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Home / SNAP / Plug-ins / TRACE Plug-in /

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 4.6.9 - Released 5/6/2025

  • Several Namelist variable editors are now fully tested through the automated integration testsuite.
  • Integration tests have been added to the custom property view editors that appear in the Model Options component.
  • As issue was resolved when exporting the Lua Hooks side range.
  • Issues were resolved when attempting to set a signal variable reference to a Multi-Channel component within the GUI editors.
  • An issue was resolved that caused the Reference Channel component numbers to be modified during ASCII export.
  • The Combo Box properties within Fills and Pipes in the Hydraulic Components now support User Integration tests.
  • Automated testing has been added for all of the custom TRACE dialogs that appear in the Model Options component.
  • The Combo Box property within Breaks in the Hydraulic Components now support User Integration tests.
  • The Combo Box properties within Model Options now support User Integration tests.
  • An issue was resolved that caused comparing components with tables that have varying numbers of columns to fail.
  • The python bindings testing has been updated to validate that all properties are within the automated testsuite.
  • The Power component has been updated to resolve an issue that would prevent entering the REACTCOOL array correctly when enabled. Issue 108
  • A model validation issue has been resolved that would report errors when a reverse friction is enabled for 1D hydraulic components, but not vessel component. Issue 109
  • The heat structure boundary conditions have been updated to support referencing an Exterior component for ECI cases.
  • The Hydraulic Components were updated to support modifying the hydraulic connections to exterior components for ECI cases.
  • An issue was resolved that inadvertently suppressed the updated component report after modifying the ISOLVEDEF namelist variable to be set to the Finite Element Conduction option.
  • Added ASCII context for the Mixed Numerics Time Integration/Spatial Difference methods exported values.
  • The CSS Controlled values have been updated to only be modified within the Model Options CSS Controller when using python bindings or the Diff/Merge dialog.

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