Benchmarking of reactor physics codes for VVER

An overview on benchmarking activities for reactor physics codes for VVER type reactors within the European code platform NURESIM is given. Different levels of benchmarks were calculated - mathematical benchmarks for diffusion codes with given cross section data and with neutron transport reference solutions as well as benchmarks based on experimental data. Benchmarking is performed at different levels - fuel rod lattice and reactor core, static and kinetics calculations. Validation calculations are performed using the codes APOLLO, CRONOS and DYN3D.