ML17338A653

LER 79-002/03L-0 on 790310:during Cold Shutdown,Cracks Observed in 4B Charging Pump Suction Piping.Probably Caused by Design/Installation of Positive Displacement Pumps. Welds Repaired & Mods Made to Reduce Stresses

ML17338A653
Person / Time
Site:	Turkey Point
Issue date:	04/09/1979
From:	James D FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17338A649	List: ML17338A646 ML17338A653
References
LER-79-002-03L-02, LER-79-2-3L-2, NUDOCS 7904230292
Download: ML17338A653 (2)

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OIO During cold shutdown while in preparation for the Unit 3 Engineered Safeguards Test, 2 cracks were observed in the 4B charging pump suction

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The desi n installation of these ositive dis lacement umos results in.

operational pressure pulsationl vibration effects which most probably caused the cracks. Corrective action was to make a weld repair.

2 Modifications to reduce cyclic stresses have been completed on, Unit

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