ML20040C293

LER 82-001/04T-0:on 820110,during Deicing,Circulating Water Sys Discharge Temp Exceeded Tech Specs.Caused by Inability to Open Discharge Gates WMO-25A & WMO-25B Electrically.Valve Positions Changed Manually

ML20040C293
Person / Time
Site:	Cook
Issue date:	01/19/1982
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040C288	List: ML20040C287 ML20040C293
References
LER-82-001-04T, LER-82-1-4T, NUDOCS 8201270494
Download: ML20040C293 (2)

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1 'l 61 68 63 EVENT DATE 74 75 DATE 80 DOCKET NUMBER WEN F DESCRIPTION AND PROB ABLE CONSEQUENCES h 10121 l,DURING DEICING, WHICH BEGAN ON JANUARY 8,1982, AND CONTINUING UNTIL JANUARY 11, 1982,1 ioi3i lTHE CIRCULATING WATER SYSTEM DISCHARGE TEMPERATURE EXCEEDED THE TECHNICAL SPECIFICA- l 0

l014l l TION, APPENDIX B, SECTION 2.1.1.2.2 LIMIT OF 56 F ON SEVERAL OCCASIONS. I loisil l IO lc 1 l l 1011] I l 101811 1 80 1 8 9 DE CODE S BC E COMPONENT CODE SUBC DE SU C2 IOlol l ill Fl@ [Ej@ W@ l VI Al Ll VI 0l Pl@ [XJ@ l Z i@

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h IiloIlTHE CAUSE OF THIS EVENT WAS DUE TO THE COMBINATION OF THE SHORT TIME PERIOD THAT IT l I

1i ii l l TOOK FOR THE SURROUNDING SURFACE AREA TO BECOME ICE C0VERED AND THE INABILITY T0 i,,7i l ELECTRICALLY OPEN THE DISCHARGE GATES WM0-25A AND 25B AND CLOSE THE DEICING DISCHARGE l

[ii,i l GATE WM0-26. MANUAL MEANS WERE USED TO CHANGE THE VALVE POSITIONS TO THE NORMAL MODE l g l(SEE ATTACHED SUPPLEMENT). I

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• a SUPPLEMENT TO AE0 #82-001/04T-0 CAUSE DESCRIPTION AS A RESULT OF LAKE MICHIGAN WATER TEMPERATURE DROPPING TO 33 F THE CIRCULATING WATER SYSTEM WAS CHANGED FROM THE NORMAL UNIT 2 DISCHARGE TO DEICING CONDITIONS ON JANUARY 8, 1982. DURING DEICING, THE HEATED DISCHARGE WATER IS DIRECTED THROUGH ONE OF THREE INTAKE PIPES WHERE IT DISCHARGES IMMEDIATELY ADJACENT TO THE OTHER TWO INTAKE STRUCTURES.

THIS IS DONE TO KEEP ICE FROM FORMING ON THE INTAKE STRUCTURES AND TRAVELING SCREENS BY INCREASING THE INTAKE WATER TEMPERATURE.

ON JANUARY 10, 1982, WHILE OPERATING AT A STEADY STATE IT WAS NOTICED THAT BOTH THE INTAKE TEMPERATURE AND THE DISCHARGE TEMPERATURE OF THE CIRCULATING WATER SYSTEM WERE INCREASING. DURINGTHigTIMEPERIODTHE CONDENSER AT REMAINED WITHIN THE REQUIRED LIMIT OF 18 F. THE TEMPER-ATURES INCREASED RAPIDLY DUE TO THE SEVERE WEATHER CONDITIONS WHICH CAUSED THE SURFACE AREA AROUND THE INTAKES TO BECOME ICE C0VERED. NORMAL LAKE CURRENTS WERE NOT AVAILABLE TO ALLOW THE WARM DISCHARGE WATER TO MIX WITH THE COLDER LAKE WATER.

PRIOR TO EXCEEDING THE DISCHARGE TEMPERATURE LIMIT OF 56 F IMMEDIATE ATTEMPTS WERE MADE TO RETURN TO THE NORMAL DISCHARGE CONFIGURATION. IT WAS DIS-COVERED THAT THE VALVE OPERATORS WERE FR0 ZEN AND WOULD NOT FUNCTION ELECTRICALLY.

INABILITYTOQUICKLYOPENTHEDISCHARGEGATESANDCL0gETHEDEICINGGATES CAUSED THE DISCHARGE TEMPERATURE TO INCREASE AB0VE 56 F. TEMPERATURESWgRE REDUCED BELOW 56 F BY POWER REDUCTION. A MAXIMUM PEAK TEMPERATURE OF 59 F WAS ACHIEVED DURING ONE OF THESE FLUCTUATIONS.

THE VALVE OPERATORS HAVE BEEN TEMPORARILY HEAT TRACED. THE COMBINATIONS OF LOW AIR TEMPERATURE AND HIGH WIND VELOCITY WERE THE WORST CONDITIONS EXPERIENCED SINCE THE SYSTEM UAS PLACED IN SERVICE IN 1975.