ML20084L845

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

ML20084L845
Person / Time
Site:	Dresden
Issue date:	06/12/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084L843	List: ML20084L840 ML20084L845 ML20084L849
References
NUDOCS 8305240024
Download: ML20084L845 (1)

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SUdJECT: OPR-11 DHESDEN NUCLEAR POWEH STATION 091T 2.

Th!S WILL CONFIRM A CONVERSATION WITH F. MAURA 0F YOUR OFFICE AT 1330 HOURS TH1S DATE CONCERNING DRIFT OF HEACTOR PROTECT 109 HibH PHESSURE SWITCH Two 1066 PSI WHICH IS IN EXCESS OF TECHNICAL SP EC IF IC A T I ON LIMITS Cr 106C AND THF nRivT OF ISOLATICN C090ENSEH ISCLATION INITI ATING Sw! TCn Two 1075 ddICH IS IN '

EXC ESS OF liCHNICAL SPECIFICATION LIMIT OF 1070 PSI. BOTH SW I TCH UNIFT PH0cLEAS WERE DISCOVe'He.O DUPING ROUTINE SURVE! LANCE AND WEHE IMMEulATELY HESET TO idEIH PROPER V ALUES REAC TOR WAS SHUT DOWN AT THE TIME. SalTCHES *ERe. NOT P R EC O,401110 N E D s

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