Recent News
SNAP Version 4.0.3 Released
April 29, 2022
AptPlot 8.0.1 Updated
April 29, 2022
PyPost 4.0.1 Released
October 29, 2021

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 4.5.0 - Released 4/29/2022:

  • The TRACE Plug-in has been updated to support TRACE Version 5.0 Patch 7. This option is now present during ASCII import and has been added to the list of versions available through Model Options.
  • Support has been added for the lead (Pb) fluid type in fluid systems.
  • Support has been added for Mega Energy units (lumegae) for SNAP variables, and control system engineering units options. The units are MJ for SI units and MBtu for British.
  • These engineering units are automatically used by APT plot and PyPost when plotting the "hstoreng" plot variable.
  • Added support for FMESHECHECK, ERRSEEDIT, MOVEHSMESH namelist variables.
  • Removed the support for C1RC2 - C2RC5. These are available if the model version is set to less than 6.
  • Support has been added for the wire wrap geometry for heat structures.
  • The TRACE Plug-in has been updated to include model merge capabilities for the following components:
    • Jet Pump, Separators, Heaters, Turbines, Heat Structures, Trips, Trip Setpoint Factor Tables, Trip Signal Expressions.
  • The TPR import logic for the EXTSOU property of a power component was updated to prevent loading the "unset" value from a TPR file.
  • An issue has been resolved that prevented the PARCS Mapping file from exporting with the correct component numbers.
  • An issue was resolved where some View Template elements failed to load inside of TRACE models.
  • The TypPWR converted sample has been updated to fix errors introduced when opening in SNAP Version 4.0.2.
  • The coupled TRACE/PARCS sample has been updated to better represent how a coupled MSLB case might be implemented.