ML19260D684

LER 80-002/03L-0:on 800110,during Mode 1 Operation,Core Protection Calculator C Failed,Resulting in DNBR & Linear Power Density Trips in Channel C Primary Power Sys.Cause Undetermined.Sys Restarted During Failure Analysis

ML19260D684
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/05/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19260D677	List: ML19260D676 ML19260D680 ML19260D684 ML19260D685
References
LER-80-002-03L, LER-80-2-3L, NUDOCS 8002110581
Download: ML19260D684 (1)

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80 P S to 6b DOC eL E T N uwe g g EvtNT DATE FS EVENT DESCRIPTION AND PROS A8LE CCNSEQUENCES h F5Tr1 IDuring Mode 1 coeration, core Protection Calculator "C" failed. resultino I fETTl fin DNBR & LPD trios in Channel "C" PPS The romainino CPC Channels worp l IO i. i iverified operable and Channel "C" was declared inoperable, placina reactori n s Itrio looic in 2 nut of 3 trio secuence This ncruerenco is similar tn iFPI's o s 150-368/79-098 and 79-045. I o i IRecortable ner T.S.6.9.1.9.b. I I o le 1 I i eo so C E (C E SutC E Loup 0NENT COlJE Av i e s at 8p a l I lA 16 lE_J@ LfJ G I I I N IS I T l R l u l@ [_YJ@?uO @

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40 4J 43 as as CAUSE DESCRIPTION AND CORRECrivE ACTIONS h i o Durino failure analvsis. tha system restarted on ite own when the Initializa-i,i,ii tion button was pressed. All variable constants were checked and verifiedi Li_LJ l acceotable. No cause of failure could bo determined Channel "C" CPr wat t ,l >i Lreturned to service in less than one hour meetina the reauirements of Lu.J t T.S. Table 3.3-1. Action Statement 2.a. 1

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