05000296/LER-1981-028-03, /03L-0:on 810613,reactor Recirculation Pump 3-A Tripped Due to Motor Generator Set Tripping.Caused by 2A-K45A Relay Action Initiated by Resistance Temp Detector High Temp Trip.Unit Load Reduced

/03L-0:on 810613,reactor Recirculation Pump 3-A Tripped Due to Motor Generator Set Tripping.Caused by 2A-K45A Relay Action Initiated by Resistance Temp Detector High Temp Trip.Unit Load Reduced

ML20009F972
Person / Time
Site:	Browns Ferry
Issue date:	07/10/1981
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F960	List: 05000296/LER-1981-028, Forwards LER 81-028/03L-0 05000296/LER-1981-028-03, /03L-0:on 810613,reactor Recirculation Pump 3-A Tripped Due to Motor Generator Set Tripping.Caused by 2A-K45A Relay Action Initiated by Resistance Temp Detector High Temp Trip.Unit Load Reduced
References
LER-81-028-03L-01, LER-81-28-3L-1, NUDOCS 8108030208
Download: ML20009F972 (2)

LER-1981-028, /03L-0:on 810613,reactor Recirculation Pump 3-A Tripped Due to Motor Generator Set Tripping.Caused by 2A-K45A Relay Action Initiated by Resistance Temp Detector High Temp Trip.Unit Load Reduced

Event date:
Report date:
2961981028R03 - NRC Website

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Form BF 17 Tenne.%ee Valley AutLarity BF 15.6 Browns Ferry Nuclear Plant G/04/81 LElt SUPPLEMENTAL, IN R)hM ATIOis' hi lu n N)- 296

/ 81028 Technit al Specif h.it mn in.,Aved 3,6f.1,

llenorted Under Technical Sp"cincation 6.7.2.b.2

• nn t.e due NRC: _7L13/81 ilate of O(.currence 6/13/81 1ime of Occurrence 0405 Unit 3

Idc n t ification and l'c:.t:riptjyn of ( 3:curretjee 3-A reactor recirculation pump tripped due to M/G set tripping Conditions Prior to Occurrence:

Unit 1 - refueling outage Unit 2 - modification outage.

Unit 3 - at 98%.

A ct ion specified in the Technical Specification Surveillance Requirements met due to inoperable ettuinment.

Describe.

Restored 3-A recirculation pump to service within 1 hours1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

Apparent Cause of Occurrence:

The reactor recirculation M/G set tripped due to 2A-K45A relay action initiated by RTD high temperature trip.

Au:dvsis of Occurrence There was no danger to the health or safety of the public, no release of activity, no damage to the plant or equipment, and no resulting significant chain of events.

Corrective Action

A seecial test is being written and will be imolemented to investigate this ptoblem. Recurrence control will depend on results from these investigations. By 6/27/81, the trip setting for the drive motor high temp and Ren hi temp relays for each M/n set on all three units was raised to trip at 120 centigrade. Alarm annunciates at 110 centigrade, Failure Data:

BFRG-50-260/81007, 31000, 81018, 80023, 296/80035 lle ten tion :

Period - Lifeth ie; llesponsi'oility - Document Control Supervisor titevision :