Recent News
SNAP Version 4.2.0 Released
November 3, 2023
AptPlot 8.0.3 Updated
May 22, 2023
PyPost 4.0.3 Released
August 18, 2022

TRACE Plug-in

The TRAC/RELAP Advanced Computational Engine (TRACE) code is the latest in a series of advanced, best-estimate reactor systems codes developed by the U.S. Nuclear Regulatory Commission for analyzing transient and steady-state neutronic-thermal-hydraulic behavior in light water reactors. It is the product of a long term effort to combine the capabilities of the NRC’s four main systems codes (TRAC-P, TRAC-B, RELAP5 and RAMONA) into one modernized computational tool.

The TRACE plug-in requires installation of the PARCS plug-in. Please note that the PARCS plug-in will automatically be selected for installation with the TRACE plug-in if you choose to install SNAP directly from the web site. If you download the installation packages to a folder for later installation, the TRACE plug-in will not be available for installation unless you include the PARCS plug-in in your download.

The TRACE Plug-in User's Manual provides instructions for working with TRACE models in SNAP. This Manual is also available as a searchable help set in SNAP.

Change Log

Version 4.6.1 - Released 11/3/2023:

  • Python Bindings and Diff/Merge support was added for the following components: Vessel, Plenum, Channels, Multi-Channels, Candu Channels, Pump, Fluid Power, Vessel Junctions, PARCS Mappings, Heat Structures
  • Advanced python bindings have been implemented for Channels, Fills, Breaks, Heaters and Pipes.
  • Python Functions in TRACE models may now be set to access the TRACE Python Bindings.
  • An issue has been resolved that would prevent preserving SNAP variable references to Trip setpoints, or control block inputs in restart cases.
  • The vessel Levels dialog has been updated to prevent invalid vessel levels to be entered.
  • Jet Pumps and Heaters have been updated to edit and export the Laminar Shape Factor.
  • Vessel Junctions have been upodated to export the EOS and Phase Change value from the Vessel Junction onto the spawned single junctions.
  • The PARCS Mapping component has been updated to resolve issue that would prevent the ASCII viewer from opening.
  • The PARCS Mapping component Split Locations dialog has been updated to allow changing the type of split (i.e. for Hydro Components or Heat Components).
  • The PARCS Mapping component Hydraulic Components and Thermal Fractions dialogs have been updated to support the add/remove buttons without failure in explicit mode.
  • A warning dialog has been added to notify the user that changing the PARCS mapping mode from explicit to automatic will result in loss of ability to export splits.
  • The bundled W4Loop model sample was updated to correct the display of the primary system view.
  • The merge behavior for crossflow connections in 1D hydraulic components has been updated to ensure that new connections are created correctly, and to support undo/redo.
  • The channel initialization behavior has been updated to initialize the RDPWR array with fuel nodes initialized to 1.0 and cladding nodes initialized to 0.0.
  • The ability to create and delete hydraulic components and heat structures through python bindings has been implemented.
  • Zero-celled hydraulic components were updated to export the gas and liquid species with the placeholder values summing to 1.0.