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=Text=
=Text=
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* Com~alth One 0             Edison *
s~al Plaza, Chicago, Illinois  
* Fir s~al Plaza, Chicago, Illinois Address Reply to: Post Office Box 767
'f *.
                          '-'Chicago, Illinois 60690 BBS Ltr. #579-75                                           Dresden Nuclear Power Station R. R. #1 Morris, Illinois 6o450 September ~' 1975 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operation-Region III
Address Reply to: Post Office Box 767  
: u. s.       Nuclear Regulatory Commission 799 Roosevelt Road
\\.. _,....:*
* Glen Ellyn, Illinois                   6o137
'-'Chicago, Illinois 60690 BBS Ltr. #579-75 Dresden Nuclear Power Station R. R. #1 Morris, Illinois 6o450 September ~' 1975 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operation-Region III
* SUBJWr:         REPORT OF ABNORMAL OCCURRENCE PER SEX:TION 6.6.A OF THE TEX:HNICAL SPEX:IFICATIONS REACTOR PRESSURE 6oo PSI SWITCH*SE!'POINT DRD'l'
: u. s. Nuclear Regulatory Commission 799 Roosevelt Road
* Glen Ellyn, Illinois 6o137
* SUBJWr:
REPORT OF ABNORMAL OCCURRENCE PER SEX:TION 6.6.A OF THE TEX:HNICAL SPEX:IFICATIONS REACTOR PRESSURE 6oo PSI SWITCH*SE!'POINT DRD'l'  


==References:==
==References:==
1}   Regulatory Guide 1.16 Rev. 1 Appendix A
1} Regulatory Guide 1.16 Rev. 1 Appendix A
: 2)   Notification of Region III *of u. s. Nuclear Regulatory Commission Telephones _P. Johnson, 0920 hours on August 28, 1975 Telegrams* J. Keppler, 1045 hours on August 28, 1975 3}   Drawing Numbers         12E2465 Report Number:           ~249/75;f40 Report Date:         September 4, 1975 Occurrence Date:             August 27, 1975
: 2) Notification of Region III *of u. s. Nuclear Regulatory Commission Telephones _P. Johnson, 0920 hours on August 28, 1975 Telegrams* J. Keppler, 1045 hours on August 28, 1975 3}
* Facility:           Dresden Nuclear Power Station, Morris, *Ulinoie                     ,\'\all Section Docltot Clort mmrIFICATION OF OCCURRENCE
Drawing Numbers 12E2465 Report Number:  
      . On       August 27, 1975, during routine instrument. surveillance, pressure switches PS}-263-51A and.-51B were fo\md with setpointe above the Technical Specification
~249/75;f40 Report Date:
September 4, 1975 Occurrence Date: August 27, 1975
* Facility: Dresden Nuclear Power Station, Morris, *Ulinoie mmrIFICATION OF OCCURRENCE
,\\'\\all Section Docltot Clort  
. On August 27, 1975, during routine instrument. surveillance, pressure switches PS}-263-51A and.-51B were fo\\md with setpointe above the Technical Specification
* limit of ~6oo psi:'!
* limit of ~6oo psi:'!
CONDITIONS PRIOR TO OCCURRENCE Uni t-3 was in the shutdown mode for a refueling outage.
CONDITIONS PRIOR TO OCCURRENCE Uni t-3 was in the shutdown mode for a refueling outage.
* September 4, 1975 DESCRIPTION OF OCCURRENCE -~ - -
September 4, 1975 DESCRIPTION OF OCCURRENCE -~ - -
Pressure switches 26.3-51A and -51B were found with setpoints of 605 psi and 615_ psi respectively. Th~ switches permit the Low Condenser Vacuum and Main Steam Line Valve Closure (~cram signals to be bypassed *when reactOr pressure is less than.6oo psi.
Pressure switches 26.3-51A and -51B were found with setpoints of 605 psi and 615_ psi respectively.
DESIGNATION.OF APPAREm' CAUSE .OF OCCURRENCE (Unusual Service Conditions)
Th~ switches permit the Low Condenser Vacuum and Main Steam Line Valve Closure (~cram signals to be bypassed *when reactOr pressure is less than.6oo psi.
Long periods at zero preas\ire apparently allow inatrum~t setpoints to drift signif-icantly out 'of oaJ.ibration. *'l;'he defµiit~ve*.caU.S~:.of :setp0int drift has not been establish~d~:                         :  *      * **          *
DESIGNATION.OF APPAREm' CAUSE.OF OCCURRENCE (Unusual Service Conditions)
: 1. .;_* ,. **
Long periods at zero preas\\ire apparently allow inatrum~t setpoints to drift signif-icantly out 'of oaJ.ibration. *'l;'he defµiit~ve*.caU.S~:.of :setp0int drift has not been establish~d~:
ANALYSIS OF OCCURRENCE The setpointe of switches 263-51A and -51.B had l~at been .checked on March 8, 1975.
: 1..;_*
ANALYSIS OF OCCURRENCE The setpointe of switches 263-51A and -51.B had l~at been.checked on March 8, 1975.
Both switches were within the station limits at that time, five weeks before the unit Shutdown for retueling. Because* the switches have been demonstrably reliable between routine surveillances, it is considered unlikely that any.
Both switches were within the station limits at that time, five weeks before the unit Shutdown for retueling. Because* the switches have been demonstrably reliable between routine surveillances, it is considered unlikely that any.
aigpificant aet:Point drif~&occurred during operation. In any event, the setpoint vai(l;l;e*~ "as found" woU.1.d. have provided a scram permissive at 6o5 psi. Consequently, the public was not endangered by this occurrence.
aigpificant aet:Point drif~&occurred during operation. In any event, the setpoint vai(l;l;e*~ "as found" woU.1.d. have provided a scram permissive at 6o5 psi. Consequently, the public was not endangered by this occurrence.
CORREX:TIVE ACTION The switches were immediately reset to within the station limit of 58<> 5 psi.
CORREX:TIVE ACTION The switches were immediately reset to within the station limit of 58<> +/- 5 psi.
Additional action will be taken as def'iriitive drift causes are.identified.
Additional action will be taken as def'iriitive drift causes are.identified.
                                                                                  +/-
FAILURE. DATA Pressure switches 26.3-51A and -51B are Meletron Model 372 pressure sensors with a range of 28-1~0 psi. These switches have had a history of setpoint drifting at Dresden. Station evaluation of replacement instrumentation is cont~;-
FAILURE. DATA Pressure switches 26.3-51A and -51B are Meletron Model 372 pressure sensors with a range of     28-1~0 psi. These switches have had a history of setpoint drifting at Dresden. Station evaluation of replacement instrumentation is cont~;-                 *
* B. B. StePhenson Superintendent
. BBSs'WEH:smp File/NRC
. BBSs'WEH:smp File/NRC
* B. B. StePhenson Superintendent


