ML20009H353

LER 81-106/03L-0:on 810702,in Mode 5,operating Light on Panel for EMF-51-B Would Not Remain Illuminated.Probably Caused by Design Problem in Amplifier/Readout Module (Ga Co Model RP-2C)

ML20009H353
Person / Time
Site:	McGuire
Issue date:	07/30/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009H350	List: ML20009H349 ML20009H353
References
LER-81-106-03L, LER-81-106-3L, NUDOCS 8108100003
Download: ML20009H353 (1)

Text

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EVENT oATE 74 2s mg,CMT oArE 80 EVENT CESCRIPTION ANo PROSAdLE CONSEcuENCES h t o 121 I While in Mode 5, it was observed that the " operating" light on the panel for ;

10i311 EMF-51-B would not remain illuminated, and thus the system was declared inoperr io14i Iable. This is a violation of T.S. 3.3.3.1whichisreportableperT.S.6.9.1.[3(b).

l o t s ! I The failure of the " operating" light to be illuminated has no effect on the  ;

tots 1Iactual operability of the instrument, soifanaccidentinvolvinghighdosesof a r i radiation occurred its magnitude could have been determined. Thus, neither l l o is t I the safe operatio_ sf the plant or health and safety of the public were affectged.

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ao en 42 . 43 CAusE cEsCmenCN ANO CORRECOVE ACTIONS h titollTr is holieved that a tiansistor within the input amplifier of the EMF-15-B 1 g l Amplifier / Readout Module (Model RP-2C) becomes saturated because a resistor is, LL.M.) Imissing from the circuit's design. This results in a drift of the instrument

,,,3, j off the zero end of the scale. EMF-51-B's calibration was checked and repairs, I

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, . io i llllllll[ll!l se ., ,o NAMa c, PRuARER Phillip B. Nardoci ,seN g; (704) 173-7432 8108100003 810730 PDR ADOCK 05000369 S PDR