Cross-section generation methodology for three-dimensional transient reactor simulation

An important aspect of three-dimensional transient reactor calculations is the cross-section modeling algorithm. Based on our experience in transient simulations of different accident scenarios with Pennsylvania State University's coupled code TRAC-PF1/NEM, an original cross-section generation methodology was developed and tested. Well-known features were combined with new developments to achieve an accurate and efficient coupled three-dimensional kinetics/thermal-hydraulic system modeling. Our approach is designed to describe both initial steady state and the entire range of conditions expected during a transient. It differs from the existing cross-section generation procedures in both history and instantaneous models