Recent News
SNAP Version 2.6.1 Released
February 28, 2018
AptPlot 6.8.0 Updated
February 19, 2018
PyPost 1.3.3 Released
February 19, 2018

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 3.8.9 - Released 2/28/2018:

  • The additive loss controllers have been updated to allow connections to the first and last edge of a 1D hydraulic component unless that edge is connected to a Fill or a Break.
  • The export logic for control block type 18 has been updated to write the second input connection in the ICB3 field instead of the ICB2 field.
  • An issue was resolved that caused the TRACE import "with resources" process to report an incorrect error message when the references "resource model" file is not a valid TRACE MED file.
  • The model validation logic for signal variable type 59 has been updated to resolve a false-positive error when referencing a spawned component of a heat structure.
  • Signal variable logic has been updated to resolve an issue where signal variable type 106 could export a 0 for the vessel sector number.
  • The fill model notebook export has been updated to resolve an issue where the export would fail when a fill has table rows, but the fill table is disabled.
  • The TRACE ASCII import logic has been updated to ignore lines that start with a '#' character.