ML20085F388

Telecopy AO AO-75-7:on 750406,plant Discharge Effluent from Mixing Basin Exceeded Tech Spec Limit.Caused by Cracking Open of Condenser Inlet Valve MOV-5301 to Reduce Hotwell Temp to Avoid Thermal Shocking Condenser Tubes

ML20085F388
Person / Time
Site:	Palisades
Issue date:	04/06/1975
From:	Dewitt R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20085F367	List: ML20085F358 ML20085F377 ML20085F388
References
AO-75-7, NUDOCS 8308220075
Download: ML20085F388 (2)

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i SUBJECT - ABNORMAL SCCURRENCE 75 VERIFICATION OF PHONE CONVERSA-TION MR XEN BAKER ON 4/6/75 AT 1930 REPORTED BY JERRY SLADE REPORT NO 75-7  !

REPORT DATE - APRIL 6, 1975 OCCURRENCE DATE - APRIL 6, 1975 FACILITY - PALISADES PLANT 4 v -A f IDENTIFICATION SF OCCURRENCE - PLANT DISCHARGE EFFLUENT HEAT RATE GREATER THAN 0.5 BILLIGN BTU /HR SF-1201 (RS-39)

DESCRIPTION OF OCCURRENCE -

ON APRIL 6,1975 FROM 0130 TO APPROXIMATELY 0500 THE PLANT DISCHARGE EFFLUENT FROM THE MIXING BASIN EXCEEDED THE 0.5 BILLION BTU /HR TECHNICAL SPECIFICATION LIMIT.

DOPY sari T0: PDR v LPDR L og ANALYSIS OF OCCURRENCE - usi c____

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Re NO 88 PRIOR TO PUTTING THE "A" COOLING TOWER IN SERVICE THE CONDENSER

$ INLET VALVE - MGV - 5301 WAS CRACKED GPEN TO REDUCE THE HeTWELL l S$ TEMPERATURE. THIS WAS BONE TO AVOID THERMAL SHOCKING THE CONDENSER TUB ES. THE WATER PASSING THRU THE CONDENSER DISCHARGED OVER THE ,

@e PUMP SUCTION BASIN INTO THE PLANT DISCHARGE EFFLUENT MIXING BASIN.  !

SStn AT THE TIME THE LAKE INLET TEMPERATURE WAS 36 DEGREES F. THE MIXING !

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BASIN OUTFALL WAS RAISED TO A MAXIMUM OF 74 DEGREES F. THIS CALCU-

! LATES TO A MAXIMUM DISCHARGE HEAT RATE OF 1.42 BTU /HR WITH AN

! ESTIMATED 75000 GALLONS PER MINUTE FLOW RATE.

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i CORRECTIVE ACTION -

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THE DISCHARGE HEAT RATE WAS REDUCED SELOW THE TECHNICAL SPECIFICATION LIMIT ONCE THE "A" COOLING TOWER WAS PLACED Ih SERVICE. THIS WAS AT ABOUT 0500 ON APRIL 6, 1975.

! PREVIOUS OCCURRENCE - ONCE - A8 75-6.

l j- R S DEWITT l PALISADES PLANT SF-1201 (R5-t9)

CONSUMERS POWER COMPANY CBW 1

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i ia APR .O i SF tN1 (RS-69)

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