SNAP was written to make it easier to do activation analysis.  The program includes a user controlled library of material specifications for commonly activated materials and a facility specific operating time history.  Minimum data requirements (for in-core items) are the full power neutron flux, date the item was placed in service, date that it was removed, and date corresponding to the final activity estimate. Program outputs include an exposure histogram, scaling factors, isotopic breakdown by grams, and isotopic breakdown by curies, as well as scaling factors. 

SNAP was extensively tested and benchmarked against ORIGEN2.1 (ORIGEN).  ORIGEN is the standard for performing activation calculations and used by all organizations performing activation analysis services.  SNAP doesn't short change on the analysis.  It constructs a complete differential equation matrix corresponding to the problem and the cross sections available.