05000296/LER-1980-050-03, /03L-0:on 801115,breaker for Standby Liquid Control Pump B Motor Tripped When Pump Started.Caused by Overcurrent Tripping Device on B Phase Tripping at Lower Value than Other Phases.Breaker Replaced

/03L-0:on 801115,breaker for Standby Liquid Control Pump B Motor Tripped When Pump Started.Caused by Overcurrent Tripping Device on B Phase Tripping at Lower Value than Other Phases.Breaker Replaced

ML19345D842
Person / Time
Site:	Browns Ferry
Issue date:	12/11/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19345D833	List: 05000296/LER-1980-050, Forwards LER 80-050/03L-0 05000296/LER-1980-050-03, /03L-0:on 801115,breaker for Standby Liquid Control Pump B Motor Tripped When Pump Started.Caused by Overcurrent Tripping Device on B Phase Tripping at Lower Value than Other Phases.Breaker Replaced
References
LER-80-050-03L-02, LER-80-50-3L-2, NUDOCS 8012170596
Download: ML19345D842 (2)

LER-1980-050, /03L-0:on 801115,breaker for Standby Liquid Control Pump B Motor Tripped When Pump Started.Caused by Overcurrent Tripping Device on B Phase Tripping at Lower Value than Other Phases.Breaker Replaced

Event date:
Report date:
2961980050R03 - NRC Website

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LICENSEE EVENT REPORT 1

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. VENT Of 5CntPTION AND PROB ABLE CONSEQUENCES h io;7; j During normal operation while performing SI 4.4. A.1 the breaker for standby liquid J

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y g,3 j ; control pump B motor tripped when the pump was started. Reference T.S. 3.4.B.l.

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g g l SLC pump A was available. There was no danger to the health or safety of the I

public. There were no significant resulting events. No previous occurrence.

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CAUSE

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li;n;l Overcurrent tripping device on B phase was tripping at a lower value than other g,;,jl phases. Breaker was replaced. No recurrence control required. CE overcurrent g ; trify'g device, type EO-2A, Model 0549D0497G-1, Size 90 amp 6-12-9x.

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Tennessee Valley Authority Form BF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLEbENTAL INFORMATION

(

BFRO 296 /

8050 Technical Specification Involved 3.4.B.1 Reported Under Technical Specification 6.7.2.b(2)

Date of Occurrence 11/15/80 Time of Occurrence 1930 Unit 3

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Identification and Description of Occurrence:

While performing S.I. 4.4. A.1 the breaker for standby liquid control pump B motor tripped when the pump was started.

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Canditions' Prior to Occurrence:

Unit 1 @ 99%

Unit 2@ 0% refueling outage l-a Unit 3 @ 86%

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Equipment required by Technical Specification 4.4.B.1 was proven operable.

IE Bulletin 80-17 prompt report was made.

Apparent Cause of Occurrence:

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Overcurrent tripping device on B phase was tripping at a lower value than other phases.

Analysis of Occurrence:

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.

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Corrective Action

NA 4

Foilure Data:

• Retention:

eriod - Lifetime; Responsibility - Administrative Supervisor

• Revision:

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