ML20084T515

Telecopy Ro:On 721119,while Unit Shut Down,Calibr Made on Main Steam Line Low Pressure Switches Found Four Switches W/Trip Settings Below Tech Spec Limits.Cause Not Stated. as Left Calibr Setting on Switches Changed

ML20084T515
Person / Time
Site:	Dresden
Issue date:	11/20/1972
From:	Worden W COMMONWEALTH EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084T513	List: ML20084T512 ML20084T515 ML20084T517
References
NUDOCS 8306230239
Download: ML20084T515 (1)

Text

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VEA4 0 '( 204 5)( '-03225 ~C /20/72 2039 ICS IP!:VEIA :: Y!:

O ZCZC 00221 TDVE :: ORRIS ILL 120 * ~-(20 5 5P CST P:!S "R E0YCC CRIER DIR DIVN OF CCIIPLI ANCE REGIO!: E' UUY MACHINE ,

O US ATO:IC ENERGY COMMISSION 779 ROOSEVELT RD -

CLEN ELLYN ILL 60'57 -

O SUBJECT : OPR-25 DRESDEN NUCLEAR POUER STATION UNIT 3 THIS UILL CONFIRM A CCMVEREATION UITH MR H DANCE OF YOU1 0FFICE O

AT 1100 HOURS THIS DATE CONCERNING REACTORS LOU PREECURE SUITCHEF EEINC OUT CF CALIBERATION. ON 11/ '9/72 UHILE UNIT 3 UAS SHUT DCUN, O

A CALIDERATIO*1 UAS MADE ON MAIN STEA" lit:E LOU PRESSURE SUITCHES.

CAELE 5 2.10F THE TECHNICAL SPECIFICATIONS STATE THAT THE TRIP O

LEVEL SETTING ON THESE SUITCHES SHOULD BE Ef UAL TO OR GREATER THAN S50 PSIC. ALL FOUR PRESSURE cUITCHES HAD TRIP SETTINGS BELO" 850 PSIC. PRES 9URE SUITCHES 3-261-30 A AND 50B HAD SETTING O

OF C4' AND C!lE PSIC. PRESSQF. LS'3IYdiiES 5-261-300 AND 300 er mi tu _ . O IN THE FUTURE THE "AS LEFT" CALI3ERATION SETTING ON THESE SUITCHES HAS DEEf! CHANGED FRO : F55 PLUS OR MINUS PSIC TO C66 PLUS OR MIN'JS 4PSIC.

U P UCRDEN SUPERINTENDENT C0'!MONUEALTH EDISON DRESDEN I:UCLEAR POUERSTATION RR 1 MORTIS ILLINOIS O

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