A computer code development for evaluation of primary coolant specific activities using ORIGEN2 code

A computer program SAEP to evaluate specific activities due to fission products in the primary coolant was developed, which can be applied to the integral reactor such as SMART as well as commerical PWRs in existence. The ORIGEN2 code is integrated into the SAEP as a subroutine, which could solve the inhomogeneous differential equations to detemine coolant activities, The benchmarking result for UCN 3 and 4 units shows that specific activities by the SAEP are very close to those of the conventional calculations. Terefore, it is expected that the SAEP developed in this study will be used practically in evaluation of specific activities in the primary coolant of various types of nuclear reactors including the integral reactor