05000338/LER-1980-083-03, /03L-0:on 800927,pressurizer Level Transmitter LI-1461 Was Observed Indicating 3.5% from Average Reading & Declared Inoperable.Caused by Failure in Temp Compensator on Differential Pressure Unit.Transmitter Replaced

/03L-0:on 800927,pressurizer Level Transmitter LI-1461 Was Observed Indicating 3.5% from Average Reading & Declared Inoperable.Caused by Failure in Temp Compensator on Differential Pressure Unit.Transmitter Replaced

ML19339A283
Person / Time
Site:	North Anna
Issue date:	10/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19339A280	List: 05000338/LER-1980-083, Forwards LER 80-083/03L-0 05000338/LER-1980-083-03, /03L-0:on 800927,pressurizer Level Transmitter LI-1461 Was Observed Indicating 3.5% from Average Reading & Declared Inoperable.Caused by Failure in Temp Compensator on Differential Pressure Unit.Transmitter Replaced
References
LER-80-083-03L, LER-80-83-3L, NUDOCS 8011030524
Download: ML19339A283 (2)

LER-1980-083, /03L-0:on 800927,pressurizer Level Transmitter LI-1461 Was Observed Indicating 3.5% from Average Reading & Declared Inoperable.Caused by Failure in Temp Compensator on Differential Pressure Unit.Transmitter Replaced

Event date:
Report date:
3381980083R03 - NRC Website

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

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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LICENSEE CODE LICENSE NUMBER LICENSE TYPE CAT

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E DOCKET NUMBER EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCdS (10)

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On September 27,19 30, at 0230 in the morning, it was observed that the press- /

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urizer level transmitter LI-1461 was reading > 3.5% from the average reading, /

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rendering the instrument inoperable. Upon review of log books, it vis dis-

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covered this situation had been in existence since 1400 on 09/26/80. Since

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there were two redundant protection channels available, and LI-1461 was placed /

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in the tripped mode within one hour of discovery, the health and safety of the /

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public were not affected.

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SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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/I/A/ (11) /E/ (12) /B/ (13) /I/N/S/T/R/U/ (14) g/ (15) g/ (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 PLIME 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 pressurizer level transmitter failed high because of a failure in the temp-/

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erature compensator on the differential pressure unit. The corrective action /

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was to replace the transmitter, bellows, and capillary. The operations staff /

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has been instructed to peruse the log books more carefully.

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FACILITY METHOD OF STATUS

% POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION (32)

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NA

/ (30) /A,[ (31) /0PERATOR OBSERVATION /

ACTIVITY CONTENT AMOUNT 'F ACTIVITY (35)

LOCATION OF RELEASE (36) 0 RELEASED OF RELEASE

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NA

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PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION (39)

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PERSONNEL INJURIES NUMBER DESCRIPTION (41)

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LOSS OF OR DAMAGE TO FACILITY 3)

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DESCRIPTION

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PUBLICITY ISSUED DESCRIPTION (45)

NRC USE ONLY

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NAME OF PREPARER W. R. CARTWRIGHT PHONE (703) 894-5151 8011os0521'

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Virginia Electric and Power Company North Anna Power Station, Unit 1 Attachment: Page 1 of 1 Docket No. 50-338 Report No. LER 80-083/03L-0

Description of Event

On September 27,1980, at 0230 in the morning, it was observed that the pressurizer level transmitter LI-1461 was reading > 3.5% from the average of the transmitter readings, rendering the instrument inoperable.

Upon review of the log books it was discovered that this situation had been in existence since 1400 on 9/26/80. The applicable T.S. is 3.3.1.1 and the event is reportable pursuant to T.S. 6.9.1.9.b and T.S. 6.9.1.9.c.

Probable Consequences of Occurrence Since there were two redundant protection channels available, and 1

LI-1461 was placed in the tripped mode within one hour of discovery, the health and safety of the public were not affected.

t

Cause of Event

The pressurizer level transmitter failed high because of a failure in the temperature compensator on the differential pressure unit.

Evidently, voids developed in the fluid in the temperature compensating device, causing it to respond erratically.

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Immediate Corrective Action

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i The immediate action was to place the channel in the tripped mode, and instruct operations personnel to peruse the log records more carefully.

i Scheduled Corrective Action A decision was made to replace the transmitter, bellows, and capillary.

i Actions Taken to Prevent Reccurrence The above action has been completed, and the level transmitter restored to operable status.

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