05000260/LER-1980-023-03, /03L-0:on 800607,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped Due to Generator Stator Temp High Relay Actuation.Probable Cause Was Loose Wire Caused by Vibration

/03L-0:on 800607,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped Due to Generator Stator Temp High Relay Actuation.Probable Cause Was Loose Wire Caused by Vibration

ML18025A944
Person / Time
Site:	Browns Ferry
Issue date:	06/27/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18025A943	List: 05000260/LER-1980-023, Forwards LER 80-023/03L-0 05000260/LER-1980-023-03, /03L-0:on 800607,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped Due to Generator Stator Temp High Relay Actuation.Probable Cause Was Loose Wire Caused by Vibration
References
LER-80-023-03L-02, LER-80-23-3L-2, NUDOCS 8007080399
Download: ML18025A944 (3)

LER-1980-023, /03L-0:on 800607,during Normal operation,2A Reactor Recirculation Motor Generator Set Tripped Due to Generator Stator Temp High Relay Actuation.Probable Cause Was Loose Wire Caused by Vibration

Event date:
Report date:
2601980023R03 - NRC Website

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~ ~DS stator temperature high relay actuation.

This resulted in single loop operation at reduced power.

Reference Technical Specification 3.6.F.

2B reactor recirculation MG set was operable.

There was no danger to health or safety of public.

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80 23 Technical Specification Involved Reported Undei Technical Specification Date of Occurrence Time of Occurrence 0523

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Unit Identification and Descri tion'of Occurrence:

Reactor recirculation MG set 2A drive motor tripped with resultant loss of 2A recirculation pump.

Unit operated at reduced load.

Conditions Prior to Occurrence:

Unit 1 8 85%

Unit 2 8

98%

Unit 3 8 75%

Action specified in the Technical Specification Surveillance Requirements met due to i~no erebie e ui nnent.

Describe.

EOI-1 was initiated.

~Ayarcnt Cause of Occurrence:

!Recirculation pump MG set 2A tripped when generator stator temp. relay picked up.

f There was no damage to plant equipment.

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

Corrective Action

Electrical tests were'un on the relay and RTD.

No problems were found and cause of relay actuation unknown.

A p6ssible loose wire caused by vibration was suspected.

Circuit was moved to a spare RTD.

4 Failure Data:

BFRO-50-260/80018

~Retention:

eriod - Lifetime; Responsibility

- Administrative Supervisor

• Revision: