Recent News
SNAP Version 2.6.6 Released
November 7, 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 3.9.6 - Released 11/7/2018:

  • ASCII Contexts have been to be more granular and open appropriate editors for the underlying data for the following components: Control System Components, Vessel Components, 1D Hydraulic Components, Power Components, and Sensitivity Coefficients
  • The resource import logic has been updated to prevent the removal of variables, model notes and job streams from the source model.
  • The water rod editing dialog for channels has been updated to initialize new water rods to have three temperature nodes when the channel uses the finite element radial geometry model. Additionally the dialog automatically selects the new rod when the Add button is pressed.
  • The water rod radial mesh editing dialog has been updated to show finite elements when the channel uses the finite element radial geometry model.
  • The table variable reference logic for fills, breaks and general tables has been updated to prevent an error from occurring after deleting a table variable that is referenced by a component.
  • An issue was resolved which prevented the undo/redo of trip references defined in the Trip Initiated Timestep data.
  • The vessel junction component has been updated to prevent an error from occurring when the dispersed fields are active in the model. Currently the initial velocities for droplet bubble fields is set to 0.0 in vessel junctions.
  • Single junctions, pumps and valves have been updated to disable the cross-flow connection and leak path editors when the component has zero cells.
  • A new animation that animates a TRACE heatstructure component during a reflood case has been added to the Animation Plugin. A heatstructure data channel (e.g. the outer surface temperature data) can be specified, which will result in the bean being animated using the selected data and the fine mesh elevation to create a color gradient that is applied to the bean based on a user defined color map. The bean can be drawn as a cylinder or rectangle. If the bean is drawn as a rectangle, the user can choose to include the permanent and dynamic elevation nodes in the animation. This bean is located in the TRACE Beans submenu as 'Reflood Heatstructure'.