Core monitoring system modernization at Paks NPP to serve unit power uprating

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Core monitoring system modernization at Paks NPP
to serve unit power
uprating

• Cs. Major, Cs. Horváth, J. Végh, I. Pós. Z. Kálya
• e-mail macsa_at_sunserv.kfki.hu

IAEA TM on Increasing Power Output and
Performance of NPPs by Improved IC
Systems Prague, May 30, 2007
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Presentation overview

• Introduction to the new VERONA system
• Supporting power increase to 108
• Current status and further improvements of
  reactor physics calculations
• VERONA user interface demo

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Introduction 1

• VERONA VVER On-line Analysis
• Replacement of the VAX/VMS based core monitoring
  system at all units of Paks NPP
• Main functions data acquisition and processing,
  core analysis, information presentation, data
  archive, operation condition and limit violation
  check

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Introduction 2
Network hardware
Rack 2
Console
Rack 1
RPH2 server
EXD server
VDP2 server
RPH1 server
Servers Windows 2003 MS SQL Server 2000
VDP1 server
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Introduction 3
Operative display PC
TFT monitor
Displays Windows XP GE Fanuc iFix 3.5
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Introduction 4

Main display format of the new VERONA screen
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Power uprating 1

• Most important modifications in the technology
• New fuel (3.82 enrichment, profiled, 12.3 mm
  lattice pitch)
• Decreased hydroaccumator (HA) pressure (59 ? 35
  bar)
• New, more stable primary pressure control
• New HP turbine inlet nozzle, modified turbine
  controller
• Replacement of high-pressure preheaters
• Several minor enhancements on the secondary side
• Modernized generator cooling
• Full reconstruction of core surveillance system

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Power uprating 2

• Most important modifications in the core
  calculations
• More accurate off-line and on-line reactor
  physics programs
• The standard core design code runs on-line in the
  new system
• Adaptive model combination of core-follow
  calculation data with the results given by the
  on-line in-core measurements
• Improved subchannel outlet T calculation (coolant
  mixing)
• Extensive VV using data from all units (7 fuel
  cycles)
• Stability robustness test parallel operation
  (2 cycles)
• Successful application of new models at Unit 4
  in 2006

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History of reaching 104 then 108 power at Unit 4
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Overview picture showing Unit 4 parameters at 108
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Current status 1
Unit 2 VERONA upgrade in 2008 Current unit power
100
Unit 4 New VERONA Current unit power 108
photowww.npp.hu
Unit 1 New VERONA Ready for 108
Unit 3 New VERONA Current unit power 100
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Current status 2

• New VERONA on Unit 1, 3, 4 simulator
  installed, licensed and operative
• VERONA-t Test SW server (2007)

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Further work

• Enhanced core calculations to handle the new
  fuel with burnable (gadolinium) poison
• New 2D and 3D extrapolation module for the 2sec
  cycle (same method as in the 5min cycle)
• Further modifications in the neutron physics
  model (e.g. flexible radial and axial resolution)

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User interface demo

• Normal operation (Unit 4) - Core map, Overview
• Control rod drop event on Unit 4 (consequence of
  the large Western-European blackout on
  11.04.2006.)
• Core map
• Rod position
• Using Archive and On-line Trends after the event
• Back to normal operation - Core map, Overview,
  Rod position

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Thank you for your attention!