ML20084H903

AO BFAO-7416W:on 740312,HPCI Egm Box Failed.Caused by Defective Transistor.Transistor Replaced

ML20084H903
Person / Time
Site:	Browns Ferry
Issue date:	09/12/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Case E US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084H906	List: ML20084H903 ML20084H908 ML20084H912
References
BFAO-7416W, NUDOCS 8305060132
Download: ML20084H903 (2)

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TENNESSEE VAf ley AUTHORITY r*"3 h--* '"

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/,f[3 h9 1 panymnse September 12, 1974

,p fSg Mr. Edson G. Case $ I[W.

Acting Director of Licensing 3 ,1

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Dear Mr. Case:

TZTITESSEE VALLEY AUTHORITI - BROWS FERRY ITUCLEAR PLMIT WIT 1 -

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DOCKET NO. 50-259 - FACILITY OPERATIIiG LICEITSE DPR ABNORMAL l OCCURRENCE REPORT BFAO-7416W '

This refers to ry letter to John F. O' Leary dated March 21, 1974, on this cubject. Tne initial 10-day report submitted to 12C on March 21 left an open item because the cauce of failure we.c still under investigntion. The information contained herein is intended to clo::e out that item.

Very truly yours, '

TDEESSEE VALLEY AUDIORITI:

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E. F. Thomas -

Director of Power Production Enclo::ure CC(Enclosure):

Mr. Norman C. Mocoley, Director Region II Regulatory Operations Office, US/20 230 Peachtree Street, Int. , Suite 818 Atlanta, Georgia 30303 3 ,,}$f -

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8305060132 740912 PDR ADOCK 05000259

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AENOR!?AL OCCURRETOE REPORT Report lio.: BFAO-7416W (Final Report)

Report Date: September 12, 1974 Occurrence Date: March 12,19'/4 Facility: Browns Ferry Iiuclear Plant unit 1 The initial 10-dcy report left en open iten. The cause of the EGM control box failure was still under investigation at the tiuo of the report. The following information is intended to close out the open item.

Designation of Aunnrent Cr>nse of Occurrence Investigation has shown that the cause of failure of the HPCI EGM box was a defective transistor. This transistor gives an output signal to the governor actuator when an increase in speed is called for.

Corrective Action The trcn:1stor was replaced and the D3M cutputs verified. Calibration was verified n 4 the box considered repaired and available for use.

Failure Data Transistor: 217696 l

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