05000259/LER-1979-016-03, /03L-0:on 790804,during Normal Operation,Starter Bus 1B Normal Feeder Breaker Found Discharged,Making Breaker Inoperable for Closure.Caused by Damaged Breaker Spring Charging Motor Commutator.Motor Replaced

/03L-0:on 790804,during Normal Operation,Starter Bus 1B Normal Feeder Breaker Found Discharged,Making Breaker Inoperable for Closure.Caused by Damaged Breaker Spring Charging Motor Commutator.Motor Replaced

ML20136B729
Person / Time
Site:	Browns Ferry
Issue date:	08/31/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20136B727	List: 05000259/LER-1979-016, Forwards LER 79-016/03L-0 05000259/LER-1979-016-03, /03L-0:on 790804,during Normal Operation,Starter Bus 1B Normal Feeder Breaker Found Discharged,Making Breaker Inoperable for Closure.Caused by Damaged Breaker Spring Charging Motor Commutator.Motor Replaced
References
LER-79-016-03L-01, LER-79-16-3L-1, NUDOCS 7909110449
Download: ML20136B729 (2)

LER-1979-016, /03L-0:on 790804,during Normal Operation,Starter Bus 1B Normal Feeder Breaker Found Discharged,Making Breaker Inoperable for Closure.Caused by Damaged Breaker Spring Charging Motor Commutator.Motor Replaced

Event date:
Report date:
2591979016R03 - NRC Website

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dRc soRuge U. S. NUCLE AM E!ULATZ2Y COMMISSION t.lCENSEE EVENT REPORT l

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\\ l (PLEAsE PRINT OR TYPE ALL REQUIRED INFORMATIONI TITI l A l L l B l R l F l 1 l@l 0 l 0 l-l 010 l 0 l 0 l 0 l

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.e EVENT DATE 7%

e4CPQA T OAT E SO EVENT DESCRIPTION AND PR08ASLE CONSEQUENCES h o 2 1 During normal operation the breaker closure spring for start bus "1B" normal feeder I

I breaker was found to be discharged. This made the breaker inoperable for closure I

o I which placed start bus "1B" in an abnormal condition contrary to T. S. 3.9.B.

The o n I

o s I diesel generators vera verified operable. There was no effect on public health and I

o e isafety. There have been no previous occurrences; I

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2 CAUSE DESCRIPTION ANDCORRECTIVE ACTIONS 27 i o lThe start bus "1B" normal feeder breaker sprine charrine motor commuester had a hole E lburned in it.

This caused the close circuit control fuses to bicy aM aten inre ek.

I l closure spring in a discharge condition. The motor. CE 105C9393 P3 was reolaced and l lthe breaker returned to service.

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. T ennes::ec Valley Authority For::: DF-17 Drowns Ferry. Nuclear Plant DF 15.2 1/10/73 LER SUPPLEME.dTAL INFOIDIAT;ON DFRO 259 /

7916 Technical Speedication Involved T. S. 3.9 Reported Under Technical Specification T.S. 6.7.2.b.2 Date of Occurrence 8/4/79 Time of Occurrence 0715 Unit 1&2 Identification and Description of Occurrence:

Start bus "15" normal feeder breaker closura spring charging motor burned out.

The closure spring was found discharged.

dondit!<:,ns Prior 13.O._ccurs c::ce:

USit 1 preconditioning to full load (63%).

i Unit 2 at full load (98%).

1 Action specif!:.i in thu Techn! cal Specific?tien Surveillance Requirements met due to tnepetable equipment. Describe.

Ran SI 4.9.A.la supplement A on diesel generators.

Apparent Cause of Occurrence:

Spring charging motor commutator

• burned up.

Analysis of Occurrence:

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l por,reettve Actken:

Spring motor was replaced.

,Failur e D st..:

No previous occurrences.

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