ML20147G153

Ro:On 880302,both Fire Pumps Became Inoperable When Breaker E-224 for Motor Driven Fire Pump Tripped.Diesel Driven Fire Pump Taken Out of Svc for Maint on 880301.Caused by Failure of Bus E-22 Undervoltage Relay.Temporary Jumpers Installed

ML20147G153
Person / Time
Site:	Peach Bottom
Issue date:	03/03/1988
From:	Franz J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Russell W NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8803080144
Download: ML20147G153 (2)

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' PHILADELPHIA ELECTRIC COMPANY +

PEACH BOTTOM ATOMIC POWER ST ATION p ' R. D.1. B O X 2 08 DELT'APENNSYLV ANI A 173 8 4 '

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. March 3, 1988l-W. T. Russell, Administrator United States Nuclear Regulatory Commission

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Region 1-

.- ATTN: Document Control Desk

- , Washington,.D.C. '20555

SUBJECT:

'REPORTABt.E OCCURRENCE - Both Fire Pumps Out Of Service At Peach Bottom Atomic Power Station'

Dear Mr. Russell:

Confirming Shift Manager telephone conversation with Mr. Smith,

. Duty Officer, Region 1. United States Nuclear Regulatory Commission on 3/2/88.

~ Re fe rence : Docket No. 5-277/278 Peach Bottom Units 2 and 3 Technical Specifications 3.14.A.3 b.

Identification of occurrence:

The diesel driven fire pump was taken out of service for maintenance at'10:30 PM on March I, 1988. At 9:04 PM on March 2, 1988, the-motor. driven fire pump-became inoperable when the E-224 breaker tripped.

At this time;.both fire pumps were inoperable. The Technical Specifications require that if both fire pumps are inoperable, the NRC must be notified

, by telephone and-in writing.

Conditions Prior to Occurrence:

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. Unit 2 cold shutdown

. Unit 3 refuel Apparent Cause of Occurrence:

' The breaker feeding the motor driven fire pump, E-224 breaker, tripped as a result of the failure of the E-22 bus undervoltage relay.

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LCorrective Action:

At-19:34 PM,'the breaker automatically-reclosed. Due to the suspected. .

unreliability of'the E-22 bus, temporary jumpers were installed at 5:03/AM to supply the E-224 load center from the E-424 load center. Both fire pumps were out-:of service' for 30 minutes.

Previous Occurrence:

On June 29, 1984,.both fire pumps were inoperable due to a fire header break in the' Turbine Building. On July 31, 1987, both fire pumps were inoperable due to repairs that were being made to the fire header.

Very truly yours,-

. ./F z g . Plant Manager WW die JFF/DDS/ DAB:waf Tac.

cc: T. P. Johnson, NRC Resident Inspector l

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