ML20084L849

Telecopy Ro:On 740612,during Routine Surveillance,Reactor Protection High Pressure Switch & Isolation Condenser Initiating Switch Drifted High.Caused by Lack of Preconditioning.Switches Reset

ML20084L849
Person / Time
Site:	Dresden
Issue date:	06/12/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084L843	List: ML20084L840 ML20084L845 ML20084L849
References
NUDOCS 8305240030
Download: ML20084L849 (2)

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VEC226(1649)(l-036772Cl63)PD 06/12/74 164gMJW l2 I"! 3: 52 IC9 IPMVEIB MVN q , ggg 4

02105,TDVE MORRIS ILL 104 06-12 210P CDT PMS MR JAMES G KEPPLER -- REGIONAL DIRECTOR DIRECTORATE OF REGULATORY l OPERATIONS REGION E US ATOMIC ENGERY COM 799 ROOSEVELT RD WUX g

, ' GLEN ELLYN ILL 60137 se SU3 JECT: DPR-19 DRESDEN NUCLEAR POWER STATION UNIf 2.

, h$ THIS WILL CONFIRM A CONVERSATION WITH F. MAURA 0F ,'f00R OFFICE AT , [. ^

'@8 1530 HOURS 'THIS DATE CONCERNING 1) RIFT OF REACTOR PROTECTION HIGH RRESSURE SWITCH TWO 1066 PSI WHICH IS IN EXCESS OF TECHNICAL i'85 ' SPECIFICATION LIMITS OF 1360 AND THE DRIFT OF ISOLATION CONDENSER ISOLATION INITIATING SWITCH TWO 1075 WHICH IS IN /

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8x QUESS OF TECHNICAL SPECIFICATION LIMITS OF'1070 PSI. BOTH c OSm ShsTC21 DRIFT PROBdEMS WERE DISCOVERED DURING ROUTINE l#,t/b I I SUR EIL ANCE _4N9 W'ERE IMMEDI ATELY RESET TO THEIR PHOPER VALUES. h '

REAbiOR WAS St{bT DOWN AT THE TIPE. SWITCHES WERE NOT PRECONDITIONED

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