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SNAP Version 2.6.1 Released
February 28, 2018
AptPlot 6.8.0 Updated
February 19, 2018
PyPost 1.3.3 Released
February 19, 2018

FRAP Plug-ins (FAST, FRAPCON and FRAPTRAN)

Fuel Analysis under Steady-state and Transients (FAST) a Fortran-based computer code that calculates the steady-state and transient response of light-water reactor fuel rods during long-term in-reactor burnup, up to and including dry storage conditions. The code calculates the temperature, pressure, and deformation of a fuel rod as functions of time-dependent fuel rod power and coolant boundary conditions.

The FRAPCON code calculates the steady-state response of light water reactor fuel rods during long-term burnup. The code calculates the temperature, pressure, and deformation of a fuel rod as functions of time-dependent fuel rod power and coolant boundary conditions. FRAPCON is designed to generate initial conditions for transient fuel rod analysis by the FRAPTRAN computer code

The FRAP installation package for SNAP includes both the FAST and FRAPTRAN plug-ins. The legacy FRAPCON plug-in has been superceded by the FAST plug-in. The FAST plug-in will open legacy FRAPCON models and can be used to run FRAPCON.

Change Log

Version 3.2.0 - Released 3/13/2018:

  • The Power History/Shape Control editor was modified to include a new text field editor for specifying power shape numbers in the Power History data. This new editor makes it much simpler to paste values and multi edit rows. A quick edit feature was added to allow quickly entering values by simply selecting the cell and pressing the desired power shape number.
  • The Spent Fuel block is now disabled by default when a new FAST model is created. This data can be enabled by setting the property “Enable Spent Fuel” to true or selecting “Enable” from the components right-click pop-up menu.
  • New FAST models will now have the Coolant Conditions block enabled by default. Additionally, the following blocks were renamed:  Boundary Conditions is now Coolant Conditions, Reactor Conditions is now Reactor Power.  The attributes in the blocks are still the same as they were previously.
  • The plug-in was updated to support converting FRAPCON boundary conditions to the FAST format. This new logic handles the conversion of both inlet and bulk coolant specified boundary conditions.
  • The batch command SET_CODE was added to support setting the code input specification. This can be used to convert FRAPCON coolant conditions to the FAST format. The format of the batch command is as follows:

                    FAST SET_CODE [FRAPCON3.4|FRAPCON_4.0|FRAPCON_4.0.1|FAST_1.0]

  • Output filenames can now be specified for exported FAST models. The output, plot, restart, gambit, and vtk filenames can be set in the Code Output attribute group of Model Options. Additionally, the VTK, Gambit, and Restart files are now supported in the FAST job step.

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