05000335/LER-1978-034-03, /03L-0 on 780902:during Short Maint Shutdown, Charging Pump 1A Was Found to Have Cracked Pump Casing, Probably Due to Suction cavitation.1Apump Casing Will Be Replaced & Damping Device Installed on Pump Suction Line

/03L-0 on 780902:during Short Maint Shutdown, Charging Pump 1A Was Found to Have Cracked Pump Casing, Probably Due to Suction cavitation.1Apump Casing Will Be Replaced & Damping Device Installed on Pump Suction Line

ML17206A475
Person / Time
Site:	Saint Lucie
Issue date:	10/02/1978
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:
Shared Package
ML17206A474	List: 05000335/LER-1978-034, Forwards LER 78-034/03L-0 05000335/LER-1978-034-03, /03L-0 on 780902:during Short Maint Shutdown, Charging Pump 1A Was Found to Have Cracked Pump Casing, Probably Due to Suction cavitation.1Apump Casing Will Be Replaced & Damping Device Installed on Pump Suction Line
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7810120051
Download: ML17206A475 (2)

LER-1978-034, /03L-0 on 780902:during Short Maint Shutdown, Charging Pump 1A Was Found to Have Cracked Pump Casing, Probably Due to Suction cavitation.1Apump Casing Will Be Replaced & Damping Device Installed on Pump Suction Line

Event date:
Report date:
3351978034R03 - NRC Website

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shutdown, charging pump "1A" was found to have a cracked pump casing.

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service.

The water leakage through the crack was minor and it was contained by the radioactive waste management system.

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REPORTABLE OCCURRENCE 335-78-34 LXCENSEE EVENT REPORT PAGE T["TO Additional Cause Descri tion The engineering evaluation of system operation and vibration suggests that suction cavitation, primarily due to piping configuration, may be the cause.

Although the other two pumps are much less subject to this problem due to signi-ficant differences in the suction piping configuration, we plan to install damping devices (accumulators) on the suctions 'of all three (3) charging pumps.

&le are already in 'the procurement stage of this project which will be pursued on an expedited basi's.