ML20084N516

Telecopy AO 3-72-8:on 821216,small Fire Occurred Due to Battery Charger Input Transformer 3 Overheating.Possibly Caused by Transformers Operating at Higher than Normal Temps.Investigation in Progress

ML20084N516
Person / Time
Site:	Turkey Point
Issue date:	12/16/1972
From:	Schmidt A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20084M560	List: ML20084M589 ML20084M631 ML20084N516
References
AO-3-72-8, NUDOCS 8306030358
Download: ML20084N516 (1)

Text

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PLANT MI AMI FL FLORIDA POWER AND LIGHT COMPANY TURXEY POINT REPORTS ABNORMAL OCCURENCE #3-72-8 AT 757 AM, DEC 15, 1972, WHILE AT COLD SHUTDOWN, THE #3 BATTERY CHARGERINPUTTRANSFORMEROVERHEATEDANDASMALLFIREOCCURED IN THE TRANSFORMER WINDING INSULATION APPARENTLY AS A RESULT, , Af/: "

0F A SHORT CIRCU;T IN WINDING. THE #3 BATTERY CHARGER WAS ISOLATED, 3 THE FIRE EXTINGUISHED AND THE #3S BATTERY CHARGER WAS PLACED t

IN SERVICE.

THERE WERE NO SAFETY IMPLICATIONS UNDER THE CIRCUMSTANCES OF THIS OCCURENCE IN THAT THE r 1RE, WHICH W AS READILY EXTINGUISHED, WAS LIMITED TO THE IMMEDI ATE AREA 0F THE TRANSFORMER INSULATION AND THE REDUNDANT BATTERY CHARGER WAS OPERABLE. C.

HOWEVER, THERE ARE INDICATIONS THAT THE #3S AND #4 BATTERY CHARGER IMPUT TRANSFORMERS ARE OPERATING AT HIGHER THAN NORMAL TEMPERATURES WHICH IMPLIES THE PROBLEM MAY BE GENERIC IN N ATURE.

A THOROUGH INVESTIGATION IS IN PROGRESS -

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