ML20085J887

Telecopy Ro:On 740524,during Routine Quarterly Calibr Checks,Switch Lits 3-263-72A Found W/Setpoint Above Tech Spec Limit.Caused by Setpoint Drift.Switch Reset

ML20085J887
Person / Time
Site:	Dresden
Issue date:	05/24/1974
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085J883	List: ML20085J880 ML20085J887 ML20085J889
References
NUDOCS 8310190158
Download: ML20085J887 (2)

Text

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VEA317(1917)(1-044095Cl44)PD 05/24/74 1915 r, . 'M ICS IPMVEIB MVN -

v ' , 1 .d 02254 TDVE MORRIS IL 124 05-24 20!P CDT ,g./-

PMS MR JAMES G KEPPLER gg m t '40 t 1 REGIONAL DIRECIOR Is PHYSICAL TELEGRAMS DEllyL,3 .eg (OTHER THAN MONEY ORDERS )' '

% te . // YE4- A; ENT, NO-ADDRESSEE. 4

, DIRECTORATE OF REGULATORY g}f50W9fEGION 3 WUK ...L. ., xvran l

oo US ATOMIC ENEGRY COMMISSIO:tato diehrj[u 799 ROOSEVELT RD I l* " '-

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l o GLEN ELLYN IL 60137 . . . _ . . . . . . . . _

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% SbbJECT DPR-25 DRESDEN NUCLEAR POWER STATION UdIT THREE. l

, OO THIS WILL CONFIRM A CONVERSATION WIIH F MAURA 0F YOUR OFFICE L AT 1545 HOURST THIS DATE CONCERNING THE DISCOVERY DURING

, $2tn ROUTINE QUARTERLY CALIBRATION CKECKS OF A SET POINT DRIFT l OF L.I.T.n. 3-263-72A BEYOND THE PERMISSABLE VALVE GIVEN I IN TABLE 3,2.2 0F THE TECHNICAL SPECIFICATION. THIS SWITCH WHICH 9F.1201 (RS-49 d ,

IS THE S0 CALLED 2/3 CORE COVERAGE INTERLOCKS FOR CONTAINMENT COOLING mu*

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, Was FOUjO TO OPERATE AT 259 INCHES OF. WATER DECREASING WHICH IS AB0VE i

THE PREMISSABLE SET POINT OF 257 INCHES OF WATER DECREASING. THE SWITCH WAS RESET TO OPERAIE AT 254.5 INCHES OF WATER. ADDITIONAL DETAILS WILL BE FORTHCOMING IN THE FORM OF A TEN DAY LETTER IN ACCOR-DANCE' WITH SECTIONS 6.6.13.1.A 0F THE TECHNICAL SPECIFICATIONS.

BB STEPHENSON SUPERINTENDENT DRESDEN NUCLEAR POWER STATION COMMONWELATH EDISON C0 ,

RR 1 MORRIS IL 60450 NNNN MAY 30 :9x r i

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[,.R O UNITED STATES O ' "

I . e . I ATOMIC ENERGY COMMISSION

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' DIRECTORATE OF REGULATORY OPERATIONS REGION lli o##

4Fi t 08 "f 799 ROOSEVELT ROAD g GLEN ELLYN. ILLINOIS 60137 (312) ess-2660 A. RO Inspection Report No.

Transmittal Date  :

Distribution: Distribution:

R0 Chief, FS&EB R0 Chief, FS&EB RO:HQ (5) RO:HQ (4)

DR Central Files L:D/D for Fuels & Materials Regulatory Standards (3) DR Central Files Licensing (13) RO Files R0 Files B. RO Inquiry Report No.

Transmittal Date  :

Distribution: Distribution:

R0 Chief, FS&EB R0 Chief, FS&EB RO:HQ (5) RO:HQ DR Central Files DR Central Files Regulatory Standards (3) R0 Files Licensing (13)

RO Files C. Incident Notification From: Cornonwealth Edison Co. Docket No. 50-249 (Licensee & Docket No. (or License No.)

Transmittal Date  : July 5, 1974 Distribution: Distribution:

R0 Chief. FS&EB R0 Chief, FS&EB RO:HQ (4) RO:HQ (4)

Licensing (4) L:D/D for Fuels & Materials DR Central Files DR Central Files RO Files R0 Files U

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