ML20038C976

LER 81-172/03L-0:on 811031,while Preparing for Unit Startup, Loop T Avg Deviation,Loop D/T Deviation & Lo-Lo T Avg Alert Alarmed on Control Room Annunciator.Caused by Malfunctioned NRA Card.Card Replaced

ML20038C976
Person / Time
Site:	McGuire
Issue date:	11/30/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20038C973	List: ML20038C972 ML20038C976
References
LER-81-172-03L, LER-81-172-3L, NUDOCS 8112140310
Download: ML20038C976 (1)

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EvtNT C ATE le ?S 8EPCATDAtt sa tvtuT cesen:t ncn mc Pnesast.s ccusscucsets 13 I 21 I While in Mode 3 in preparation fo@r unit startup, a loop T Avg deviation, a loop, t o [3 ] 1 D/T deviation, and a Lo-log galert alarmed on the control room annunciator,l 131 1 L and were accompanied by a "PCS Power Supply Failure Protection Cabinet 1" in- I l o ! s i {_slig.ation. Subsequently, pursuant to T.S.3.3.1 which is reportable per T.S.  ;

Io HII 6.9.1.13(b) and similar to RO 369/81-125, the loop "A" overtemperature delta  !

j o !1) [ T and overpower delta T reactor protection channels were manually tripped. Be7 i o i. ; j cause of the redundancy of the reactor protection system, health and safety off 2

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I i s j ;i i putting the protection coincidence logic in a more conservative 1 out of 3 j isi3}{ condition. The malfunctioning NRA card was replaced and the loop "A" tempera 1 it r

i.; I ture instrumentation calibrated, and declared operable.

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