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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 4.1.0 - Released 9/3/2019:

  • Updated to latest TRACE User's Manual, V5.1290.
  • Updated to the TPR Specification for TRACE V5.1290.
  • Channel import of partial length rods has been updated to resolve an issue that would prevent importing an average rod location in the partial length rod array, and to write an error message if a rod group contains rods of differing lengths.
  • The editor for the Last Axial Cell property of a channel fuel rod group has been updated to prevent selecting a value past the end of the fuel region of the channel.
  • The power component connections dialog has been updated to suppress the cpower column when the power operates on channels.
  • Support for the flat plate geometry input has been added to pipes and vessels. These are activated by setting the pipe type to 14 and vessel type to 4, respectively.
  • Heat structures have been updated to support the critical heat flux flag values for Gambill-Weatherhead and Sudo-Kaminaga correlations.
  • Fills and breaks have been updated to resolve how the work with cell-centered angle models. Fills and Breaks include the Elevation Change property, written out in the "FELV" and "BELV" field. The utility for converting models between cell-centered elevation, cell-centered angle, and edge angle has been updated to correctly account for the elevation change across fill and break components.
  • The IELV editing utility that converts hydraulic cell elevation data between gravs (IELV=0), cell centered elevations (IELV=1) and cell dz's (IELV=2) was updated to generate correct elevation data for FILL, BREAK and PLENUM components when the IELV namelist property is modified. The elevation calculation logic for PLENUM has been modified to include the plenum junction lengths.
  • The FILL, BREAK and PLENUM components have been updated to ensure that changes to their cell centered elevations are properly reflected in the drawn views of adjacent components.
  • The 1D hydraulic components have been updated to attempt to refresh adjacent hydraulic components when changes are made to the elevation or orientation of cells and edges. This automatically updates the appearance of the connected components when changes are made.
  • The split pipe operation has been updated to resolve an issue where immediately after splitting a pipe the new shared pipe edge properties are not kept properly in sync. This issue would only occur on the model editing session where the split operation was performed; saving and loading the model resolves behavior.