Recent News
SNAP Version 4.2.1 Released
February 16, 2024
AptPlot 8.0.4 Updated
February 16, 2024
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 4.2.1 - Released 2/16/2024:

  • SNAP model view templates are now exported in XML. The model view template importer was updated to handle both the xml and binary versions of these files. This update allows for simple GIT (or other version control systems) comparison of view template changes.
  • The named value selection dialog has been revised to improve the user interface, allow for sorting and filtering values.
  • The generic table row editing dialog has been updated to resolve an issue where custom paste behavior was needed.
  • Several threading issues were resolved that should improve the stability of the Model Editor.
  • The 2D Renderer for integer variables has been updated to support trailing spaces in the custom label text.
  • An issue has been resolved which would change the z-order of components after performing a paste special operation.
  • The property set panel API was updated to include a routine which will expand all groups.
  • The generic floating point table editing dialog was modified to improve the user interface.

see older releases