05000259/LER-1980-036-03, /03L-0:on 800422,during Steady State Conditions, 1B Recirculation Motor Generator Set Tripped During Transfer from Alternate to Normal Power Source.Cause Unknown.Transfer Later Accomplished W/No Problems

/03L-0:on 800422,during Steady State Conditions, 1B Recirculation Motor Generator Set Tripped During Transfer from Alternate to Normal Power Source.Cause Unknown.Transfer Later Accomplished W/No Problems

ML19323F770
Person / Time
Site:	Browns Ferry
Issue date:	05/21/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19323F767	List: 05000259/LER-1980-036, Forwards LER 80-036/03L-0 05000259/LER-1980-036-03, /03L-0:on 800422,during Steady State Conditions, 1B Recirculation Motor Generator Set Tripped During Transfer from Alternate to Normal Power Source.Cause Unknown.Transfer Later Accomplished W/No Problems
References
LER-80-036-03L-01, LER-80-36-3L-1, NUDOCS 8005290451
Download: ML19323F770 (2)

LER-1980-036, /03L-0:on 800422,during Steady State Conditions, 1B Recirculation Motor Generator Set Tripped During Transfer from Alternate to Normal Power Source.Cause Unknown.Transfer Later Accomplished W/No Problems

Event date:
Report date:
2591980036R03 - NRC Website

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Go 61 DOCKET NLNSER 68 69 EVENT DATE 74 75 AEPORT OATE 83 EVENT DESCRIPTION AND PROSABLE cCNSEQUENCES h I o 121 l During steady state conditions 1B recirculation MG set tripped during a transfer i

lol31 l from alternate to normal power source. Normal supply breaker did not close.

lo(41l Reference T.S.3.6.F.1.

This caused a power reduction for approximately 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.

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cAUSE DESCAIPTION AND CORRECTIVE ACTIONS W l Cause of failure to transfer is unknown. The normal supply breaker was inspected I

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S.I. 4.6.A.6&7 was run prior to restarting 1B MG set.

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Tennessee Valley Authority Form DF-17 Browns Ferry Nuclear Plant BF 15.2 1/10/79 LER SUPPLEMENTAL INFORMATION BFRO 259 / 8036 Technical Specification Involved 3.6.F.1

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Reported Under Technical Specification

6. 7. 2.b (2)

Date of Occurrence 4/22/80 Time of Occurrence 0602 Unit 1 Identification and Descrip_ tion'of Occurrence:

Recirculation MG set 1B tripped during a transfer from alternate to normal power source.

Conditions Prior to Occurrence:

Unit 1 @ 22%

Unit 2 @ 95%

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Unit 3 @ 98%

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

NA Apparent Cause of Occurrence:

The cause of failure to transfer is unknown.

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.

s

Corrective Action

The normal supply breaker was inspected and no problem found.

S.I.4.6.A.6&7 i

was run prior to restarting the 1B MG set.

On a subsequent startup the MG set supply breakers transferred normally with no problems.

Fuilure Data:

NA

• Reten tion :

Period - Lifetime; Responsibility - Administrative Supervisor

• Revision:

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