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Latest revision as of 12:37, 8 January 2025

Report of Abnormal Occurrence Per Section 6.6.A of the Technical Specifications Reactor Pressure 600 PSI Switch Setpoint Drift
ML17252A185
Person / Time
Site: Dresden  
(DPR-019, DPR-025)
Issue date: 09/04/1975
From: Stephenson B
Commonwealth Edison Co
To: James Keppler
NRC/RGN-III
References
BBS Ltr. #579-75 50-249/75-40
Download: ML17252A185 (3)
v • d • e


Text

{{#Wiki_filter:::;.> ,..., "4.f0. Com~alth Edison * ~ .* ~i.,, One Fir 0 s~al Plaza, Chicago, Illinois 'f *. Address Reply to: Post Office Box 767 \\.. _,....:* '-'Chicago, Illinois 60690 BBS Ltr. #579-75 Dresden Nuclear Power Station R. R. #1 Morris, Illinois 6o450 September ~' 1975 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operation-Region III

u. s. Nuclear Regulatory Commission 799 Roosevelt Road
  • Glen Ellyn, Illinois 6o137
  • SUBJWr:

REPORT OF ABNORMAL OCCURRENCE PER SEX:TION 6.6.A OF THE TEX:HNICAL SPEX:IFICATIONS REACTOR PRESSURE 6oo PSI SWITCH*SE!'POINT DRD'l'

References:

1} Regulatory Guide 1.16 Rev. 1 Appendix A

2) Notification of Region III *of u. s. Nuclear Regulatory Commission Telephones _P. Johnson, 0920 hours on August 28, 1975 Telegrams* J. Keppler, 1045 hours on August 28, 1975 3}

Drawing Numbers 12E2465 Report Number: ~249/75;f40 Report Date: September 4, 1975 Occurrence Date: August 27, 1975

  • Facility: Dresden Nuclear Power Station, Morris, *Ulinoie mmrIFICATION OF OCCURRENCE

,\\'\\all Section Docltot Clort . On August 27, 1975, during routine instrument. surveillance, pressure switches PS}-263-51A and.-51B were fo\\md with setpointe above the Technical Specification

  • limit of ~6oo psi:'!

CONDITIONS PRIOR TO OCCURRENCE Uni t-3 was in the shutdown mode for a refueling outage. September 4, 1975 DESCRIPTION OF OCCURRENCE -~ - - Pressure switches 26.3-51A and -51B were found with setpoints of 605 psi and 615_ psi respectively. Th~ switches permit the Low Condenser Vacuum and Main Steam Line Valve Closure (~cram signals to be bypassed *when reactOr pressure is less than.6oo psi. DESIGNATION.OF APPAREm' CAUSE.OF OCCURRENCE (Unusual Service Conditions) Long periods at zero preas\\ire apparently allow inatrum~t setpoints to drift signif-icantly out 'of oaJ.ibration. *'l;'he defµiit~ve*.caU.S~:.of :setp0int drift has not been establish~d~:

1..;_*

ANALYSIS OF OCCURRENCE The setpointe of switches 263-51A and -51.B had l~at been.checked on March 8, 1975. Both switches were within the station limits at that time, five weeks before the unit Shutdown for retueling. Because* the switches have been demonstrably reliable between routine surveillances, it is considered unlikely that any. aigpificant aet:Point drif~&occurred during operation. In any event, the setpoint vai(l;l;e*~ "as found" woU.1.d. have provided a scram permissive at 6o5 psi. Consequently, the public was not endangered by this occurrence. CORREX:TIVE ACTION The switches were immediately reset to within the station limit of 58<> +/- 5 psi. Additional action will be taken as def'iriitive drift causes are.identified. FAILURE. DATA Pressure switches 26.3-51A and -51B are Meletron Model 372 pressure sensors with a range of 28-1~0 psi. These switches have had a history of setpoint drifting at Dresden. Station evaluation of replacement instrumentation is cont~;- . BBSs'WEH:smp File/NRC

  • B. B. StePhenson Superintendent

-~~~ "* Alat'Y'-.,;:.. t ~""6'°'"'"*RIC"...,,._...,. __ _ . ~---'_~lii.rectorate of RcS"atory Op~rations ltegio-:i III

  • - W u.s.. rtuclell.r Regul41tofy Coro::nission 19~ ROC>sevelt Road Glef.l &llyu, IL 60137 Date..,K.., tT({;'CJ I

er. *.IO.*~r< A,f4

  • I DC I Ld.'.5(~ A, fl1,

~ ly 5C? w I cc: I Bernard C. Ruse ha, Ditf!ctor ~ '211 Directorate of Licensing ~,

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