05000335/LER-1980-051-03, /03L-0:on 800904,during Return to Full Power Operation,Control Element Assembly 33 Dropped to Full Insertion.Caused by Blown Fuse in Alternate Parallel Supply Line.Fuse Replaced & Power Supplies Exchanged

/03L-0:on 800904,during Return to Full Power Operation,Control Element Assembly 33 Dropped to Full Insertion.Caused by Blown Fuse in Alternate Parallel Supply Line.Fuse Replaced & Power Supplies Exchanged

ML17266A280
Person / Time
Site:	Saint Lucie
Issue date:	10/03/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A227	List: 05000335/LER-1980-051, Forwards LER 80-051/03L-0 05000335/LER-1980-051-03, /03L-0:on 800904,during Return to Full Power Operation,Control Element Assembly 33 Dropped to Full Insertion.Caused by Blown Fuse in Alternate Parallel Supply Line.Fuse Replaced & Power Supplies Exchanged
References
LER-80-051-03L, LER-80-51-3L, NUDOCS 8010100345
Download: ML17266A280 (2)

LER-1980-051, /03L-0:on 800904,during Return to Full Power Operation,Control Element Assembly 33 Dropped to Full Insertion.Caused by Blown Fuse in Alternate Parallel Supply Line.Fuse Replaced & Power Supplies Exchanged

Event date:
Report date:
3351980051R03 - NRC Website

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LICENSEE EVEI'47 RET~ORT Ua S. NUCLCJaA AEGULATOAYCohhhIISSION 3

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The CEA dropped because;a fuse blew during a power supply exchange.

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The exchange of power supplies from the new type to the modified older units (see LER 80-49) was in progress when CEA 33 dropped.

During this exchange it was noticed that the power supply units were not mounted strictly in accordance with the power supply vendor's technical manual.

The existing mounting blocked some of the ventilation holes in the power supply unit thereby reducing the cooling to the unit.

Mounting of the power supplies is being modified in accordance with the vendor's technical manual using standoffs to uncover the ventilation holes,and provide more cooling.