Recent News
SNAP Version 2.5.7 Released
July, 17, 2017
AptPlot 6.7.4 Released
August 18, 2017
PyPost 1.2.4 Released
August 18, 2016

Obtaining SNAP

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) or Cooperative Severe Accident Research Program (CSARP).

SNAP is developed and maintained by the NRC's contractor, Applied Programming Technology, Inc. (APT). You can download the code directly from this site after you have registered an account and submitted this non-disclosure agreement. At this point, while SNAP is still in beta status there is no charge to domestic users for obtaining the code, although this will most likely change (to a cost structure much like that of TRACE and RELAP5) in the near future. No official support is provided while the code is still in beta status, although users are encouranged to provide feedback and submit bug reports. Please note that certain SNAP plug-ins, are developed and maintained through SNAP User's Group funding. These are only made available to SUG members.

For CAMP member country organizations, SNAP is supported and maintained like TRACE and RELAP5.

To request activation of your account for SNAP downloads, please do the following:

  1. 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.

  2. Fill out and sign the SNAP Non-Disclosure Agreement. Send a hard copy to:

    Computer Code Distribution
    Mailstop TWFN 10 B58
    Code Development Branch
    U.S. Nuclear Regulatory Commission
    Washington, DC 20555

If you have any questions regarding access to SNAP, please contact:

Chester Gingrich
USNRC SNAP Project Manager
voice: 1-301-415-2173

For information on obtaining other NRC Developed Reactor Safety Computer codes please visit