05000348/LER-1979-002-03, /03L-0 on 790116:120V Vital AC Bus 1B Was Deenergized When Inverter 1B Tripped Due to Components Failure.Capacitor,Air Core Choke,Resistor & Fuse Were Replaced & Inverter Returned to Svc

/03L-0 on 790116:120V Vital AC Bus 1B Was Deenergized When Inverter 1B Tripped Due to Components Failure.Capacitor,Air Core Choke,Resistor & Fuse Were Replaced & Inverter Returned to Svc

ML19274D657
Person / Time
Site:	Farley
Issue date:	02/13/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19274D655	List: 05000348/LER-1979-002-03, /03L-0 on 790116:120V Vital AC Bus 1B Was Deenergized When Inverter 1B Tripped Due to Components Failure.Capacitor,Air Core Choke,Resistor & Fuse Were Replaced & Inverter Returned to Svc 05000348/LER-1979-003-03, /03L-0 on 790116:following Reactor Trip,Turbine Driven Auxiliary Feedwater Pump Failed to Start.Caused by Trip/Throttle Valve Which Tripped Shut ML19274D654
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902210230
Download: ML19274D657 (1)

LER-1979-002, /03L-0 on 790116:120V Vital AC Bus 1B Was Deenergized When Inverter 1B Tripped Due to Components Failure.Capacitor,Air Core Choke,Resistor & Fuse Were Replaced & Inverter Returned to Svc

Event date:
Report date:
3481979002R03 - NRC Website

text

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60 61 DOCKE T NUMB EH 03 ta EVENT DATE 14 75 HEPORT D ATE 18 0 EVEGT DESCRIPTION AND PROBABLE CONSEQUENCES h l At 0137 on li16/79 120V vital AC bas IB was deenergized when inverter IB tripped I

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l (reactor trip resulted). Tech. Spec. 3,8.2.1 specifies that 120V vital AC bus,lB j

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l o l 4 l l shall be operable, energized and aligned to an operable diesel generator. At 01.'.2 l

l bus 1B was reenergized from the alternate supply to restore power to affected l

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instrumentation. The Tech Spec 3.8.2.1 action statement was met.

The health and 1

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lsafety of the public were not affected.

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33 34 33 Ju 31 40 41 gy 43 44 gy CAUSE DESCRIPTION AND CORHECTIVE ACTIONS h i OIl Inverter trip was caused by failure of inverter components.

A capacitor. air core 1

[i [i l l choke, resistor and a fuse were replaced aiH' the inverter was rettirned to servico,e I

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