Abstract
It is a time-consuming and error-prone task to prepare neutronics model for the discrete ordinates transport codes (S_N codes) in manual way. A more efficient solution is presented in this paper, which shift geometric modeling to computer aided design (CAD) system, and to use an interface program for S_N codes to convert the CAD model to neutronics model, and then generate the input file of S_N code automatically. The detailed conversion method is described and some kernel algorithms are implemented in SNAM, an interface program between CAD system and S_N codes. The method has been used to convert the ITER benchmark model to the input file of S_N code successfully. It is shown that the conversion method is a correct, efficient and potential solution for S_N code modelling.
