ML17238A745

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 Commonwealth Edison Co
To:	Morris P US Atomic Energy Commission (AEC)
References
Download: ML17238A745 (2)

Text

MSG.NR 330 TLXA290 PC209

• • 50-249 Q NNC447 CCH 073NN130447>PD WU JOL 0742P EST03/13/72 ZCZC 2*NL PD TDJL MORRIS ILL 13 DR PETER A MORRIS DIRECTOR DIVN ON REACTOR LICENSING US ATOMIC ENERGY COMM WASHDC 20545 BT .

DPR-25 DRESDEN NUCLEAR POWER STA~ION 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 WAS-DISCOVERED.~T 15:00 HRS. ON 3/7/7~ 'WHILE .CONDUCT!

NG A 'MONTHLY SURVEILLANCE TEST. T~E ERROR WOULD NOT HAVE BEEN NOTED EXCEPT THAT *-AT THE TIME OF THE SURVEILLANCE A LPCI SYSTEM LOW-FLOW .SWITCH WJSI.,,,,...

ALSO* OUT OF CALIBRATION.-* THIS SET-UP A CONDITION

'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

• 1NITIALL~ REVIEWED THE PROOLEM IT ~AS FELT TO BE A 30-DAY NOTIFICATION BECAUSE THE LPdI SUB-SYSTEM WAS ALWAYS OPERA~LE. TH EFFECT OF THIS WIRING ERROR WAS ONLY TO PROHIBIT PERMISSIVE 1 TO SPRAY THE DRY WELL WITH GREATER THAN 2/3RDSr CORE HEIGHTH. THIS FUNCTION IN SPITE OF TH WIRING ERROR COULD HAVE BEEN PERF-OMED BNEX . , ._ .

BMN~~Bl$S $WITCH .

W P ~ORDEN PLATYCPP HRS OF REGION 3 RPT ON NOT VOF. LPCI 15:00 ~/7/72 LPCI 3/8/72. 30 LPCI 2/3RDS '*; ,

231A EST

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