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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 3.9.0 - Released 4/20/2018:

  • The Split and Merge pipe renodalization operations have been updated to automatically update the Navigator after the operation is complete.
  • The PARCS mapping file import logic has been updated to resolve an issue importing automatic mapping files where the VOLRMAP3 entry is not the last entry in the file.
  • An ASCII import issue has been resolved which would prevent volume signal variables on containment compartments from importing correctly.
  • The heat structure and channel validation logic has been updated to report a single error when any of the gap-gas mass fraction values have not been set. Additionally an issue has been resolved where channels would report unknown gap-gas mass fractions when the fuel-clad interaction is disabled.
  • The ASCII import logic of heat structures has been updated to resolve an issue which caused the boundary data for CONTAN compartment boundaries to import from ASCII incorrectly.
  • PARCS file types are now available inside a TRACE model when building job streams.
  • The TRACE job step has been updated to allow coupled TRACE/PARCS inputs to be manually enabled when the TRACE model is supplied via external file reference rather than a model node. When manually set the PARCS input file, MAPTAB file, and auxiliary file inputs are created. If the PARCS input file is connected to a PARCS model node, the auxiliary file input is not available.
  • The channel value for gap-gas pressure exported when the gap gas are disabled has been updated to write a non-zero value out.
  • The validation logic for view factors and beam lengths in channel components and radiation enclosures have been updated to report only a single error message if any of the view factors or beam lengths have not been set. The channel validation logic has also been updated to prevent writing out error messages for enclosure levels above the lowest level when the advanced channel calculation is turned off.

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