ML20195G511

Special Rept:On 881017,fire Suppression Sys Electric Fire Pump Declared Inoperable.Pump Could Not Be Returned to Operable Status within 7 Days.Cause Under Investigation. Replacement Motor Installed & Pump Declared Operable

ML20195G511
Person / Time
Site:	Pilgrim
Issue date:	11/15/1988
From:	Bird R BOSTON EDISON CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
88-156, NUDOCS 8811230439
Download: ML20195G511 (3)

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l-l BOSTON EDISON Pilgrirn Nuclear Power station Rocky Hill Road Plymouth, Massachusetts 0236o Ralph G. Bird sencr Vice President - Nuclear November 15, 1988 BECo Ltr. #88 156 U.S. Nuclear Regulatory Commission Docket No: 50-293 Document Control Desk License No: DPR-35 Hashint in, DC 20555

SUBJECT:

Special Report . inoperable Electric Fire Pump

Dear Sir:

This special report is being submitted in accordance with Pilgrim Nuclear Power Station Technical Specification 3,12.B.a. The report is required because the Fire Suppression System Electric Fire Pump (EFP) was declared inoperable on October 17, 1988 at 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> and could not be returned to operable status within seven days. The EFP was declared inoperable when metal shavings were fou"d in the motor bearing grease during a preventive maintenance inspection. Refer to Attachment I for further details.

During the period that the EFP was inoperable, the plant was in the cold shutdown condition, and the reactor vessel head was installed. The Diesel l

Fire Pump was in standby and capable of autostart and function. The EFP motor was replaced and returned to operable status on November 10, 1988.

Please do not hesitate to contact me if you have any questions regarding this subject.

hah R. G. Bird JLK/bal r]!k s e m m- < \

7-U.S. Nuclear. Regulatory Commission Docket No:'50-293 License No: DPR-35 Page 2 cc: Mr. Hilliam T. Russell Regional Administrator, Region I U.S. Nuclear Regulatcry Commission 475 Allendale Road King of Prussia, PA 19a06 Mr. D.G. Mcdonald, Project Manager Division of Reactor Projects I/II Office of Nuc1 car Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop: 14D1 One White Flint North 11555 Rockville Pike Rockville, MD 20852 Senior NRC Resident Inspector Pilgrim Nuclear Power Station 4

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ATTACHMENT I Boston Edison Company Docket No. 50-293 Pilgrim Nuclear Power Station License No. DPR-35 The water supply to the Fire Suppression System is delivered by either the F.FP or the diesel driven fire pump (DFP). Tne DFP is redundant to the EFP and is available for standby and emergency use (loss of AC power). The EFP and DFP are each rated at 2,000 gallons per minute and discharge to the 12" Fire Suppression System header.

The EFP was declared inoperable on October 17, 1988 at 2330 hours0.027 days <br />0.647 hours <br />0.00385 weeks <br />8.86565e-4 months <br /> following the discovery of metal shavings in the motor bearing grease. The discovery was made during a preventive maintenance inspection being performed under Mainter,ance Request 88-33-283. Failure and Halfunction Report 88-273 was written to document the problem.

During the period that the EFP was inoperable, the DFP surveillance was verified to be current and the DFP was in standby and capable of autostart and function. Further, the Pilgrim Station Fire Truck was off-site for preventive maintenance. The maintenance facility was contacted and notified of the potential need for the fire truck on short notice. The truck was maintained

", in a ready-to-drive state, approximately one hour from Pilgrim if needed.

Additional precautions included postponement of certain surveillances that required starting of the diesel fire pump to avoid risks to the equipment should it be required for an emergency in the absence of the EFP. These measures are consistent with Procedure Number 2.5.54, "Loss of All Fire Suppression Pumps or Loss of Redundancy in the Fire Water Supply System". The procedure outlines immediate and subsequent operator actions that include measures to be taken when a loss in redundancy of the Fire Suppression System pumps occurs. The measures are commensurate with the degree of loss of redundancy and are determined by the Hatch Engineer in consultation with the Fire Protection and Prevention Officer (FPPO) or designee.

Tho cause of the metal shavings is currently under investigation. A replacement motor for the EFP was installed and the pump declared operable on November 10, 1988.

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