05000335/LER-1980-046-03, While at 100% Power, Control Element Assembly 33 Dropped to Fully Inserted Position.Caused by Failed 15-volt Dc Power Supply in Coil Power Programmer.Power Supply Replaced

While at 100% Power, Control Element Assembly 33 Dropped to Fully Inserted Position.Caused by Failed 15-volt Dc Power Supply in Coil Power Programmer.Power Supply Replaced

ML17266A366
Person / Time
Site:	Saint Lucie
Issue date:	11/19/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A393	List: 05000335/LER-1980-046, Forwards Updated LER 80-046/03L-1 05000335/LER-1980-046-03, While at 100% Power, Control Element Assembly 33 Dropped to Fully Inserted Position.Caused by Failed 15-volt Dc Power Supply in Coil Power Programmer.Power Supply Replaced
References
LER-80-046-03L, LER-80-46-3L, NUDOCS 8012020542
Download: ML17266A366 (2)

LER-1980-046, While at 100% Power, Control Element Assembly 33 Dropped to Fully Inserted Position.Caused by Failed 15-volt Dc Power Supply in Coil Power Programmer.Power Supply Replaced

Event date:
Report date:
3351980046R03 - NRC Website

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UPDATE REPORT - PREYIOUS REPORT DATE SEPTEMBER 25, 1980 NRC FORSt SCS 37.773 LICEi4SEE EVE!v7 REPORT Uof NUCLEAR RECIJLATORY COMMISSION

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@%PORTO* ~ 5 30 EVENT OESCRIFTION 'NO PROBABLE CO'JSECUfNCES QIQ Mhi.le at 100%

ower CEA /f33 dro ed to its full inserted osition

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Actin was in iated er T.S..1.3.1e.

Power was reduced to 70%

the CEDN drive. control for CEA II33 was repaired.,

and CEA 833 was re-aligned 0

5 This is the 11th occurrence of a dro 37ed

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CEA due to a failed ower su 1

(LER's 335-76-37,79-6,80-2,23,34,35,36,

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42,43,45).

Of these 11, 8 were due to the failure of new power supplies

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(Powermate UNI-30 ABV) installed during the ispring '80 refueling outage.

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Ower su ol in its coil ower ro rammer.

The power supply was replaced.

The power supplies for all 61 FLCEA's have since been replaced with the original type supplies (powermate UNX-88).

There have been no power-supply failures in the 73 da s since this re lacement.

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