Abstract
A Simplified Neutron Activation Analysis Program (SNAP) was written for use in the characterization of activated components for radwaste transport and disposal. The program includes a user controlled library of material specifications for commonly activated materials and a facility specific operating history. SNAP was extensively tested and benchmarked against ORIGEN2.1 (ORIGEN)(1). ORIGEN is the standard for performing activation calculations and is used by most organizations performing activation analysis services. Some additional features in the SNAP program include automatic thermal flux correction for analysis of components outside of the reactor core and adjustment of the thermal cross sections for temperature. SNAP automatically adjusts the thermal cross sections for temperature and combines the thermal and the incore cross sections for a user entered correction factor.
Bundled with the SNAP code is a point kernal shielding library (WINSHLD). The user can automatically adjust the SNAP activity estimate to account for a dose rate measurement on the item. The program is written in C++ for use on the Windows operating systems. Program output options include results in weight or activity units as well as direct calculation of scaling factors. SNAP run times are generally 1 minute or less on a Pentium 300 computer. The program was written to make the calculation process of activation analysis more easily accessible for characterization efforts.
This paper will provide an over-view of the SNAP computer code and present analysis results and ORIGEN comparisons performed in the analysis of the jet pump support pin.
