05000260/LER-1980-018-03, /03L-0:on 800321,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped.Caused by Generator Stator Temp High Relay Actuation

/03L-0:on 800321,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped.Caused by Generator Stator Temp High Relay Actuation

ML18025A813
Person / Time
Site:	Browns Ferry
Issue date:	04/18/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A812	List: 05000260/LER-1980-018, Forwards LER 80-018/03L-0 05000260/LER-1980-018-03, /03L-0:on 800321,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped.Caused by Generator Stator Temp High Relay Actuation
References
LER-80-018-03L-01, LER-80-18-3L-1, NUDOCS 8004220680
Download: ML18025A813 (4)

LER-1980-018, /03L-0:on 800321,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped.Caused by Generator Stator Temp High Relay Actuation

Event date:
Report date:
2601980018R03 - NRC Website

text

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~o3 stator temperature liigh relay actuation.

Unit reduced load.

Reference Technical Specification 3.6.F.

There was no danger to health or safety of the public.

Previo~us occurrence:

BFRO-50-260 ot8007.

No redundant system.

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The RTD and relay were checked for ro er o eration.

No which could have tripped 2A Recirc.

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No recurrence control re 3

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Tennessee Valley Authorit

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/~0la Technical Specification Involved Reported Under Technical Specification 6.7.2.b 2

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Identification and Descri tion'f Occur rence:

2A, recirculation pump MG set tripped on generator*stator temperature high.

Load was

reduced, Conditions Prior to Occurrence:

- VWtle0%

Unit 2 8 98%

Unit 3 8 98%

Action specified in the Technical SpecU'ication Surveillance Requirements met due to ino erable e ui ment.

Describe.

EOI, 1 was, ini,tiated A

arent Cause of Occurrence:

Recirculation pump MG set 2A tripped when generator stator temp. high relay actuated.

Anal sis of Occurrence:

There was no damage to plant equipment.

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

Corrective Action

Electrical tests were run on the relay and RTD.

The generator stator winding temp.

annunciation was changed to a spare RTD and the previously used RTD was monitored after the MG set was returned to service.

No problems were found and the charts show no high temp.

readings at time of trip.

A spurious signal is suspected to have caused the relay ac&ation.

1 ailure Data:

BFRO-50-260/ 8007

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

~Revision: