ML20084M077

Telecopy AO 4-73-8:on 730713,grounding Transformer on Bus 4B Failed.Cause Unknown.Investigation in Progress

ML20084M077
Person / Time
Site:	Turkey Point
Issue date:	07/14/1973
From:	Schmidt A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20084M072	List: ML20084M068 ML20084M077
References
AO-4-73-8, NUDOCS 8306010247
Download: ML20084M077 (2)

Text

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229P EDT JUL 14 73 AA105 AAE148(1624)(2-098619E195)PD 0 07/14/73 1624 ICS IPMBNGZ CSP O.

3852472556 TDBN MIAMI FL 141 07'-14 0424P EST PMS DIRECTOR, REGION II, FIELD OFFICE OF THE DIRECTORATE OF REGULATOR O Y OPERATIONS, ATOMIC ENERGY Cor11SSION, DLR SUITE 818 230 PEACHTREE ST NORTHWEST O ATLANTA GA 30304 FROM FLORIDA POWER AND LIGHT COMPANY TURKEY POINT PLANT, MIAMI O FLORIDA.

FLORIDA POWER AND LIGHT COMPANY TURKEY POINT PLANT REPORTS ABNORMAL O OCCURANCE #4-73-8. AT 905 PM, JULY 13, 1973, WHILE UNIT 4 WAS OPERATING AT APPROXIMATELY 200 MWE, A 25 KVA GROUNDING TRANSFORMER O ON THE 4B 4160 VOLT BUS FAILED, REGUIRING DE-ENERGIZING THE 4B BUS. THE UNIT WAS MANUALLY SHUTDOWN IN AN ORDERLY MANNER WITH 'O NO OTHER EQUIPMENT PROBLEMS. DE-ENERGIZING THE 4B BUS PLACED y.sm ou en O THE 4B AND 4C INTAKE COOLING WATER PUMPS OUT OF SERVICE, LEAVING Q

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0 ONLY THE 4A PUMP STILL OPERABLE. THE LOSS OF TWO INTAKE COOLING O WATER PUMPS VIOLATED THE LIMITING CONDITION OF OPERATION IN SECTION 3.4.5.B2, TECHNICAL SPECIFICATIONS: COOL DOWN OF UNIT O 4 HAS BEEN INITIATED. THE CAUSE OF THE TRANSFORMER FAILURE IS NOT PRESENTLY KNOWN BUT IS STILL UNDER INVESTIGATION. O A D SCHMIDT DIRECTOR OF POWER RESOURCES f1 i 'g r.im m s ,

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JUL 171973 Telegram from Florida Power and Light Company, A. D. Schmidt, dated July 14, 1973 - 50-251 DISTRIBUTION:

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