DYN3D - A 3-DIMENSIONAL CORE MODEL FOR STEADY STATE AND TRANSIENT ANALYSIS IN THERMAL REACTOR

The 3D core model DYN3D developed firstly for analyses of transients in thermal reactors with hexagonal fuel assemblies was extended by a new version DYN3D/R for reactors with quadratic fuel elements. The method used in Cartesian geometry is described. Numerical results for benchmarks as the NEACRP rod ejection benchmarks are compared with the reference solutions. Results of uncontrolled withdrawal of control rod bank are shown. The efficiency of steady-state neutronic calculation by using multiprocessor workstation is presented.