ML17252B013

Letter Confirming a 11/20/1972 Conversation Concerning Reactors Low Pressure Switches Being Out of Calibration - Dresden Unit 3

ML17252B013
Person / Time
Site:	Dresden
Issue date:	11/20/1972
From:	Worden W Commonwealth Edison Co
To:	Giambusso A US Atomic Energy Commission (AEC)
References
Download: ML17252B013 (1)

Text

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WAE197<2043JC1~032231C325002>PD 11/20/72 2039  :~wt

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~ ..... J *N 2CZC 00222 TOVE MORRIS ILL 120 11-20 315P_CST ~i R'1S MR A GIAMBUSSO DEPUTY DIRECTOR OF REACTIV~ PROJECTS ~~

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DIRECTOR APE OF ~ICENSING WUX ~ACHINE. ~

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L6 ATOMICH ENERGY COMMISSION W\SH I NG TON DC M~~} ~ - .* '

BJEC T : .OP R. -2 5 DRESDEN NUCLEAR POWER' STAT I ON U_ N1 T 3 n1-. ,,..,,,_.

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lHIS WILL CONF !RM A CONVERSATION wi TH MR ;i DANCE OF YOUR! ~- ~/.., $.

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A~. 1100 HOURS THIS DATE C~N<;:ERNING REACT,ORS LOW PRESSURE _sw1 TC . ~ -~~;~ \ \~ '.

~ING OUT.OF ~ALIBERATION~

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ON ~l/L9/72 WHlLE UNIT i-WAS SHUT DOWN, AtAL)BERATION WAS MADE ON MAIN STEAM LINE LOW PRESSURE-SWITCHES.

CABLE 3.2.1 OF THE TECHNICAL SPE.CIFICATIONS STATE THAT THE TRIP

~VEL SETTING ON THESE SWITCHES SHOULD BE EQUAL TO OR GREATER lHAN 8 50 PS I G** ALL FOUR PRESSURE SW I TC HES HAD TR IP SETTINGS BELOW 850 PSIG. PRESSURE SWITCHES 3-261-30A AND 308 HAD SETTING

. F 847 AND 848 PSIG *. PRESSURE SWITCHES 3-261-30C *AND 300

~D.SETTINGS OF 849 AND 848 PSIG. IN ORDER TO ELIMINATE.THIS PROBLEM*

I IN THE FUTURE .THE "AS LEFT" CALIBERATION SETTING ON THESE

~ITCHES HAS BEEN CHA~GED F~OM 85~ PLUS OR Ml~US PSIG Pl,.US OR i"11NUS 4PSIG.

W P WORDEN ~UPERINTENDENT COMMONWEALTH EDISON ORESD~N ~UCLEAR POWERSTATIQN RR 1 MORRIS ILLINOIS

.I 430A 11-21-72

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