ML20084N853

Telecopy Ro:On 750826,isolation Condenser Pressure Switches PS3-263-53A,53B & 53C Setpoints Above Tech Spec Limit. Probably Caused by Setpoint Drift Due to Inactivity During Refuel Outage

ML20084N853
Person / Time
Site:	Dresden
Issue date:	08/28/1975
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084N845	List: ML20084N841 ML20084N853 ML20084N859 ML20084N861
References
NUDOCS 8306090094
Download: ML20084N853 (1)

Text

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1. ISOLATION CONDENSOR SUST AINED HIGH REACTOR PRESSURE SWITCHES O PS3-263-53 A,B&C TO ABOVE THE TECH. SPEC. LIMIT OF LESS THAN OR EQUAL b O TO 1070 PSIG. PS3-263-53 A WAS FO UND AT 1090 PSI; 53B AT 1087 PSI; 53C O AT ll22 PSI. SWITCHES ARE MELETRON TYPE AND DRIFT IS BELIEVED CAUSED E O sY INACTIVITY CAUSED BY CURRENT REFUEL OUIAGE. Oh

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2. ADDITIONALLY, REACTOR PRESSURE ECCS INITI ATION.p4 TTf.y(MITS OF -=

PS3-263-52A-1 AND 52N-2 WERE ALSO FOUND AB0VE TECH. SPEC' LI bokSIALkSI THAN..QR EQUAL eT0kP. LESS THAN OR EQUAL TO 350PSIG. { THE

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MELETRON SWITCHES WERE FOUND AT 365 PSI (A-1) AND 366 PSI (A-2). TH i DRIFTS ALSO ARE BELIEVED TO BE CAUSED BY INACTIVITY.

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3. MAIN STEAM LINE DRAIN ISOL AT IO N V ALVE M03-220- 1, DURING MAINTENANCE, W AS FOUND WITH A FAILED OVERLOAD RELAY WHICH CAUSED j MALOPERATION OF THE VALVE DURING TESTING. PRIMARY CONT AINMENT -{

INTEGRITY MAY H AVE BEEN AFFECTED IN THE SINGLE FAILURE MODE O-WOU O HAVE AN ISOLATION DURING OPERATION OCCURRED. ADDITIONAL INFO WILL FOLLOW IN A TEN DAY REPORT. O

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{~ h k. 7 , g' e D UNITED STATES O NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION til 799 ROOSF.VELT RO AD CLEN ELLYN, ILLINOIS 60137 A. . IE Inspection Report No. . Transmittal Date  : Distribution: Distribution: IE Chief, FS&EB IE Chief, FS&EB IE:HQ (5) IE: LIQ (4) DR Central Files L:D/D for Fuels & Materials Regulatory Standards (3) DR Central Files Licensing (13) IE Files

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IE Files IE Chief,' M&FPB L:D/D for Reactor Froject B. IE Inquiry Report No. Transmittal Date  : Distribution: Distribution: IE Chief, FS&EB IE Chief, FS&EB IE:HQ (5) IE:HQ DR Central Files DR Central Files Regulatory Standards (3) IE Files Licensing (13) ., IE Files , C. Incident Notification From: Commonwealth Edison Co. 50-249

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(Licensee & Docket No. (or License No.) Transmittal Date  : September 3. 1975 Dresden Station #3 Distribution: Distribution: ! TE Chief. FS&EB IE Chief, FS&EB IE:HQ-(4) IE:HQ (4) ' Licensing (4) L:D/D for Fuels & Materials-DR Central Files DR Central Files IE Files IE Files l l ML ,

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