05000368/LER-1981-003-03, /03L-0:on 810113,plant Computer Failed & Would Not Restart,Rendering Core Operating Limits Supervisory Sys Inoperable.Caused by Capacitor in Floating Point Power Supply & Generstor Noise Due to Short.Capacitor Replaced

/03L-0:on 810113,plant Computer Failed & Would Not Restart,Rendering Core Operating Limits Supervisory Sys Inoperable.Caused by Capacitor in Floating Point Power Supply & Generstor Noise Due to Short.Capacitor Replaced

ML20003B323
Person / Time
Site:	Arkansas Nuclear
Issue date:	02/03/1981
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20003B317	List: 05000368/LER-1981-003, Forwards LER 81-003/03L-0 05000368/LER-1981-003-03, /03L-0:on 810113,plant Computer Failed & Would Not Restart,Rendering Core Operating Limits Supervisory Sys Inoperable.Caused by Capacitor in Floating Point Power Supply & Generstor Noise Due to Short.Capacitor Replaced
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8102100660
Download: ML20003B323 (1)

LER-1981-003, /03L-0:on 810113,plant Computer Failed & Would Not Restart,Rendering Core Operating Limits Supervisory Sys Inoperable.Caused by Capacitor in Floating Point Power Supply & Generstor Noise Due to Short.Capacitor Replaced

Event date:
Report date:
3681981003R03 - NRC Website

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8 60 69 pocaL E T Nuw8 t m E.8 69 EVENT DATE is FS NfPOHTOa7E 80 EVENT DESCRIPTION AND PROB A8LE CONSEQUENCES h Io l a l i Durine Mode 1 operation. the plant computer failed and would not restart,I t renderinn the Core Operatinn Limits Supervisory System (COLSS) inoperab1q.

Io12i lo1411 Action was taken to reduce power to bring the Core Protection CalculatorI lcIsl l (CPC) indicated LPD 5 DSBR values within the limits of T.S. 3.2.4 and l

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x ao CAUSE DESCR pTION AND CCRRECflVE ACTIONS h I v i c, I 1 The cornuter had a narity error caused bv a canacitor in the floatine I i i i j Lpoint nower supply, generatinn noise due to a short. The capacitor was i 1 replaced, power supply adjusted for proper operation, and computer diag i 2 i 3 l nostics successfully run with no errors detected.

COLSS was returned toi t operable status and normal power operation was continued.

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