05000368/LER-1980-078-03, B HPSI Pump 2P89B Tripped on Overcurrent.Caused by Motor Bearing Misalignment on Inboard Motor Bearing.Rotor Balanced & Motor Bells Replaced

B HPSI Pump 2P89B Tripped on Overcurrent.Caused by Motor Bearing Misalignment on Inboard Motor Bearing.Rotor Balanced & Motor Bells Replaced

ML19351E641
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/04/1980
From:	Pendergraft R ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19351E635	List: 05000368/LER-1980-078, Forwards Revised LER 80-078/03X-1 05000368/LER-1980-078-03, B HPSI Pump 2P89B Tripped on Overcurrent.Caused by Motor Bearing Misalignment on Inboard Motor Bearing.Rotor Balanced & Motor Bells Replaced
References
LER-80-078-03X, LER-80-78-3X, NUDOCS 8012100560
Download: ML19351E641 (1)

LER-1980-078, B HPSI Pump 2P89B Tripped on Overcurrent.Caused by Motor Bearing Misalignment on Inboard Motor Bearing.Rotor Balanced & Motor Bells Replaced

Event date:
Report date:
3681980078R03 - NRC Website

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=0 EVENT DESCRIPTION AND PROSA0LE CONSEQUENCCS h i During Mode 1 operation while performing the monthly surveillance test I

o 2 1 on "B" HPSI pump (2P898), the Dump tripped on cvercurrent.

The "C" HPSI I o 2 toi.ii pump was alianed to supply the loop II HPSI sysj g _ 2P89A and 2P89C 1

in is j t were verified operable satisfying the requirements of Tech. Spec. 3.5.2. I i There have been no similar occurrences.

Reportable per Tech. Sp_ec.

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C AUSE OESCR.PiiOu AND CORaEcove cTiONs @

I Investication revealed a motor bearina misalianment on the inboard motor i i o LT~I] 1 bearina.

This misalianment caused hiah bearina loadina and an over-i Frr,1 icurrent trip.

Hiah bearina loadina was due to sliaht rotor imbalance; i

3 I bearing support misalignment and excessive end bell tolerance.

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