05000339/LER-1981-044-03, /03L-0:on 810528,rod D 06 Position Indication Was Inoperable.Caused by Defective Signal Conditioning Module. New Module Installed & Rod Position Indication Sys Recalibr

/03L-0:on 810528,rod D 06 Position Indication Was Inoperable.Caused by Defective Signal Conditioning Module. New Module Installed & Rod Position Indication Sys Recalibr

ML19350E231
Person / Time
Site:	North Anna
Issue date:	06/10/1981
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350E230	List: 05000339/LER-1981-044, Forwards LER 81-044/03L-0 05000339/LER-1981-044-03, /03L-0:on 810528,rod D 06 Position Indication Was Inoperable.Caused by Defective Signal Conditioning Module. New Module Installed & Rod Position Indication Sys Recalibr
References
LER-81-044-03L-01, LER-81-44-3L-1, NUDOCS 8106170185
Download: ML19350E231 (2)

LER-1981-044, /03L-0:on 810528,rod D 06 Position Indication Was Inoperable.Caused by Defective Signal Conditioning Module. New Module Installed & Rod Position Indication Sys Recalibr

Event date:
Report date:
3391981044R03 - NRC Website

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U.S. NUCLEAR REOULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRE 9 INFORMATION)

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/V/A/N/A/S//2 (2)

/0/0/-/0/0/0/0/0/-/0/0/ (3)

/4/1/1/1/1 (4)

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LICENSEE CODE LICENSE NUMEER LICENSE TYPE CAT 0/1/

/L/ (6)

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/0/5/2/8/8/1/ (8) /0 /6 /1/0 $ /1/ (9)

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

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/ On May 28, 1981, with Unit II at 100% power, it became necessary to replace the /

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/ signal conditioning module for rod D 06.

This in turn caused the rod D 06 posi _/

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/ tion indication to be inoperable. Since action was taken to repair and calibrate /

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/ the affected rod indication within the time specified by Technical Specifications,/

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/ the public health and safety were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/I/F/ (11) /E/ (12) /I/ (13) /I/N/S/T/R/U/ (14) g/ (15)

[Z/ (16)

- SEQUENTIAL OCCURRENCE REPORT REVISION LER/R0 EVENT YEAR REPORT NO.

CODE TYPE NO.

(17)-REPORT NUMBER

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ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRD-4 PRIME COMP. COMPONENT TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER [A[ (18) /Z/ (19) /Z/ (20) /Z/ (21) /0/0/0/0/ (22) g/ (23) /N/ (24) /N/ (25) /W/1/2/0/ (26)

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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/,The cause of this event was a defective signal module for rod D 06.

A new signal /

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/ module was installed and the rod position indication system recalibrated sat-

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/ isfactorily.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

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/E/ (28)

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NA

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

ACTIVITY CONTENT RELEASED GF RELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

/1/6/

[ZL (33)

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NA

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NA

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j PERSONNEL EXPOSURES i

NUM3ER TYPE DESCRIPTION (39)

/1/7/ /0/0/0/ (37) [ZL (38) /

NA

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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

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LOSS OF OR DAMAGE TO FACILITY ':3)

TYPE

DESCRIPTION

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NA

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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/N/ (44) /

NA

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8106 170 D i

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

Attachment:

Page 1 of I Docket No. 50-339 Report No. LER 81-044/03L-0

Description of Event

On May 28, 1981, with Unit II at 100% power in mode I, the rod position indication for red D 06 indicated > 235 steps while its associated computer point indicated 227 steps for a demand of 228 steps. While attempting to correct the problem, it became necessary to change the signal conditioning module for rod D 06.

This event is contrary to T.S.

3.1.3.1 and reportable pursuant to T.S. 6.9.1.9.h.

Probable Consequences of Occurrence Since action was taken and completed to restore the affected rod to operability within the time restraints of Technical Specifications, the

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public health and safety were not affected.

--Cause of Event The cause of this event was a defective signal conditioning module for rod D 06 only.

Immediate Corrective Action

The immediate corrective action taken was to replace the signal conditioning module (required new process control card) for rod D 06 only.

Scheduled Corrective Action No further corrective action is scheduled at this time.

Actions Taken to Prevent Recurrence No action to prevent recurrence is required.

Generic Implications There are no generic itplications to this event.