ML20084M275

Telecopy AOs 3-73-2 & 3:on 730309 & 10,component Cooling Water Pump 3A & Diesel Generator Failed to Start, Respectively.Caused by Welded Contacts & Malfunctioning Solenoid Valve

ML20084M275
Person / Time
Site:	Turkey Point
Issue date:	03/15/1973
From:	Schmidt A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20084M254	List: ML20084M251 ML20084M255 ML20084M263 ML20084M275
References
AO-3-73-2, AO-3-73-3, NUDOCS 8306020075
Download: ML20084M275 (2)

Text

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O 538P EST MAR 15 73 AA201 AAD405(1650)(2-172427E074)PD

'03/15/73 1649 g ICS IPMBNGZ CSP ZCZC 3142918000 TDBN MIAMI FL 03-15 0449P EST 3 PMS US ATOMIC ENERGY COMMISSION, DLR SUITE 218 233 PEACHTREE ST NW 3 ATLANTA G A "

FLORIDA POWER AND LIGHT COMPANY TURKEY POINT REPORTS ABNORMAL g OCCURANCES NU"BER 3-73-2 AND 3-73-3.

DURING PERFORMANCE OF FUNCTION AL TESTING OF THE INTERGRATED 0 l LNIT 3 AND 4 SAFEGUARDS SYSTEMS, WITH UNIT 3 IN COLD SHUTDOWN _ _ _ __

AND UNIT 4 WITH NO FUEL IN THE REACTOR, THE FOLLOWING OCCURRED: g 3-75-2: AT APPROXIMATELY 9PM MARCH 9 1975 A TEST WAS CONDUCTED WITH INITIAL CONDITIONS OF THE B DIESEL GENERATOR DISABLED AND s 3

1HE 4B 125 BDC LOAD CENTER DENERGIZED. A SIMULATED SAFETY INJECTION SIGNAL WAS IMPOSED ON UNIT 4, FOLLOWED IN ABOUT THREE SECONDS r.imi ew, d.

BY MANUAL INTERRUPTION OF ALL OFF SITE POWER TO BOTH UNITS. _

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J THE ELECTRICAL AND SAFEGUARDS SYSTEMS FUNCTIONED AS EXPECTED WITH THE A DIESEL GENERATOR FURNISHING EMERGENCY POWER AND SEQUENCING ALL SAFEGUARDS LOADS ON THE A TRAIN OF UNIT 4. ON UNIT 3, THE 3A COMPONENT COOLING WATER PUMP FAILED TO START AUTOMATICALLY. )

M.L OTHER UNIT 3 EQUIPMENT FUNCTIONED AS EXPECTED FOR THE NON-ACCIDEN T UNIT. INVESTIGATION REVEALED CONTACTS IN THE BREAKER CLOSING -

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E E 3 T CIRCUIT WELDED CLOSED. THE CONTACTS WERE REPLACED AND FURTHER

$ TESTING OF THE BREAKER CLOSING CIRCUIT DID NOT DISCLOSE ANY _

k ADDITIONAL PROBLEMS.

5-73-2: AT APPROXIMATELY 3AM MARCH 10 1973 THE ABOVE TEST WAS REPEATED WITH THE 3A COMPONENT COOLING WATER PUMP OPERABLE. '

I DURING THIS TEST THE A DIESEL GENERATOR FAILED TO START, RESULTING

_ IN TOTAL LOSS OF AC POWER (EXCEPT FOR INVERTER FED INSTRUMENT

AC ) TO BOTH UNITS. OFFSIGHT POWER WAS RESTORED MANUALLY AND E

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[- INVESTIGATION REVEALED THAT THE A DIESEL GENERATOR AIR STATE _

SOLEN 0ID VALVE HAD FAILED TO OPEN. THE SOLEN 0ID VALVE WAS REPLACED AND THE ENGINE TESTED SATI5FACTORILY. THIS PART OF THE INTEGRATED

> SAFEGUARDS TEST WAS THEN REPEATED WITH SATISFACTORY RESULTS.

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THERE WERE NO NUCLEAR SAFETY HAZARDS INVOLVED IN THESE OCCURANCES BECAUSE THE PLANT WAS IN A SAFE CONDITION TO ACCOMMODATE THIS TESTING . j

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J A D SCHMIDT DIRECTOR OF POWER RESOURCES FLORIDA POWER AND .

LIGHT CO ADS TURKEY POINT FL J

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