05000318/LER-1980-002-03, /03L-0:on 800107,refueling Water Tank Narrow Range Level Indicator Was in Alarm W/Low Level,But Instrument Did Not Indicate Alarm Conditions.Caused by Faulty Indicator Alarm light-emitting Diode.Diode Replaced

/03L-0:on 800107,refueling Water Tank Narrow Range Level Indicator Was in Alarm W/Low Level,But Instrument Did Not Indicate Alarm Conditions.Caused by Faulty Indicator Alarm light-emitting Diode.Diode Replaced

ML19260D975
Person / Time
Site:	Calvert Cliffs
Issue date:	02/07/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19260D972	List: 05000318/LER-1980-002, Forwards LER 80-002/03L-0 05000318/LER-1980-002-03, /03L-0:on 800107,refueling Water Tank Narrow Range Level Indicator Was in Alarm W/Low Level,But Instrument Did Not Indicate Alarm Conditions.Caused by Faulty Indicator Alarm light-emitting Diode.Diode Replaced
References
LER-80-002-03L, NUDOCS 8002120689
Download: ML19260D975 (2)

LER-1980-002, /03L-0:on 800107,refueling Water Tank Narrow Range Level Indicator Was in Alarm W/Low Level,But Instrument Did Not Indicate Alarm Conditions.Caused by Faulty Indicator Alarm light-emitting Diode.Diode Replaced

Event date:
Report date:
3181980002R03 - NRC Website

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8 9 LICENSEE CODE 14 15 CON'T

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60 61 DOCKET NUM8ER 68 69 E% ENT CATE 74 75 REPORT CATE 80 EVENT DESCRIPTION AND PROB ABLE CONSECUENCES h lAt 1100 the operator noticed the refueling vater tank (RWT) narrev rance 1

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level indicator was 'in alarm with a low level, but the instrunent did I

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g lnot indicate an alam condition.

't'he instru=ent was removed for re-1 l calibration when it was reinstalled at 1500 it was indicating 1/2 I

O s O 6 l inch below the midN1m level allowed by T.S. 3.5.h. The RWT vas filled I

9 lto greater than k00,000 gal. by 1515. The vide rance level indicator re-0 7

!=ained operable is indicated greater than h00,000 gal during the event.

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LER EVENT YEAR REPORT NO.

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• 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h lThe indicator alam circuit licht emitting diode (LED) vas faulty.

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O m IThis caused a lov level alarm to exist with noma) rance indication.

I g lThe LED vas replaced. The indicator was checked for calibration and l

g l dial response. No evidence of malfunction was found. Because-the l

L' 1.4 I I apparent cause of this event was a failure of the indicator dial to I

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% POWER OTHER STATUS 01 O RY OlSCOV ERY DE?c'llPTION

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NAME OF PREPARER PHON E:

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LER 30.

80-2/3L DOCla:T NO.

50-318 EVENT DATE 1/7/80 REPORT DATE 2/7/80 ATTAC9 MENT EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (CONTINUED)

This is not a repetitive occurrence.

CAUSE DES.:RIPTION AhD CORRECTIVE ACIIONS (CONTINUED) track properly, the instru=ent has been observed for recurrence of the problem since

• 2e event date. No problem has been noted. Therefore, no preventive action is deemed necessary.

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