05000335/LER-1979-019-03, /03L-0 on 790605:control Element Assembly Dropped Four Times within 2-h Period.Caused by Failure of Coil Power Programmer Timing Module.Module Replaced

/03L-0 on 790605:control Element Assembly Dropped Four Times within 2-h Period.Caused by Failure of Coil Power Programmer Timing Module.Module Replaced

ML17266A083
Person / Time
Site:	Saint Lucie
Issue date:	07/03/1979
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A897	List: 05000335/LER-1979-019, Forwards LER 79-019/03L-0 05000335/LER-1979-019-03, /03L-0 on 790605:control Element Assembly Dropped Four Times within 2-h Period.Caused by Failure of Coil Power Programmer Timing Module.Module Replaced
References
LER-79-019-03L-01, LER-79-19-3L-1, NUDOCS 7907120641
Download: ML17266A083 (3)

LER-1979-019, /03L-0 on 790605:control Element Assembly Dropped Four Times within 2-h Period.Caused by Failure of Coil Power Programmer Timing Module.Module Replaced

Event date:
Report date:
3351979019R03 - NRC Website

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e CEA 419 dro ed four times within a two hour period.

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After the fourth drop the coil power programmer timing module was'replaced and CEA il19 was returned to its normal position within the time l.imit speci-

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CEA 819 dro ped due to a failure of the coil ower ro rammer timin module.

No cause or failure mode has been determined.

The timer module was replaced and CEA 819 performed normally.

No other corrective action is required.

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REPORTABLE OCCURRENCE 335-79-19 LICENSEE EVENT REPORT PAGE 2

ADDITIONAL EYENT DESCRIPTION The coil power programmer timer module was replaced after CEA >19 dropped for the fourth time within a two hour period.

CEA 819 was returned to its normal position and has performed normally for 3 weeks.

Since the reactor was at zero power (Mode 2) at the time of this occur-

rence, Technical Specification 3.2 was not applicable, and no power distribution limits were exceeded.

This was the second occurrence for CEA n19.

Ho cause was determined for the first occurrence reported by LER 335-78-18.

No other dropped CEA's have been specifically attributed to a timer module failure, however, two other occurrences were corrected by replacing components including the timer module.

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