ML20084S242

Telecopy Ao:On 750729,RHR Sys Svc Water Pump 2A Failed to Meet Tech Specs Required Flow Rate.Work Request 2794-75 Immediately Issued for Investigation & Repair.Further Info to Be Provded in AO 50-265/75-28

ML20084S242
Person / Time
Site:	Quad Cities
Issue date:	07/30/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S240	List: ML20084S237 ML20084S242
References
NJK-75-386, NUDOCS 8306160316
Download: ML20084S242 (2)

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nr70RTMlVMBER: A0-50-265/75-28 REPORT DATE: August 8, 1975 OCCURREtlCE DATE: July 29, 1975 FACILITY: Quad-Citics flucicar Power Station Cordova, IL 61242 IDEtlTIFICATI0il 0F GCCURREilCE:

2A Residual Heat Removal (RHR) System Service Water Pump inoperable.

I C0flDIT10!!S PRIOR TO OCCURREllCE: l Unit two was in the RU!! mode with 1949 PWt and 605 MVc. .

DESCRIPTIO'l 0F OCCURREtlCE: 1 On July 29, 1975, at 9:00pm, while performing surveillance on 2A RHP Service Vater Pump, the pump pressure was 198 psia and the flow was 2850 GPM. Technical Specification 4.5.B.I.b rcquires the pump to deliver at least 3500 GPM against a pressure of 198 psia. Because 2A RilR Service Vater Pump did not comply to Technical Specification requirements the pump was removed from service and surveillance testing required for an Inoperable RHR Service Water Pump was commenced.  !

DESIGflATI0ff 0F APPAREtlT CAUSE OF OCCURREtlCE:  ;

Equipment Failure - ,1 I

2A RHR Service Vater Pump's flow was reduced by an accumulation of debris consisting of pieces of wood lodged in the pump suction and impeller.

ANftLYSIS OF OCCURREllCE:

As stated in the basis for the limiting condition for operation of the RHR service water pumps, i the loss of one pump does not "scriously jeopardize the containment cooling capability". Since all three of the other RHR service water pumps were operable, system redundancy was still main-tained. {

l The safety implications were also minimized by the fact that the pump was only Inoperable for f seven days and thirty days are allowed for repair by Technical Specifications. There were no  ;

abnormal radiation exposures to plant personnel, and there was no effect on the health and  !

safety of the public as a result of this occurrence.

CORRECTIVE ACTl0ti:

2A RHR Service Water Pump was removed from service, disassembled and inspected. The debris found in the pump suction and impeller was removed. The pump was reassembled and returned to

,ervice on August 5, 1975, at 3:;.' pm. It was then tested at a flow of 3600 GPM and a pressu're of 200 psia, both of whica exceed the Technical Specification requirements.

8306160316 750808 PDR ADOCK 05000265 S PDR L _

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3 2-FAILURE DATA:

There have been 2 previous cases of inoperable RHR Service Water Pumps. In both cases the pumps would not start due to electrical problems. There has been no previous case of an RilR Service Water Pump failing to meet flow requirements; therefore, there are no safety impIicatIons resulting from cumulative expericnce.

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