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: 05000249/LER-1975-024, AO 50-249/75-24:on 750426,during Routine Calibr of HPCI Area Temp Sensors,Setpoints on 12 of 16 Temp Sensors Found Above Tech Spec Limit.Caused by Unsuitable Existing Temp Sensors for First Operation Surveillance Type Operation ML20084R404 ML20084R406
References
NUDOCS 8306150097
Download: ML20084R406 (2)

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

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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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