ML19256A881

LER 78-047/03L-0 on 781213:refueling Water Tank Narrow Range Level Indicator (Lia 4142) Was Out of Calibr & Tank Level Was Too Low.Caused by Malfunctioning Power Supply Model TA4552

ML19256A881
Person / Time
Site:	Calvert Cliffs
Issue date:	01/11/1979
From:	Davis S, Romney K BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19256A876	List: ML19256A875 ML19256A881
References
LER-78-047-03L, LER-78-47-3L, NUDOCS 7901160267
Download: ML19256A881 (2)

Text

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7 B 00 61 DOCKET NUVBEp te 69 74 7b DATE EVENT DESCRIPTION AND PROGABLE CONSEQUENCES h 1012l LAt 1135 refuelina water tank (RUT) narrow rance level indicator (LIA 4142) l lO i3 ; lwas found to be out of calibration and actual RWT level was 37.2 feet whereas l 0 4 l 38.1 feet is needed for 400,000 gallons as required by T.S.3.S.4.a. The RWT l g lwas filled to greater than 38.1 feet at 1208. This is not a repetitive l l0isl l occurrence. ,

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40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

" g lThe A.G.M. Electronics, Inc. power supply, model TA4552, for 2-LI-4142 mal- l f[T1T] functioned and caused the erroneous readings. The power supply was replaced l

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l , , land the instrument calibrated. A redundant level indicator, 2-LI-4143 was L

, 3 lin service during the event but did not alarm. Investigation determined that l

, , I the setpoint of the redundant alarm was 2.5 feet below its proper level. Con't. l STANS  % POWER OTHER STATUS DIS O RY SCOV IPTION 32 i s W @ l 0l 9l 7l g l NA l J gl Recalibration ofinSl"rumen l A TiVITY CO TENT RE r As tOCAmN OP REtEASE @

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S. M. Davis /K. M. Romney . 01 234-7942/7960

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ATTACHMENT T0:

LER 78-47/3L DOCKET NO. 50-318 EVENT DATE 12/13/78 REPORT DATE 1/11/79 CONTINUED CAUSE DESCRIPTION AND CORRECTIVE ACTIONS: (CONTINUED)

The redundant level indicator has been adjusted to its proper setting.

Appropriate plant personnel have been counseled regarding the proper procedure to make setpoint changes. The control room operators' log will be revised to include the logging of the wide range RWT indication, as well as the narrow range indication.

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