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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 4.0.1 - Released 4/27/2019:

  • Updated to the TPR Specification for TRACE V5.1255.
  • The TPR import behavior has been updated to resolve an error which would prevent importing a full plant model from a TPR that contains a channel with reflood turned on and water rod components.
  • The channel component TPR import logic has been updated to read the Pitch-To-Diameter Ratio from the average fuel PD block, and to initialize the "Use Radiation Enclosure" flag from the channel PD block.
  • The channel component has been updated to initialize the dimension of the view factor and beam length arrays when setting a channel to use the radiation enclosure.
  • The model report viewer used by the "Check Model" feature has been updated to use a more simplified display. The new display allows arbitrary portions of the report to be selected and copied to the clipboard. The top level headings can be collapsed or expanded by double clicking on their headings. The new report viewer will be enabled on a plug-in by plug-in basis, starting with the TRACE plug-in.
  • The TPR import routines have been updated to reconnect sensitivity coefficients that reference individual components.
  • The following plot variable engineering unit types were added to the TRACE plug-in post-processing for animation and plotting: degree, heatrt, perecr, esourc, percen, pervol, volfrc, ppm, mfrw, b10mfr, mfrss, imfrw, imfrs
  • The vessel volumetric and edge data editor was updated to include the ability to filter cell data by downcomer and core. A "Display Mode" option will update the cell table view to include only valid locations for the selection (ie Downcomer->All will update the table view such that only the Radial/X locations appropriate for the downcomer will be displayed and any axial locations which are not included will be highlighted out). Additionally, data specific to the selected display mode will be used for calculating cell volumetric totals (ie Core->Ring 2 total volume calculations will only include values appropriate for that location)
  • A stand-alone utility for adding time-averaged values from a TRACE XTV file into a PARCS Depletion file has been added to SNAP. This utility may be executed through the pdat.exe. A new job step has been added to the TRACE plug-in and Engineering Template plug-in that supports running PDAT as part of a job stream.
  • The PARCS mapping component in a TRACE model has been updated to export a PDAT input XML file that maps TRACE XTV data channels to PARCS assembly locations through the right-click pop-up menu.
  • An issue was resolved in the TRACE XTV read routines that prevented demultiplexed files from being read that contain more time slices than data channels.