05000366/LER-1981-032-03, /03L-0:on 810410,HPCI Auxiliary Oil Pump Tripped During Second HPCI Sys Manual Initiation.Caused by Coil Failure in Time Delay Relay Not Allowing Relay Contact.Coil Replaced,Pump Rerun & Design Change Initiated

/03L-0:on 810410,HPCI Auxiliary Oil Pump Tripped During Second HPCI Sys Manual Initiation.Caused by Coil Failure in Time Delay Relay Not Allowing Relay Contact.Coil Replaced,Pump Rerun & Design Change Initiated

ML20008F974
Person / Time
Site:	Hatch
Issue date:	05/05/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20008F970	List: 05000366/LER-1981-032, Forwards LER 81-032/03L-0 05000366/LER-1981-032-03, /03L-0:on 810410,HPCI Auxiliary Oil Pump Tripped During Second HPCI Sys Manual Initiation.Caused by Coil Failure in Time Delay Relay Not Allowing Relay Contact.Coil Replaced,Pump Rerun & Design Change Initiated
References
LER-81-032-03L, LER-81-32-3L, NUDOCS 8105120418
Download: ML20008F974 (2)

LER-1981-032, /03L-0:on 810410,HPCI Auxiliary Oil Pump Tripped During Second HPCI Sys Manual Initiation.Caused by Coil Failure in Time Delay Relay Not Allowing Relay Contact.Coil Replaced,Pump Rerun & Design Change Initiated

Event date:
Report date:
3661981032R03 - NRC Website

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etEPOHT DAIE WJ EVENT DESCnlPTION AND PnODABLE CONSECUENCES h O 2 l

On April 10, 1931, while performing HilP-2-2001, Reactor Scram Recovery, l

io l3l l the HPCI (High Pressure Coolant Injection) System was auto initiated and l

l0 l4 l l ran successfully; however, on the second manual initiation, the HPCI l

O s l Auxiliary Oil Pump tripped.

Personnel immediately reset the breaker and l

O s l successfully started the pump.

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l0 l2l l on Reportable Occurrenct Report flo. 50-366/1980-016.

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l0ial l safety was not affected by this incident.

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36 34 43 di 42 43 44 47 CAUSE DESCRIPTloN AND CORRECTIVE ACTIONS h li l0 l l The cause of the breaker tripvas due to a coil failure in a time delay re-I lil ll lay. This would not allow the relay contact, used to series resistance in I

i,,,,l the motor armature, to open. The coil was replaced and the pump was run l

l,l3ll successfully. A design change has been initiated to help reduce the possi-l l

bility of this event from re-occurring.

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LER No. : 50-366/1981-032_

licensee: Georgia Power Company.

facili ty: Edwin I. Hatch Docket No.: 50-366

Narrative

Report for LER 50-366/1981-032' On April 4,1981, during a reactor scram recovery, the HPCI Auxiliary

'HPCI had run 011 Pump tripped when initiated for the second time.

.successfully on an auto initiation,~ but the auxiliary oil pump tripped on a following manual initiation.

Personnel-immediately reset the breaker and sucessfully started the pump.- This is a-repetitive event

'7 as last reported on Reportable Occurrence 50-366/1980-016.

Publ ic - heal th -

and safety was not affected by this incident.

An investigation into the cause of the breaker trip-revealed that the coil of a time dalay relay had failed.

This relay is used to series resistance -in the motor armature.

A design change has been initiated to help reduce the possibility of the event from re-occurring.

[

This event 'is not applicable to Unit I due to the utilization of different.

components for the HPCI Auxiliary Oil Pump.

]

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