Abstract
The three-dimensional (3D) neutronics and thermal- hydraulics (T/H) coupling code MARS/COREDAX has been developed. The 3D nodal kinetics code COREDAX is based on the Analytic Function Expansion Nodal (AFEN) method and the T/H code MARS is a best-estimate system analysis code that is based on the RELAP5/MOD3 and COBRA-TF codes. In order to verify the MARS/COREDAX code, the Phase II problem in the OECD main steam line break benchmark was analyzed. This MSLB benchmark has been defined in order to simulate the core response and the reactor coolant system response to a relatively severe steam line break accident condition. The comparison of the MARS/COREDAX results with other coupled codes will be presented.
