ML20085G447

AO BFAO-7316W:on 730926,while Investigating Cause of Stack Gas Flow Abnormal Alarm,Stack Gas Monitor a Pump Motor Failed.Caused by Bad Motor Bearing Causing Motor Overload & Overheating.Motor & Fuse Replaced

ML20085G447
Person / Time
Site:	Browns Ferry
Issue date:	10/05/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
References
AO-BFAO-7316W, NUDOCS 8308290091
Download: ML20085G447 (2)

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tuI Directorate of Licensing M-Office of Regulation U.S. Atccie Energy Connicsion hA . '\ Washington, DC 20545 T/ " ' Dear 11r. O'Inary. TrLT.iCSSE3 VALLEY AUTEORITY - E2C'!KS FC'tRY HUCLEldt PLCf U::IT 1 - DOCiO.:T NO. 50-259 - FACILITY OPER.3.TlHG LICECSr.; DPR AEI:CReAL OCCUR {E.:C2 RAPORT EFAO-7316W The purpoco of thie report is to provide details concerning the failure of the ctack gas monitor. This occurrence vac reported to W. S. Little by telephone on September 27,19'/3, and by telegram to the Region II Directorate of Regulatory Operations on Septenber 28, 1973 , D2scrintion of the Incident At 6 p.u. on septe=ber 26, 1973, while the operator was invecti6atinS the cause of the alara " Stack Gar Flow Abnormal," he dicccvered tr.at etack gas renitor A ptrnp notor had failed, vnich stopped cample flov to the nonitor. When he attempted to start B cample pump, it would not start. Further investigation showed the pover cupply fuse which supplies both pumps had blova. The fute was replaced and E pump vas placed in cervice. The reactor was operating at 150-psig pressure during low-power startup testing. Invectication and Corrective Action The stack gas monitor has two cumple pumps, one of which must operate continuoucly. Eoth pumps are cupplied fro.n a cingle ccurce of pcVer through one 20-tsp fuce and a pump cclectcr cuitch. The pump motor failure was due to a bad cotor bearing which caused motor overload and overheating which reculted in vinding failure. The motor vce replaced and the system returned to normal operation. I y .(\; s G4 s t\ . E .a( a 8308290091 731005 PDR ADOCK 05000259 )k'Y b /f l S PDR Cun Rn 11G10h_ 2

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Mr. John F. O'Irary October 5, 1973 TEN!! DSS'JE VliT.I.i?l /JIIEORITY - Eh0'.CS FrJtRY I':UCIS/Jt PIZ:T U:ilT 1 - DCCKET I:0. 50-259 - FACILITY OPERATI;;G LICE::SE DPit la::CID E CCCURRE: ICE R5PCdf eft.0-73164 Increated frequency of inspectica was bcGun which chould det/ct totor bearing or other failure in early steges. The circuit is being redecicned to improve tne po'.:cr rupply. Very truly youra, TSNN:JSCES VAIE AUTEORITY s.)

            .     .W E. F. Tnoc.ns Director of Fower Production                                                  t CC: Isr. I:orr.nn C. ::oceley, Director IMgion II Regulatog Operations Office,'USAEC 250 Pc;c::Lree d reet,    4 ?. ' .

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