ML17252A984

Letter Confirming a 04/23/1973 Conversation Concerning a Loss of Secondary Containment Integrity for Approximately 6 Hours on 04/19/1973 - Dresden Unit 3

ML17252A984
Person / Time
Site:	Dresden
Issue date:	04/23/1973
From:	Worden W Commonwealth Edison Co
To:	Giambusso A US Atomic Energy Commission (AEC)
References
Download: ML17252A984 (1)

Text

R B 50-249 TWX 90f USAEC HQS GTWN WU WSH TLXA195 WAD159C171~)(1-023762Cll3)PD 04/23/73 1711

!CS IPMVEIA MVN 01185 tDVE MORRIS ILL 161. 04-23 344P CST PMS MR A GIAMBUSSO, DEPUTY DIRECTOR FOR REACTOR PROJECT DIRECTORATE OF LICENSING ,U S ATOMIC ENERGY COMMISSION.

WUX-WASH DC 20545 .

SUBJECT DPR-25 DRESDEN NUCLEAR POW~R STATION UNIT 3.

THIS WILL CONFIRM A CONVERSATJO~ WITH MR HUGH DANCE OF YODR OFFICE AT 1300 ~OURS THIS DATE CONCERNI~G A LOSS OF SECONDARY CONTAINMENT INTEGRITY FOR A PERIOD OF APPROXIMATELY 6 HOURS~

ON APRIL 19, 1973 AT APPROXIMATELY 1600 HOURS UNir 3' MAIN STEAM ISOLATION VALVE CMS IV) 3-203-28 W,AS OPE NED FOR INSPECT I ON OF VAL VE /

I NT ER NA L_S

• S I NCE T HE UNI T 3 TUR i;H NE .ST,0 PP ED VAL \JES t*J ERE AL S 0 -

DISASSEMBLED AT THE TIME, A FLOW PASS EXISTED FROM THE TURBINE BUILDING tHROUGH STEAM LINES 3-30018-24 INCH AND THE DISA~SEMBLED 28 MSIV, INTO THE UNIT 3 MAIN'STEAM LINE TUNNEL WHICH IS A PART OF THE

~~CONDARY CONTAINMENT. . .

THIS CONDITION EXISTED UNTIL APPROXIMATELY 2200 HOURS ON APRIL 19, 19 73 WHEN A BLIND FLANGE WAS INSTALLED ON 28 MSIV RESTORfNG SECONDARY .

CONTAINMENT INTEGRITY. A MAINTANENCE PROCEDURE CHANGE WILL BE ISSUE TO PREVENT THIS TYPE OF INCIDENT FROM REOCCUR'*! NG W P WORDEN SUPERINTE~DENT DRESDEN NUCLEA POWER STATION COMMONWEALTH EDISON COMPANY ROUTE 1 MORRIS ILLINOIS 632P 04-3-73 2671-USAEC. HQS GTWN