05000296/LER-1981-031-03, /03L-0:on 810624,during Normal Operations 3-A Reactor Recirculation Pump Tripped Due to 2A-K45A Relay Action.Caused by Resistance Temp Detector High Temp Trip. Unit Load Reduced.Ge Motor Generator Set & Restarted

/03L-0:on 810624,during Normal Operations 3-A Reactor Recirculation Pump Tripped Due to 2A-K45A Relay Action.Caused by Resistance Temp Detector High Temp Trip. Unit Load Reduced.Ge Motor Generator Set & Restarted

ML20009E542
Person / Time
Site:	Browns Ferry
Issue date:	07/21/1981
From:	Holder G TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E534	List: 05000296/LER-1981-031, Forwards LER 81-031/03L-0 05000296/LER-1981-031-03, /03L-0:on 810624,during Normal Operations 3-A Reactor Recirculation Pump Tripped Due to 2A-K45A Relay Action.Caused by Resistance Temp Detector High Temp Trip. Unit Load Reduced.Ge Motor Generator Set & Restarted
References
LER-81-031-03L, LER-81-31-3L, NUDOCS 8107280290
Download: ML20009E542 (2)

LER-1981-031, /03L-0:on 810624,during Normal Operations 3-A Reactor Recirculation Pump Tripped Due to 2A-K45A Relay Action.Caused by Resistance Temp Detector High Temp Trip. Unit Load Reduced.Ge Motor Generator Set & Restarted

Event date:
Report date:
2961981031R03 - NRC Website

text

o U. S. NUCLE AR REGULATORY COMMISSION NRC DORM 366 LICENSEE EVENT REPORT CONYROL BLOCK: l l

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a EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h the 3-A reactor recirculation pump tripped l

Jojzjl During normal operation at steady state, due to 2A-K45A relay action.

(See T.S. 3.6.F.1)

There was no danger to the health l

[o ;3 j l lol4ll or safety of the public. There were no redundant systems.

3-B pump was operable.

l BFRO-50-260/81009, 80018, 81023; 296/81028.

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31 40 el 42 43 44 47 JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Unit load was reduced l

Iiio1l 2A-K45A relay action initiated by RTD high temperature trip.

The high temperature l and the G.E. variable speed M/G set and pump were restarted.

Ii ii l Alam annunciates at 110 degrees l trip setpoint was raised to 120 degrees centigrade.

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A special test will be implemented to investigate this problem.

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" Tennessee Valley Auttiority 13 F 15. 2 Br..wns Ferry Nuclear Plant h/o1/81 I.F.!! Sl!PPl.10lliNTAI. INi/ollM ATIO 4 Tr. huiad S n cific ation in ceived 3.6.E.L...._ _ __.._

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• Date due N11C:.,7/2.4/81,_ _,

luetc.4 Occurrerm-6/24/81 l'itne of Occurrence _2008,, Unit,,,3,,,__,,_,,.,

Nicnjirie,at hqi an.!,In,periptyn.4 i b:currener 3-A reactor recirculation pump tripped due to 2A-K45A relay action.

4 t %nilitions l'rior to Uccurrence.

j Unit 1 in refueling outage Unit 2 at 1 LOO %

Unit 3 at 98%

m.

Action specifimi in the Technical Specification Surveillance Requirements met W"Lt?. 'D?pggh,le equinment. _ 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 />.

1 l

l Appart of.Caus.c of ( b cut;tence The reactor recirculation motor generator set tripped due to 2A-K45A relay action initiated by RTD high temperature trip.

2 Analysis <# Oeno reni.

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There was no danger - to tha health or safety of the public, no release of activity, no damage to tl.e plant or equipment, and no resulting significant chain of events.

1 C rrective Action: A special test is being written and will be implemented

.to investigate this problem. Recurrence control will depend on results from these investigations. By 6/27/81, the trip setting for the drive motor high 1

j temperature and gen hi temp relays for each M/G set on all three units were.

raised to trip at 120 C.

Alarm annunciates at 110 C.

Failure.hata: BFRO-50-260/81009, 80018, 81023; 296/81028.

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