Fifth Dynamic AER Benchmark - A Benchmark for Coupled Thermohydraulic System/3D Hexagonal Neutron Kinetic Core Models - Comparison of Results - Level 1

The fifth dynamic benchmark was defined at the 7th AER-Symposium, held in Hörnitz, Germany in 1997. It is the first benchmark for coupled thermohydraulic system/three-dimensional hexagonal neutron kinetic core models. In this benchmark the interaction between the components of a VVER-440 NPP with the reactor core has been investigated. In this presentation, the first results obtained by means of the codes DYN3D/ATHLET (Forschungszentrum Rossendorf), BIPR8/ATHLET (Kurchatov Institute Moscow) und HEXTRAN/SMABRE (VTT Energy Espoo) were compared. Both thermohydraulics and neutron kinetics parameters show dif-
ferences.