05000237/LER-1979-041-03, /03L-0 on 790606:2B Recirculation Motor Generator Set Field Circuit Breaker Tripped Open.Caused by Failure of Potential Transformer in Voltage Regulator Circuit. Transformer Replaced

/03L-0 on 790606:2B Recirculation Motor Generator Set Field Circuit Breaker Tripped Open.Caused by Failure of Potential Transformer in Voltage Regulator Circuit. Transformer Replaced

ML19270G986
Person / Time
Site:	Dresden
Issue date:	06/15/1979
From:	Dunbar J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A926	List: 05000237/LER-1979-041, Forwards LER 79-041/03L-0 05000237/LER-1979-041-03, /03L-0 on 790606:2B Recirculation Motor Generator Set Field Circuit Breaker Tripped Open.Caused by Failure of Potential Transformer in Voltage Regulator Circuit. Transformer Replaced
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7906220291
Download: ML19270G986 (1)

LER-1979-041, /03L-0 on 790606:2B Recirculation Motor Generator Set Field Circuit Breaker Tripped Open.Caused by Failure of Potential Transformer in Voltage Regulator Circuit. Transformer Replaced

Event date:
Report date:
2371979041R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK:

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d 60 61 DOCKET NuveEn G3 G9 Ev tint CATC 74 75 REPORT DATE a0 EVENT CESCRIPTION AND PROGABLE CCNSEQUENCES h o I y 1 l During normal unit operation the 2B recire MG set field circuit breaker tripped open.

l l In accordance with Tech Spec 3.6.H4 the speed of the remaining recire pu=p was l

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[ immediately reduced to less than 65%. This event has minimal safety significance l

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1since the 2A recire pump rem ined operating. No previous occurrences of this nature ois o is i L ave been reported.

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3 ICause was the field circuit breaker tricoinz open due to failure of notential I

itram former in voltate reau'lator circuit.

Faulty transfor er was reolaced and the I

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i 12 l pumo restarted satisfactorily. No additional corrective -action necessary due to I

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