ML17252B019

Letter Confirming a 10/05/1972 Conversation Concerning the Discovery of ECCS 350 PSI Low Reactor Pressure Switches to Be Out of Calibration - Dresden Unit 3

ML17252B019
Person / Time
Site:	Dresden
Issue date:	10/05/1972
From:	Worden W Commonwealth Edison Co
To:	Grier B US Atomic Energy Commission (AEC)
References
Download: ML17252B019 (1)

Text

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l o:>O SUBJECT DPR2 DRESDEN NUCLEAR POWER STATION UNIT 3o ~ ~< ,--~ THIS WILL CONFIRM A CONVERSATION WITH MR H* DANCE OF YOUR ~ fil ~ .~  ! OFFICE AT 1400 HOURS THIS DATE CONCERNING ECCS 350 PSI eg ~ ] l Low REACTOR PRESSURE SWITCHES BEING OUT or CALIBRATION SHOWE~ ~ £::!]: \ THAT TtvO OF THE FOUR SWITCHES HAD TRIPPE.D SETTING GREATER TH~~ ~~~.-1.; \ C!)H THE LIMIT IN TABLE 3 2o 2. OF TECHNICAL SPECIFICATIONS. 0 ~~z I r~ ~ TABLE 3o2o2o STATE THE TRIP SETTING SHOULD BE GREATER THAN E-1 ~ E~ .-~.:0 \ i::.1 0 Q) 330 ?SIG AND LESS THAN 350 PSIG PRESSURE SWITCH 3-253-52A2 ~ ~ ~ *~ '. .t *1 TRIP SETTING WAS FOUND TO BE 371 PSIGo PRESSURE SWITCH if i3 ,: <.. :*~ SF-1201 (RS-69) OCT l 0 1972 . ~ ~ Q. ... ' ~. '*' 33-263-52B2 TRIP SETTING WAS FOUND TO BE 355 PSIG. PRIOR TO THIS CALIBRATION THE "AS LEFTw SETTING ON THESE SWITCHES WAS 355 PLUS OR MINUS 5 PS!Go OUR LIMIT FOR THESE SWITCHES HAS NOW BEEN CHANGED TO 325 PLUS OR MINUS 10 PSIGo THIS SETTING IS IN THE CENTER OF TECHNICAL SPECIFICATIONS PRESSURE RANGE AND ALLOWS GREATER MARGIN FOR INSTRUMENT DRIFT WALTER Po WORDEN 7 SUPTo DRESDEN NUCLEAR POWER STATION DPR25 3 1400 ECCS 350 PSI 10-4-72 1500 3o2o2o 3o2o2 330 350 3-~3-52A2 371 33-253-52B2 355 355 5 325 10 .0

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