ML20084R406

Telecopy Ro:On 750428,HPCI High Temp Isolation Switches Drifted During Operations,Exceeding Tech Spec Limit.Caused by Drift of 12 Sensors Found During Refueling Outage. Switches Will Be Replaced W/Capillary Type Switches

ML20084R406
Person / Time
Site:	Dresden
Issue date:	04/28/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084Q736	List: ML20084Q733 ML20084R404 ML20084R406
References
NUDOCS 8306150097
Download: ML20084R406 (2)

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PMS JAMES ~G KEPPLER fnq REGIONAL DIRECTOR g

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SUBJECT:

DPR-25, DRESDEN NUCLEAR POWER STATION, UNIT THREE. W i

THIS WILL CONFIRM A CONVERSATION VIT i MR R KNOP OF YOUR OFFICE AT @

1600 HOURS THIS DATE CONCERNING DRIFT OF HIGH PRESSURE COOLANT INJECTION SYSTEM (HPCI) HIGH TEMPERATURE ISOLATION SWITCHES DURING 3 OPERATIONS TO 202-249 DEGREES F WHICH EXCEEDS TECH SPEC LIMITS OF l

200 DEGREES F THE DRIFT OF TWELVE OF TNE SIXTEEN SENSORS WAS FOUND $

DURING REFUELING OUTAGE FUNCTIONAL SERVAILLANCE. THESE SWITCHES HAVE l BEEN A CONTINUING PROPLEN AND THE STATION EXPECTS TO REPLACE THESE T WITH A CAPILLARY TYPE SVITCH IN THE NEAR FUTURE.

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ADDITIONALLY, INSPECTION OF DRYWELL HYDROLIC PIPING RESTRAINTS l

REVEALED 2 MESTRAINTS INOPERABLE DUE TO LOSS OF HYDROLIC FLUID. ONE @

SNUBBER WAS 112 LOCATED ON 3A REACTER RECIRCULATING PUUP AND THE

' SF-1201 (R569)

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OTHER#DONTHEMAINSTEAMLINhFORTHESUPPORTOF3ATARGETROCK I RELEASE VALVE. BOTH RESTRAINTS CONTAINED ETHYLENE-PROPOLENE SEAL ( MATERIAL AND WILL BE OVERHALLED DURING THE OUTAGE. O B B STEPHENSON SUPT DHESDEN NUCLEAR POWER STATION COMMONWEALTH EDISON C0 RR ! MORRIS IL 60450 @ NNNN f S 3 ( O f

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