Recent News
SNAP Version 3.1.5 Released
February 24, 2021
AptPlot 7.0.2 Updated
February 24, 2021
PyPost 3.0.1 Released
October 6, 2020

Obtaining SNAP

SNAP was developed and is maintained by Applied Programming Technology, Inc. (APT) under funding from the US Nuclear Regulation Commission and the US Department of Energy in addition to other industry organizations.

SNAP is based on a plug-in architecture. Support for each of the analysis codes, TRACE, MELCOR, RELAP5, etc.., is provided in separate self-contained plug-ins.

In general, the NRC allows distribution of its reactor safety codes and tools to domestic organizations (utilities, vendors, academic institutions, commercial enterprises) and international organizations located in countries that participate in the Code Applications and Maintenance Program (CAMP), the Cooperative Severe Accident Research Program (CSARP) or the Radiation Protection Computer Code Analysis and Maintenance Program (RAMP).

If you have not already done so, create an account on the SNAP website for the “point of contact” for your organization . The “point of contact” must be the same person identified in the non-disclosure agreement. If multiple points of contact are desired, please make sure they are also listed on the signed copy of the non­disclosure agreement.

Access to the following NRC funded code plug-ins requires submitting a signed SNAP non-disclosure agreement to:

U.S. Nuclear Regulatory Commission
Office of Nuclear Regulatory Research Code
Reactor Analysis Branch
ATTN: Branch Chief
M/S 10-B58

Washington, DC 20555

Analysis Codes Plug-in Program
CONTAIN CONTAIN CAMP
FRAPCON, FRAPTRAN, FAST FRAP CAMP
MELGEN/MELCOR MELCOR2X CSARP
PARCS PARCS CAMP
RADTRAD RADTRAD RAMP
SCALE SCALE CAMP
TRACE TRACE CAMP

If you have any questions regarding access to the NRC plug-ins, please contact:

Chester Gingrich
USNRC SNAP Project Manager
email: CGG@nrc.gov
voice: 1-301-415-2173

The following code plug-in is available to CAMP members under the CAMP SNAP User's Group (CAMP-SUG) agreement. CAMP members interested in using this plug-in must complete and send a signed copy of the CAMP-SUG agreement to sug‑support@appliedprog.com.

Analysis Codes Plug-in Program
RELAP5-MOD3 RELAP5c CAMP-SUG

The following code plug-ins are available to SNAP User's Group (SUG) members.
Please contact sug-support@appliedprog.com for information of joining the SNAP User's group.

Analysis Codes Plug-in Access
GOTHIC GOTHIC SUG
RELAP5-MOD3, RELAP5-3D RELAP5-3D SUG
RETRAN-3D RETRAN-3D SUG

You can download the code directly from this site after you have registered an account and submitted any required signed agreements.