ML20084U377

Telecopy Ro:On 720508,following Reactor Scram Isolation Condenser Valve 3-1301-3 Failed to Open Electrically.Cause Not Stated.Valve Manually Opened.Breaker Reset & Tested Satisfactorily

ML20084U377
Person / Time
Site:	Dresden
Issue date:	05/08/1972
From:	Worden W COMMONWEALTH EDISON CO.
To:	Grier B US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084U135	List: ML20084U132 ML20084U139 ML20084U144 ML20084U147 ML20084U377
References
NUDOCS 8306280652
Download: ML20084U377 (2)

Text

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1LAA117 PA160 0 NNH096 (CH IE9',,53BB96)PD WU JOL el30P EDTPS/08/TP ZCZC 2 NL.PDF HORRIS ILL 4 AISP COT DR PETER A MORRIS, DIREC10R DIVN OP REACTOR LICENSING ,

US ATOMIC ENERGY COMMISSN WASH 00 2054b BT D P R 25 DRESDEN NUCLEAR POWER STA110N UNIT 3 THIS WILL CONFlRM CONVERSA1!ON Al 15:00 HRS THIS DATE WITH H DANCE REGARDING FAILURE OF 7tjE ISOLA 11bN"CONDENSOR VALVE 3 1301-3 TO OPEN .

ELECTRICALLY FOLLOWING A REAC10R SCRAM. IMMEO!ATELY FOLLOWING THE SCRAM WHICH OCCURRED AT 0901 HRS A GROUP 1 ISOLA 110N OCCURED

$ECAUSE OF A HIGH WATER LEVEL CONDITION.

AN ATIEtiP1 WAS MADE TO PLACE THE ISOLATION CONDENSOR IN SERV!CE BUT VALVE 3 13pl-3 WOULD NOT OPEN. AN OPERATOR AD TO 00 10 1HE VALVE i AND MANUALLY CRAKE THE9 VALVE OFF 11S SEAT. ONCE THE VALVE WAS l .

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. 0PENED 11S BREAKER RE-SE1 AND IT FUNCTIONED PROPERLY.

WHILE THE OPERATOR WAS WORKING ON PLACING THE ISOLATION CONDENSOR IN SERVICE REACTOR PRESSURE INCREASE 0 TO APPROXIMATELY 1100 PSIG AT THIS PRESSURE 3A ELECTROMATIC VALVE OPENS AUTOMATICALLY.

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8306280652 720603 -

PDR ADOCK 05000249 P PDR

WHEN THE ELECTROMA11C VALVE OPENED THE DRYWELL PRESSURE IMME'DIA1ELY INCREASED TO 8 5 PSIG. AFTER !EAK!NG AT 0.b( .

PSIG THE FRYWELL s

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VRESSURE RtibkNEF TO NORMAL _,,

A COHPLelE DRYWELL IN PEC110N WILL BE MADE WHEN ENTRY LS POSS!ULE TO DETERMINE THE CAUSE OF THE PRESSURIZATION AND _ TO DETERMINE IF

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ANY EQUIPMENT HAS BEEN EAMAGED AS A RESULI. 0F THIS PRESSURIZ$ TION IN ADD 1110N A COMPLETE CHECK-0UT WILL E8E MADE ON VALVE 3*13Rl*'3 0F THE ISOLATION'00NDENSOR TO DETERMINE WHY IT FAILED TO OPEN W P WONDEN PLANT SUPERINTENDENT DRESDEN' NUCLEAR PDWFR ST ATION

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D P R 25 3 15:00 3-1301-3 0901 3 1301-3 1100 PSIG 3A P.5 P.5 3-1301 3 .

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