05000368/LER-1979-082-03, /03L-0:on 790922,care Protection Calculator C Failed.Caused by Failure of Reactor Coolant Pressure Speed Input.Input Pulse Shaper Contacts Cleaned & Channel C Returned to Svc

/03L-0:on 790922,care Protection Calculator C Failed.Caused by Failure of Reactor Coolant Pressure Speed Input.Input Pulse Shaper Contacts Cleaned & Channel C Returned to Svc

ML19254D813
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/24/1979
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19254D808	List: 05000368/LER-1979-082, Forwards LER 79-082/03L-0 05000368/LER-1979-082-03, /03L-0:on 790922,care Protection Calculator C Failed.Caused by Failure of Reactor Coolant Pressure Speed Input.Input Pulse Shaper Contacts Cleaned & Channel C Returned to Svc
References
LER-79-082-03L, LER-79-82-3L, NUDOCS 7910300199
Download: ML19254D813 (1)

LER-1979-082, /03L-0:on 790922,care Protection Calculator C Failed.Caused by Failure of Reactor Coolant Pressure Speed Input.Input Pulse Shaper Contacts Cleaned & Channel C Returned to Svc

Event date:
Report date:
3681979082R03 - NRC Website

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1. 4 75 REPOHT O ATE 84 0 EVENT DESCRIPTION AND PROS ABLE CONSEQUENCES h DurW Mode 2 operation, "C" Core Protection Calculator failed. All i

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i remailing channels were operable.

The channel "C" DNBR and LPD trips FETTI 1 were bypassed olacing reactor trip loaic in 2 out of 3.

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l l ii 3J 34 35 JO II 40 41 42 43 44 es CAUSE DESCRIPTION AND CORREC flVE ACTIONS h liioi l Investiaation revealed a failed RCP "D" speed input.

The speed input I pulse shaper contacts were cleaned, CPC channel "C" was functionally i i tested and returned to service in uo hours, meeting Action Statement i,12; i

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