05000259/LER-1979-034-03, /03L-0:on 791126,while Conducting Relay Testing on Unit 3 Recirculation Pump Boards,Relays Inadvertently Tested on Unit 1 Pump Board,Shutting Down Both Recirculation Motor Generator Sets.Caused by Personnel Error

/03L-0:on 791126,while Conducting Relay Testing on Unit 3 Recirculation Pump Boards,Relays Inadvertently Tested on Unit 1 Pump Board,Shutting Down Both Recirculation Motor Generator Sets.Caused by Personnel Error

ML20008D679
Person / Time
Site:	Browns Ferry
Issue date:	12/21/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20008D678	List: 05000259/LER-1979-034, Forwards LER 79-034/03L-0 05000259/LER-1979-034-03, /03L-0:on 791126,while Conducting Relay Testing on Unit 3 Recirculation Pump Boards,Relays Inadvertently Tested on Unit 1 Pump Board,Shutting Down Both Recirculation Motor Generator Sets.Caused by Personnel Error
References
LER-79-034-03L, LER-79-34-3L, NUDOCS 7912280513
Download: ML20008D679 (2)

LER-1979-034, /03L-0:on 791126,while Conducting Relay Testing on Unit 3 Recirculation Pump Boards,Relays Inadvertently Tested on Unit 1 Pump Board,Shutting Down Both Recirculation Motor Generator Sets.Caused by Personnel Error

Event date:
Report date:
2591979034R03 - NRC Website

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,mie 'l recircSumdoan!.s, J W l lDurine normal operation while conduceing relay testing on I recire numo board.

This resulted in shut-1 l rela s were inadvertently tested on unit o 3 Were 1

Technical specification 3.6.F.5 was involved.

I o i 4 I ltine down both recire MG sets.

n ere are no redundant svstems. No _j

.' loisJ lwas no danger to health or safety of the public.

j SI 4.6.A.6 and SI 4.6 A.7 were run.

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LER SUPPLEMENTAL INFORMATION BFRC-50 259_f 7934 Technical Specification invoked 3.6.F.5 Reported Under Technical Specification 6.7.2.b.2 D' te af Occurrence 11/26/79 Time of Occurrence 2052 l'r.it 1

a 13ef.tViertion and,_ Description cf Occi:rrence:

1A and 1B recire MG sets were tripped.

Cor di'.for Pricr to Occurrence:

U-1 0 85%.

U-2 @ 99%

b-3 0 0 refueling outage.

Actisn specified in the Technical Specification Surveilbnce Regiairen.ents met dug _ys inoperable equipment. Describe.

SI 4.6.A.6 and SI 4.6.A.7 were run.

& parent Cause of Occurrence:

The recire MG sets were tripped due to an error in relay testing.

Anahr.as af Occurrence:

1here was no damage to plant equip =ent.

there was no activity release, no personnel exposure or injury, and no danger to health or safety of-the public.

Correr.t:ve Action:

1A and 1B recire MG sets were placed back in service, The error was discussed Qith all personnel involved in order to determine the reason it happened and to eliminate any similar futtr.e events.

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