Recent News
SNAP Version 4.1.3 Released
May 18, 2023
AptPlot 8.0.3 Updated
May 22, 2023
PyPost 4.0.3 Released
August 18, 2022

Symbolic Nuclear Analysis Package

The Symbolic Nuclear Analysis Package (SNAP) consists of a suite of integrated applications designed to simplify the process of performing engineering analysis. SNAP is built on the Common Application Framework for Engineering Analysis (CAFEAN) which provides a highly flexible framework for creating and editing input for engineering analysis codes as well as extensive functionality for submitting, monitoring, and interacting with the codes.

Important Notice Concerning Log4J Vulnerability (CVE-2021-44228): The Log4j utility is included in earlier versions of AptPlot and SNAP. We recommend that you promptly delete any earlier versions of AptPlot or SNAP that you may have installed and update to the latest version of this software. AptPlot Version 8.0 which is now included as a plug-in to SNAP Version 4.0.1 was released in October 2021.  These versions of AptPlot and SNAP do not include the Log4J utility. 

Download SNAP

Getting Started

A guide to downloading and installing SNAP and its prerequisite software.


Users' manuals, on-line instruction, tutorials, and other SNAP related materials.

SNAP Plug-ins

Find information about the various SNAP plug-ins available to users.

Technical Support

Technical support is available to CAMP members, NRC contractors and SNAP User's Group members.

Change Log

SNAP 4.1.3 - Released 5/18/2023:

  • An issue was resolved in which the 'Move Up' button in certain dialogs would throw an exception when dealing with a dialog that had hidden columns.
  • The Model Editor "Revert Modifications" file menu option will now always be enabled when the model has been saved to disk.
  • Real Variables have been updated to allow defining a set of enumerated values.
  • Unitless model properties may not reference SNAP numeric variables with any engineering unit.
  • Table variables have been updated to include add_row, remove_row, and set Python methods.

see older releases