ML20084U147

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

ML20084U147
Person / Time
Site:	Dresden
Issue date:	05/08/1972
From:	Worden W COMMONWEALTH EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084U135	List: ML20084U132 ML20084U139 ML20084U144 ML20084U147 ML20084U377
References
NUDOCS 8306270072
Download: ML20084U147 (2)

Text

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\; f^ D<-icy G F:1 4 gg 352P EST MAY 8 72 DEB 623 SSE249 DE CCC094 (CH 129CC601094)PD UU JOL 0126P EDT OS/08/y v v) 2 2C2C 1 NL PD MORRIS ILL t1AY 4 415P CDT )k MR BOUCE GRIER, DIRECTOR REGION 3 COMPLIANCE h q US ATOMIC ENERGY COMM 799 ROOSEVELT RD GLEN ELLYN ILL 60137 9

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( m D P R 25 DRESDEN NUCLEAR POUER STATION UNIT 3: Nci G Q gz g $

THIS WILL CONFIRM C0tNERS ATION AT 15:00 IIRS THIS DATE WITH H DANCE W '~ U I

REGARDING F AILURE OF Tile ISOL ATION CONDENSOR V ALVE 3-1301-3 b ELECTRICALLY FOLLOUING A REACTOR SCRAM. IMMEDIATELY FOLLOWING TOOPENbf;$h

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l THE' SCRAM WHICH OCCURRED AT 0901 HRS A GROUP 1 ISOL ATION OCCURED 33[r BEC AUSE OF A IIIGH W ATER LEVEL CONDITION. dd$ k AN AT'IEMPT WAS t1ADE TO PL ACE D{E ISOL ATION CONDENSOR IN SERVICE u -

, BUT V ALVE 3-1301-3 WOULD NOT OPEN. AN OPERATOR HAD' TO GO TO DIE V ALVE g i SF-1201 (R5-69)

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B306270072 720603 i PDR ADOCK 05000249 P pgg AND M ANUALLY CRAKE THE V ALVE OFF ITS SEAT. ONCE DIE V ALVE WAS OPEt:ED ITS BREAKER RE-SET AND IT FUNCTIONED PROPERLY.

WHILE THE OPERATOR WAS WORKING ON PL ACING THE ISTL ATION CONDENSOR IN SERVICE REACTOR PRESSURE INCREASED TO APPROXIMATELY 1100 PSIG AT THIS PRESSURE 3 A ELECTROMATIC V ALVE OPENS AUTOM ATIC ALLY. ..

WHEN TIIE ELECTROMATIC VALVE OPENED THE DRYWELL PRESSURE IMMEDI ATELY I NCRE ASED TO 2. 5 PSIG. AFTER PEAKING AT 2 5 PSIG ' DIE DRYWELL PRESSURE RETURNED TO NORMAL. -

A COMPLETE DRYWELL INSPECTION WILL BE MADE WHEN ENTRY IS POSSIBLE

\ TO DETERMINE TIIE C AUSE OF THE PRESSURIZ ATION AND TO DETERMINE IF i '

ANY EQUIPMENT HAS BEEN DAMAGED AS A RESULT OF THIS PRESSURIZ ATION IN ADDITION A COMPLETE CHECK-0UT WILL BE MADE ON VALVE 3-1301-3

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C 85 20Fa51HE ISOL ATION CONDENSOR TO DETERMINE WHY IT F AILED b TO O