod H-02. All rods are in Control Bank "D". The IRPI /

/0/6/ / channels were satisfactorily calibrated within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />; therefore the health and /

/0/7/ / safety of the general public were not affected. These events are contrary to /

/0/8/ / T.S. 3.1.3.2 and reportable pursuant to T.S. 6.9.1.9.b. /

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

/0/9/ /I/F/ (11) /E/ (12) /E/ (13) /I/N/S/T/R/U/ (14) /I/ (15) /Z/ (16)

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

(17) REPORT NUMBER /8/3/ /-/ /0/1/1/ /s s/ /0/3/ /L/ /-/ /0/

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

/E/ (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 the indicator disagreement was instrument drift. This is a recurring /

/1/1/ / problem and is generic to Westinghouse Analog Position Indication Systems. The /

/1/2/ / Rod Position Indicator Channel for Rods B-08, B-02 and F-06 were properly recali-/

/1/3/ / brated an? returned to service. /

/1/4/ / /

FACILITY METHOD OF STATUS  % POWER DISCOVERY DESCRIPTION (32)

/1/5/ /F/(28) /0/7/8/ (29) / OTHERNA STATUS

/ ( } DISCOVERY

/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 l NUMBER TYPE DESCRIPTION (39) i l

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

PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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

LOSS OF OR TYPE DAMAGE TO FACILITY (

DESCRIPTION

/1/9/ /z/ (42) / NA /

l PUBLICITY ISSUED DESCRIPTION (45) NRC USE ONLY

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

NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 B302070314 83012e gDRADOCK 05000339 PDR - -_ , __ _ _ - . _ _ _ _ _ _

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Virginia Electric and Power Company North Anna Power Station, Unit No. 2

Attachment:

-Page 1 of 1 l Docket No. 50-339 Report No. LER 83-011/03L-0 Description of Event With the Unit in Mode 1, the . Individual Rod Position Indication 4

(IRPI) deviated from the group demand position by greater than 12 steps on the following dates and rods:

January 08, 1983 - Rod B-08 in Control Bank "D" January 14, 1983 - Rod H-02.in Control Bank "D" January 16, 1983 - Rod F-06 in Control Bnnk "D" January 22, 1983 - Rod H-02 in Control Bank "D" In each case, the unit power level was in the process of changing or had recently completed a change in power. These events are contrary to T.S. 3.1.3.2 and reportable pursuant to T.S. 6.9.1.9.b.

Probable Consequences of Occurrence

'- Operability of Control Rod Position Indication is required to determine rod position and thereby ensure compliance with the control rod alignment and insertion limits. Since the control rods were not misaligned and~the position indication was properly restored within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, there was no effect on the safe operation of the plant. As a result, the health and safety of the general public were not af fected.

4 Cause of Event i The cause of the disagreement in Rod Position Indication was 3

instrument drift.

Immediate Corrective Action The Rod Position Indicator Channels for B-08 H-02 and F-06 were satisfactorily recalibrated and returned to service.

Scheduled Corrective Action No further action required.

i Actions Taken to Prevent Recurrence i

No further action required.

Generic Implications The drift associated with this Position Indicating System has been a generic problem at North Anna Units 1 and 2.

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