ML20010A613

LER 81-107/03L-0:on 810704,auxiliary Feedwater Flow Gauges for Steam Generator C & D Declared Inoperable.On 810706, Plant Entered Mode 3 from Mode 4.Caused by External Source Tied Into Instrument Loops Causing Power Supply to Fail

ML20010A613
Person / Time
Site:	McGuire
Issue date:	08/03/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010A605	List: ML20010A604 ML20010A613
References
LER-81-107-03L, LER-81-107-3L, NUDOCS 8108110607
Download: ML20010A613 (1)

Text

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o 2 ion July 4, 1981, routine surveillance discovered that the auxiliary feedwater l

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"C" and "D" were defective. and thus wete a 4 ideclared inoperable. On July 6, the plant entered Mode 3 from Mode 4 causing I o s 1this to violate T.S. 3.3.3.6 which is reportable per T.S. 6.9.1.13(b) and similar o a Ito previous R.O. #81-92. The inoperability of these instruments would not affegt o 7 l rho auxiliary feedwater system in providinR its necessary function. Thereforet g

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s [_T_he instrumentation became inoperable because an external source..(600. volts) l g l tied into the instrument loops causing the "C" and "D" loops' power supply, traps-L'_LIJ l mit ters (Barton. Model 386A) and indicators to fail. A design modification wasi lis21linfrinrod en remove the wire connection. the transmitters and indicators were 1

[ii.gI replaced and calibrated per procedures, and the loops' power supply was replacpd.

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