05000338/LER-1980-085-03, /03L-0:on 801011,during Mode 1,pressurizer Level Indication of LT-1461 Deviated from Average Reading & Was Declared Inoperable.Caused by Technicians Securing Ref Leg Tubing.Leg Properly Secured & Transmitter Operable

/03L-0:on 801011,during Mode 1,pressurizer Level Indication of LT-1461 Deviated from Average Reading & Was Declared Inoperable.Caused by Technicians Securing Ref Leg Tubing.Leg Properly Secured & Transmitter Operable

ML19339B628
Person / Time
Site:	North Anna
Issue date:	11/03/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19339B627	List: 05000338/LER-1980-085, Forwards LER 80-085/03L-0 05000338/LER-1980-085-03, /03L-0:on 801011,during Mode 1,pressurizer Level Indication of LT-1461 Deviated from Average Reading & Was Declared Inoperable.Caused by Technicians Securing Ref Leg Tubing.Leg Properly Secured & Transmitter Operable
References
LER-80-085-03L, LER-80-85-3L, NUDOCS 8011070346
Download: ML19339B628 (2)

LER-1980-085, /03L-0:on 801011,during Mode 1,pressurizer Level Indication of LT-1461 Deviated from Average Reading & Was Declared Inoperable.Caused by Technicians Securing Ref Leg Tubing.Leg Properly Secured & Transmitter Operable

Event date:
Report date:
3381980085R03 - NRC Website

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U.S. NUCLEAR REGULATORY COMMISSION l

LICENSEE EVENT REPORT CONTROL BLOCK / / / / / / / (1)

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE 1YPE CAT l

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DOCKET NUMBER EVENT DATE REPORT DATE j

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10)

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On October 11, 1980, while operating in Mode 1 at 100% power, the pressurizer /

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level indication provided bv LT-1461 deviated from the average reading and was /

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declared inoperable. Since LT-1461 was placed in the tripped mode within one

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hour as specified by T.S. 3.3.1.1, and two redundant protection channels were /

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available, the health and safety of the public were not affected. Reportable /

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pursuant to T.S. 6.9.1.9.b.

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SYSTEM

CAUSE

CAUSE COMP.

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

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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

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (27)

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The level indication was oscillating whi:- instrument technicians were

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securing the reference leg tubing associated with the newly installed

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transmitter. The reference leg was clamped to structural supports to prevent

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movement of the pipe. The level transmitter is reading properly, and it has

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been returned to an operable status.

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FACILITY METHOD OF l

STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32) i

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ACTIVITY CONTENT RELEASED OF 'IELEASE AMOUNT OF ACTIVITY (35)

LOCATION OF RELEASE (36)

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39) l

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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l NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 80110703fd

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

Attachment:

Page 1 of 1 1

Docket No. 50-338 Report No. LER 80-085/03L-0

Description of Event

on October 11, 1980, while operating in Mode I at 100% power, the pressurizer level indication provided by LT-1461 deviated from the average. reading and was declared inoperable.

Probable Consequences of Occurrence Since LT-1461 was placed in the tripped mode within one hour as specified by T.S. 3.3.1.1 and two redundant protection channels were available, the health and safety of the public were not affected.

Cause of Event

The level. indication was oscillating over a range of 20% while technicians were securing the reference leg tubing associated with the transmitter to prevent its movement.

Immediate Corrective Action

The immediate action was to declare the channel inoperable, and place it in the trip mode.

Scheduled Corrective Action None Actions Taken to Prevent Reccurrence The reference leg piping was clamped to structural supports to prevent further movement of the pipe. The level transmitter has since been reading properly, and it has been returned to an operable status.

Generic Implications There are no generic implications based on maintanence history to date.

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