ML19242A863

LER 79-042/03L-0 on 790713:RHR Svc Water Pump 10-P-1A & 10-P-1C Could Deliver Only 7800 Gallons Per Minute.Caused by Installation of Improper Orifice in RHR Svc Water Discharge Line.Orifice Removed & Willbe Modified

ML19242A863
Person / Time
Site:	FitzPatrick
Issue date:	08/03/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19242A859	List: ML19242A858 ML19242A863
References
LER-79-042-03L, LER-79-42-3L, NUDOCS 7908060500
Download: ML19242A863 (2)

Text

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• POwl,R AtJI110RIIT OF TllE STATE OF NE W . 4 JAMES A. FIT ~ PATRICK NUCLEAR POWER PL,6T DOCKET NO. 50-333 ATTACHMENT TO LER 79- 04 2/ 03 L- 0 Page 1 of 1 hhile in a cold shutdown condition, during the conduct of Operations Surveillance Test F-ST-2R titled "RHR Service Water Pump and MOV Operability Test (ISI)", RHR service water pump 10-P-1A and 10-P-1C could be shown to deliver only 7800 gallons per minute with the common discharge throttle valve in the full open position. Tech-nical Specifications Appendix A, Paragraph 4.5.B.1 requires that these pumps be capa-ble of delivering equal to or greater than 8000 gpm.

Investigation revealed that during a plant modification an orifice was installed in tha RHR service water discharge line in order to increase differential pressure across radiation monitors. This orifice sizing change resulted in marginal btit satisfactory pump performance.

The redundant RHR service water pumps (10-P-1B and 10-P-ID) were demonstrated operabic in accordance with Technical Specifications, therefore, the event did not represent any significant hazard to the public health and safety. c As a temporary measure, the restricting orifice in the discharge line has been removed and will be modified by increasing the size to restore pump performance to an acceptable IcVel. In additien, investigation indicates that the seasonal _ low level of the ultimate heat sink for the Fit: Patrick Plant (Loke Ontario) may be a contributing factor in that the suction head available to the pumps is somewhat lower than observed during earlier conduct of the same test. Further investigation asscciated with this Licensee Event Report and LER 70-024 which described inadequate discharge head for an Emergency Service Water Pump will be taken into consideration and the details of any corrective action wi11 be provided in a follow-up report.

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