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PHILADELPHIA ELECTRIC COMPANYOh3 PLACll DOTIOM ATOMIC POWER sThrlON

R. D. I, Box 208~

; 'i it % Delta, Penmylvania 17314

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october lo, 1990

Docket No. 50-278

Document Control DeskU. S. Nuclear Regulatory CommissionWashington, DC 20555

SUBJECT: Licensee Event ReportPeach Bottom Atomic Power Station - Unit 3

This LER concerns High Pressure Coolant Injection System inoperability dueto a dirty relay contact in the Auxiliary 011 Pump Motor starter.

Reference: Docket No. 50-278Report Number: 3-90-011Revision Number: 00Event Date: 09/10/90

; Report Date: 1o/1o/90l Facility: Peach Bottom Atomic Power Station

RD 1 Box 208, Delta PA 173141

This LER is being submitted pursuant to the requirements.of 10 CFR50.73(a)(2)(v).

Sincerely.

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/cc: J. J. Lyash, USNRC Senior Resident Inspector-

T. T. Martin, USNRC, Region I

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C. A. McNeill, Jr. - S26-1 PECo President and C00|D. B. Miller, Jr. - SM0-1, Vice President - PBAPS >

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J. Urban. Delmarva Power'

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High Pressure Coolant Injection System Inoperablo Duw 'to Dirty Relay Contact inAuxiliary oil Pump Motor Starter

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On 9/10/90, at 1900 hours with Unit 3 operating at approximately 80% licensed reactorpower, the High Pressure Coolant Injection (HPCI system auxiliary oil pump (AOP)failed to start as required during the performanc)e of ST 6.5.1, " Auxiliary 011 PumpSurveillance", failure of the AOP to start prevents the HPCI turbine stop andcontrol valves from opening, thus preventing HPCI from operating as designed. The ;

cause of the event was a bound relay in the AOP local motor starter due to dirt inthe relay mechanism.A contributing cause was the lack of prevent maintenance (PM)on the local motor starter. The relays in the local motor starter panel werecleaned. HPCI was declared operable at 1750 hours on 9/11/90 following thesatisfactory completion of ST 6.5.1, No actual safety consequences occurred as aresult of this event. No previous similar LER's were identified,

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Requirements for the Report |;

| This LER is being submitted pursuant to 10 CFR 50.73 (a)(2)(v) to report conditions |with the potential to prevent the High Pressure Coolant Injection system (E!!S:BJ) '

|from fulfilling its design safety function. ;

Unit Status at Time of the Report

i| Unit 3 was operating at 80% licensed reactor power.

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Description of Event

On 9/10/90 at 1900 hours, during the performance of S'I 6.5.1, " Auxiliary 011 Pump !

Surveillance," the High Pressure Coolant Injection (NPCI) Auxiliary oil pump (AOP); (30P26)(E!!S:P) failed to start, thus requiring the H9CI system to be declared '

inoperable. The start of the A0P is required for the opening of the HPCI turbinestop (E!!S:V) and control valves (Ells:FLV). Thus, a failure of the AOP to startprevents HPCI from operating as designed.

Following the failure, the Shift Technical Advisor (STA) was dispatched to !

investigate. At 2020 hours the STA discovered that the motor starting resistor ,

timeout auxiliary (TA) relay (EIIS:RLY) in the AOP motor local starter panel(Ells:PL) appeared to be mechanically bound. The STA proceeded to exercise therelay, and the A0P was subsequently started successfully several times. ;

'On 9/11/90, at 0800 hours, a maintenance request was initiated to investigate thecause of the failure of the A0P to start. This investigation revealed no noticeable

| problems with the "TA" relay or the main (M) A0P starting contactor relay *

(Ells:MSTR). Both relays were cleaned, along with the local starter panel, and theA0P was successfully started five times. At 1750 hours, on 9/11/90 ST 6.5.1 wasperformed satisfactory and the HPCI was declared operable.

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The A0P local starter panel is manufactured by Cutler Hammer, catalog number6130H261A and is rated at 250 VDC, 29 amps, 7.5 HP.

Cause of the Event|

The cause of the event was the binding of the "TA" relay. It is believed that the-binding was a result of dirt in the relay mechanism. A contributing cause of thisevent was the lack of preventive maintenance (PM) for this local motor starter. The

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A0P local motor starter is unique in that it is the only safety related motor starterwhichisnotlocatedinamotorcontrolcenter(MCC). Safety related MCC have PMtasks for periodic cleaning of their components. Therfore, PM for the AOP localmotor starter appears to have been overlooked.

Analysis of the Event

No actual safety consequences occurred as a result'of this event.i

The failure of the A0P to start prevents the HPCI system from starting eithermanually or automatically when required. The HPCI system is designed to mitigate a

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small line break at nigh reactor vessel (EIIS:RPV) pressures. Had such an eventoccurred with the '40P inoperable, the reactor core isolation cooling (RCIC)(EIIS:BN)and automatic depressurization system (ADS)(Ells:RV) would have been available toprovide reactor core cooling, and if required, reduce reactor pressure to allow thelow pressure injection systems (Ells:BO) to initiate.

Corrective Actions

HPCI was declared operable at 1750 hours on 9/11/90 following the satisfactorycompletion of ST 6.5.1.

A preventive maintenance (PM) task was created to periodically clean and adjust the"M" and "1A" relays and clean the local panel in which the A0P starter is containedon both unit 2 and 3. SimilarPMtaskswerecreatedfortheother(nonsafetyrelated) local starter panels on the HPCI and RCIC system.

Previous Similar LER's

No previous similar LER's were identified in which the HPCI system was inoperable dueto a failure of the auxiliary oil pump to start. '

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