ML17238A730

Regarding Failure of the Isolation Condensor Valve 3-1301-3 to Open Electrically Following a Reactor Scram

ML17238A730
Person / Time
Site:	Dresden
Issue date:	05/08/1972
From:	Worden W Commonwealth Edison Co
To:	Morris P US Atomic Energy Commission (AEC)
References
Download: ML17238A730 (3)

Text

• E~TtRN UNION U~GUMING **

+

• \\912 MAY 8 PM 3 47*,*...

USAEC HQS GTWN WU WSH.t TLXA117 PA160 Q NNH096 <CH 1,29*;,530096>PD WU JOL

• 0J 30P ZCZC 2 NL\\PDF MORRIS ILL 4 415P CDT DR PETER A MORRIS,.DIRECTOR DIVN OF 'REACTOR LICENSING

___:_~----:"""~------*

• -,..---~~~'

US ATOMIC E~ERGY COMMISS~ WASHDC 20545 BT DP R 25 DRESDEN:NUCLEAR POWER STATION UNIT 3:

THIS WILL CON~l~M CO~VERSATIO~ AT 15:00 HRS THIS DATE WITH H

\\.

I REGARDING FAILURE OF THE ISOLATIO~ CONDENSQR VALVE 3~1301-3 io OPEN ELECTRIC~LLY FOLLOWING ~ ~EACTOR StRAM*. IMMEDfATELY FOLLO~IN~

THE SCRAM WHICH OCCURRED AT 090*1 HRS A GROUP 1 ISOLATION OCCURED BECAUSE OF A HIGH _WATER LEVEL CONDITION.

AN ATTEMPT WAS MADE TO PLACE THE ISOLATION CONDENSOR 1N SERVICE BUT VALVE 3-1301-3 WOULD NOT OPEN. AN OPERATOR AD TO GO TO THE VALVE I

-~~1*

AND MANUALL~ CRAKE THE VALVE OFF ITS SEAT. ONCE THE VALVE WAS 2~16*

~a5fi I

\\

• OPENED ITS BREAKER RE-SET AND Ir FUNCTIONED PROPERLY*

~---..

l*

I WHILE THE OPERATOR ~AS WORKING ON PLACING THE

~SOLA~ION CONDENSOR IN SERVICE REACTOR PRESSURE INCREASED TO APPROXIMATELY I

1100 PSIG AT THIS PRESSURE 3A ELECTROMATIC VALVE OPENS AUT0M~1lCALLY.

'WHE,N THE ELECTROMAT IC VALVE OPENED THE DRY WELL PRE*SSURE I MME DI ATE LY INCREASED TO 2.s PSI~* AFTER,IEAKING AJ 2.sc PSIG THE FRYWELL PRESSURE RETURNEF TO NORMAL.

I A COMPLETE DRYWELL IN PECTION WILL SE MADE WHEN ENTRY IS POSSIBLE TO DETERMINE THE CAUSE.OF THE PR~SSUR1~ATf ON AND' TO DElERMINE IF ANY EQUIPMENT HAS BEEN DAMAGED AS A RESULf OF THIS PRESSURIZ~tION IN ADDITION A COMPLETE CHECK-OUT WILL EBE MADE ON

~ALVE 3-1301*3 OF THE ISO~ATibN'CONDENSOR TO DETERMINE WHY IT FAILED TO OPEN W P WORDEN PLANT SUPERINTENDENT DRESDEN NUCLEAR PbWER STATION

~*

• --"4\\..

• 1 1_

~'

_).,. -'

/

DP R 25 3 15:00 3-.1301-3 0901 3-1.301-3 1100 PSIG 3A 2.5 2.5 3-1 301 -3 NNNNC0133P EDT>

/

' '