05000368/LER-1980-082-03, /03L-0:on 801030,during Mode 1 Operation Plant Computer Failed.Caused by Grounding Problems Due to Voltage Spikes.Welding Grounds Relocated & Computer Returned to Svc

/03L-0:on 801030,during Mode 1 Operation Plant Computer Failed.Caused by Grounding Problems Due to Voltage Spikes.Welding Grounds Relocated & Computer Returned to Svc

ML19345B981
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/25/1980
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19345B980	List: 05000368/LER-1980-082-03, /03L-0:on 801030,during Mode 1 Operation Plant Computer Failed.Caused by Grounding Problems Due to Voltage Spikes.Welding Grounds Relocated & Computer Returned to Svc ML19345B979
References
LER-80-082-03L, LER-80-82-3L, NUDOCS 8012030641
Download: ML19345B981 (1)

LER-1980-082, /03L-0:on 801030,during Mode 1 Operation Plant Computer Failed.Caused by Grounding Problems Due to Voltage Spikes.Welding Grounds Relocated & Computer Returned to Svc

Event date:
Report date:
3681980082R03 - NRC Website

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LICENSEE EVENT REPORT EXHIBIT A CONTROL 8 LOCK: l 'l l l l l lh (PLE ASE PRINT OR TYPE ALL RFQUIRED INFORMATIONI a

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Re,oHT DATs A0 EVENT DESCRIPTION AND PROS ABLE CONSEQUENCES O'o GG) I Durina Hode 1 operation the plant computer failed on' two separate occasioqs Io ni I (10-29-80 & 10-30-80). Action was initiated to reduce power to bring i

ITTTl I the Core Protection Calculator indicated DNBR & LPD values within limits i Gm]l per Tech. Spec. Figure 3.2-1 & 3.2-3.

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Reportable per Tech. Spec. 6.9.1.9b.

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JJ 34 25 36 37 44 el og 43 44 og CAUSE DESCRIPTION ANO CORRECrlVE ACTIONS h EED 1In both cases the plant computer failure was due to grounding problems.

iThe around for welding activities was creating voltage spikes and i i i i i renderina the computer inoperable.

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