05000368/LER-1980-089-03, /03L-0:on 801205,steam Generator Levels Found Dropping.Loss of Feedwater Flow Found in Electric Driven Emergency Feedwater Pump 2P7B.Caused by Radial & Thrust Bearing Failure in Pump Shaft.Pump Assembly Rebuilt

/03L-0:on 801205,steam Generator Levels Found Dropping.Loss of Feedwater Flow Found in Electric Driven Emergency Feedwater Pump 2P7B.Caused by Radial & Thrust Bearing Failure in Pump Shaft.Pump Assembly Rebuilt

ML19340D890
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/26/1980
From:	Shively C ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19340D845	List: 05000368/LER-1980-089, Forwards LER 80-089/03L-0 05000368/LER-1980-089-03, /03L-0:on 801205,steam Generator Levels Found Dropping.Loss of Feedwater Flow Found in Electric Driven Emergency Feedwater Pump 2P7B.Caused by Radial & Thrust Bearing Failure in Pump Shaft.Pump Assembly Rebuilt
References
LER-80-089-03L, LER-80-89-3L, NUDOCS 8101050519
Download: ML19340D890 (1)

LER-1980-089, /03L-0:on 801205,steam Generator Levels Found Dropping.Loss of Feedwater Flow Found in Electric Driven Emergency Feedwater Pump 2P7B.Caused by Radial & Thrust Bearing Failure in Pump Shaft.Pump Assembly Rebuilt

Event date:
Report date:
3681980089R03 - NRC Website

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EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h 1042 1 Durina Mode 3 operation, with plant cooldown in progress, steam ceneratori io ia i i levels beaan dropoina and it was observed that the electric driven emer-1 io n i i gency feedwater pump 2P7B, had no flow or discharge pressure.

Pump 2P7Bt le ! s i ! was being utilized for feedwater supoly oer normal cooldown orocedures.

I Ie is 1 l Pump was declared inocerable and the steam driven EFW oumo. 2P7A. and i

l o iii i condensate oumos were used.

No similar occurrences.

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CAUSE DESCR.PTION AND CCR AECflVE ACTIONS l

I s ic t IInvestigation revealed that the loss of feedwater flow was due to a failes i,liiipump shaft.

The pump failure was caused by heat stress due to a failure,

i,i: l I of the radial & thrust bearinas.

The root cause of the bearing failures l i,;3: l is being investigated.

The pump rotating assembly was rebuilt and the i

tiuilDumo returned to operable status.

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