ML20084R404

Telecopy Ro:On 750429,HPCI High Temp Isolation Switches Drifted During Operations Exceeding Tech Spec Limit.Caused by Drift of 12 Sensors Found During Refueling Outage.Sensors Will Be Replaced W/Capillary Type Switches

ML20084R404
Person / Time
Site:	Dresden
Issue date:	04/29/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Oleary J Office of Nuclear Reactor Regulation
Shared Package
ML20084Q736	List: ML20084Q733 ML20084R404 ML20084R406
References
NUDOCS 8306150096
Download: ML20084R404 (1)

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THI6 dill Gui.FI.v. a vui.n.noaTivi. wiin et u ni.vP or i u un o r r A c t. ai 1600 HOURS THIS DATE C0aCER AI;.6 DRIFT GF HIGH PRESSURE COOLANT INJ ECTIO;J SYSTid GiPCI ) HIGH TEc.PERaTURE ISOLATION SWITCHES DURIUG OPEdaTIQUS TO 202-243 DEddiid F WHICH EXCEEDS TECH SPEC LIMITS OF

• 2 00 DECREES F THE DRIFT OF TJELVE OF THE 6IXTEEN SEUSORS WAS FOUdD D URIHG HEFUELIdd OUTAGE FJ..CII0dAL SERVAILLauCE. THESE 6 WITCHES HAVE DEEN A CG.iTI JUI dd PdO?Lici a ud THE STATIOC EXPECTS T0 hEPLACE THESE WITH A CAPILLARY TYPE SJIiCH IG THE JEAR FUTURE.

ADDITIONALLY , I NS?ECTI0a 0F DRY DELL HYDROLIC PIPI UG RESTdAI UTS REVEALED 2 RESTR AI NTS I J0PER AdLE DUE TO LOSS OF HYDdCLIC FLUID. ONE S dU3d Ed das !!2 LOCATEJ 03 3h dEaCTER RECIRCULATING FUMP AND THE O TnER s'd ON ThE AAl d STEAaLI.iE F0.1 THE SUPPORT OF 3A TARGET ROCK RELEASE VALVE . 50TH R ESTR AI WI6 C0;iTAI NIO ETHYLEi;E-PROPCLEUE SEAL daTERI AL A UD JILL BE OVERHALLEO DURidu InE OUTAGE.

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