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SMALL MODULAR REACTOR

 

Engineering productivity for the design and analysis of complex thermofluid systems such as those found in large coal fired power plants is vastly improved by modeling in Flownex®. In addition, the system knowledge and understanding gained by the modeler is invaluable in subsequent activities.

Gary de Klerk - Pr. Eng - Turbine process group technology - ESKOM

 

PRIMARY CYCLE

BulletReactor Model

  • Any fuel geometry or type
    • Molten salt, Gas, Water, and liquid metal
  • Neutronics/Heat Generation options
    • Built-in point kinetics
    • C# User-defined calculations
    • External calculations and temperature or heat map exchange

BulletHeat Exchangers and Steam Generators

  • Helical Coil
  • U-Tube Recirculating Boiler
  • Compact Heat Exchanger
  • User Defined Fluids, Pressure, Heat transfer correlations

 

BulletFlow Circulation

  • Pumps
  • Gas Circulators
  • Natural Circulation 

HTGR network

 

CONTROL PHILOSOPHY DEVELOPMENT

  • Integrated plant transient response
  • Built-in DCS library
  • C# user scripting
  • MatLab/Simulink coupling
  • OPC coupling

 

SAFETY ANALYSES

  • Relief valve sizing
  • Passive heat removal analyses:
    • Natural circulation
    • Radiative heat transfer
    • Conjugate heat transfer

 

ACCIDENT ANALYSES

Calculate temperatures, leak rates, pressure waves (water hammer) and pipe support loads for:

  • Loss of Cooling Accident (LOCA)
  • Pump trip
  • Tube break in Steam Generator

 

RESEARCH OR MATERIALS TEST REACTORS

  • Calculation of core flow and temperature distribution.
  • Calculation of irradiation loop cooling and flow requirements.
 

INTEGRATED SYSTEM SIMULATION

  • Control philosophy testing
  • Power ramp rate calculations

 

HTR COMPONENT MODELLING

  • Pebble Bed or Prismatic Block Reactor core calculation: coolant, moderator and fuel temperatures, neutronic feedback from built in point kinetics or external software.
  • Once-through steam generator: calculation of boiling rates, dry out position, metal temperatures; sizing of flow distribution orifices for boiling stability
  • Passive heat removal design: calculation of natural circulation in liquids, gasses and two phase fluids.

 

RANKINE SECONDARY CYCLE

 BulletSteam turbine and supporting systems
  • Start-up, shut-down and load following operation
  • Turbine trip control
  • Gland steam systems
  • Lubrication systems

 

BulletCondensers

  • Wet and dry condenser heat exchange
  • Condenser level following
  • Air leak detection

FeedWater

BulletFeed Water Systems

  • Pipeline, valve and pump sizing
  • Cavitation, flashing and condensing detection
  • Pump performance and NPSH
  • Feed water heater performance and tube leaks
  • Flash tank behavior
  • De-aerator

BulletCooling water circuits

  • Pipeline, valve and pump sizing.
  • Water hammer.
  • Cooling tower response.
  • Heat exchanger sizing.
  • Water reticulation flow balancing & energy efficiency.