ML17238A745: Difference between revisions

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| number = ML17238A745
| number = ML17238A745
| issue date = 03/13/1972
| issue date = 03/13/1972
| title = Dresden Power Station Unit 3 - Letter Regarding a Wiring Error Uncovered in the LPCI Logic to Spray the Containment Under Accident Conditions
| title = Letter Regarding a Wiring Error Uncovered in the LPCI Logic to Spray the Containment Under Accident Conditions
| author name = Worden W P
| author name = Worden W
| author affiliation = Commonwealth Edison Co
| author affiliation = Commonwealth Edison Co
| addressee name = Morris P A
| addressee name = Morris P
| addressee affiliation = US Atomic Energy Commission (AEC)
| addressee affiliation = US Atomic Energy Commission (AEC)
| docket = 05000249
| docket = 05000249
Line 15: Line 15:


=Text=
=Text=
{{#Wiki_filter:** 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 . ,,._ . $WITCH . -, SPRAY THE DRY WELL WITH GREATER THAN 2/3RDSr1CORE HEIGHTH. THIS FUNCTION IN SPITE OF TH WIRING ERROR COULD HAVE BEEN PERF-OMED W P PLATYCPP HRS OF REGION 3 RPT ON NOT VOF. LPCI 15:00 LPCI 3/8/72. 30 LPCI 2/3RDS '*; , .. -231A . :r> U) EST F :t> -*. -4 S2'D:;vo ::on-1 ::t ;:o USAEC HQS GnJN f"-Oo :E: . fT'I nr.= ("") oi-1"'1 :Cl:* :z ,..., /' < .V>O::O ,.., (/) ;;oC') 0 (') (") CD -c 0. s 3: VI t' ,. O\* t L.-6 .,,
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                                **                                                    50-249 Q NNC447 CCH 073NN130447>PD WU JOL                             0742P EST03/13/72 ZCZC 2*NL PD TDJL MORRIS ILL 13 DR PETER A MORRIS DIRECTOR DIVN ON REACTOR LICENSING US ATOMIC ENERGY COMM WASHDC 20545 BT               .
DPR-25 DRESDEN NUCLEAR POWER STA~ION UNIT 3                                           .
THIS WILL CONFIRM CONVERSATION AT 16:00 HRS. THIS DATE WITH H.
DANCE, VOF REGION 3 COMP(IANCE REGARDING A WIRING ERROR UNCOVERED IN THE LPtI LOGIC, TO .SPRAY.tHr       .* .). ',,
CONTAINMENT UNDER ACCODENT CONDITIONS.
"THE WIRING ERROR WAS-DISCOVERED.~T 15:00 HRS. ON                   3/7/7~ 'WHILE           .CONDUCT!
NG A 'MONTHLY SURVEILLANCE TEST. T~E ERROR WOULD NOT HAVE BEEN NOTED EXCEPT THAT *-AT THE TIME OF THE SURVEILLANCE A LPCI SYSTEM LOW-FLOW .SWITCH WJSI.,,,,...
ALSO* OUT OF CALIBRATION.-* THIS SET-UP A CONDITION
'DIFFERENT THAT THAT NORMALLY FOUND DURING TH SURVEILLANCE TEST.
THE WIRING ERROR WAS CORRECTED ON 3/8/72. -
THIS INCIDENT WAS* NOT REPORTED SOONER BECAUSE WHEN THE STATION
*1NITIALL~ REVIEWED THE PROOLEM IT ~AS FELT TO BE A 30-DAY NOTIFICATION BECAUSE THE LPdI SUB-SYSTEM WAS ALWAYS OPERA~LE. TH EFFECT OF THIS WIRING ERROR WAS ONLY TO PROHIBIT PERMISSIVE         1 TO SPRAY THE DRY WELL WITH GREATER THAN 2/3RDSr CORE HEIGHTH. THIS FUNCTION IN SPITE OF TH WIRING ERROR COULD HAVE BEEN PERF-OMED BNEX        .                  , ._                    .
BMN~~Bl$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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Latest revision as of 08:35, 24 February 2020

Letter Regarding a Wiring Error Uncovered in the LPCI Logic to Spray the Containment Under Accident Conditions
ML17238A745
Person / Time
Site: Dresden Constellation icon.png
Issue date: 03/13/1972
From: Worden W
Commonwealth Edison Co
To: Morris P
US Atomic Energy Commission (AEC)
References
Download: ML17238A745 (2)
v • d • e


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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