Benchmarking of DYN3D/RELAP5 Code Package using the Fifth AER Dynamic Problem for Coupled Codes

The paper presents a brief description of the DYN3D/RELAP5 code package developed on the base of coupling the system code RELAP5 and the 3D neutron kinetics code DYN3D. Elaboration of the coupling interface has been performed in the framework of a joint research project.
The fifth dynamic AER problem for VVER-440 reactor plant has been solved using the code package. Calculation results are compared with the results obtained earlier in the FZR using DYN3D/ATHLET. Code-to-code comparison shows a close agreement between the key transient parameters.