ML17238A745

Dresden Power Station Unit 3 - Letter Regarding a Wiring Error Uncovered in the LPCI Logic to Spray the Containment Under Accident Conditions

ML17238A745
Person / Time
Site:	Dresden
Issue date:	03/13/1972
From:	Worden W P Commonwealth Edison Co
To:	Morris P A US Atomic Energy Commission (AEC)
References
Download: ML17238A745 (2)

Text

• • MSG.NR 330 TLXA290 PC209 50-249 Q NNC447 CCH 073NN130447>PD WU JOL ZCZC 2*NL PD TDJL MORRIS ILL 13 0742P EST03/13/72 DR PETER A MORRIS DIRECTOR DIVN ON REACTOR LICENSING US ATOMIC ENERGY COMM WASHDC 20545 BT . DPR-25 DRESDEN NUCLEAR POWER UNIT 3 . THIS WILL CONFIRM CONVERSATION AT 16:00 HRS. THIS DATE WITH H. DANCE, VOF REGION 3 COMP(IANCE REGARDING A WIRING ERROR UNCOVERED IN THE LPtI LOGIC TO SPRAY.tHr CONTAINMENT UNDER ACCODENT CONDITIONS. , . .* .). ',, ' . . ' "THE WIRING ERROR 15:00 HRS. ON WHILE .CONDUCT! NG A 'MONTHLY SURVEILLANCE TEST. ERROR WOULD NOT HAVE BEEN NOTED EXCEPT THAT *-AT THE TIME OF THE SURVEILLANCE A LPCI SYSTEM LOW-FLOW .SWITCH WJS ALSO* OUT OF CALIBRATION.-THIS SET-UP A CONDITION I.,,,,... * 'DIFFERENT THAT THAT NORMALLY FOUND DURING TH SURVEILLANCE TEST. THE WIRING ERROR WAS CORRECTED ON 3/8/72. -THIS INCIDENT WAS* NOT REPORTED SOONER BECAUSE WHEN THE STATION REVIEWED THE PROOLEM IT FELT TO BE A 30-DAY NOTIFICATION BECAUSE THE LPdI SUB-SYSTEM WAS ALWAYS TH EFFECT OF THIS WIRING ERROR WAS ONLY TO PROHIBIT PERMISSIVE TO BNEX . ,,._ . $WITCH . -, SPRAY THE DRY WELL WITH GREATER THAN 2/3RDSr1CORE HEIGHTH. THIS FUNCTION IN SPITE OF TH WIRING ERROR COULD HAVE BEEN PERF-OMED W P PLATYCPP HRS OF REGION 3 RPT ON NOT VOF. LPCI 15:00 LPCI 3/8/72. 30 LPCI 2/3RDS '*; , .. -231A . :r> U) EST F :t> -*. -4 S2'D:;vo ::on-1 ::t ;:o USAEC HQS GnJN f"-Oo :E: . fT'I nr.= ("") oi-1"'1 :Cl:* :z ,..., /' < .V>O::O ,.., (/) ;;oC') 0 (') (") CD -c 0. s 3: VI t' ,. O\* t L.-6 .,,

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