A comparison of the FA's models with the detailed and simplified description in the MCU code calculations

Full-scale three-dimensional computer model describing neutron-physical processes that occur in the VVER-1200 reactor core involves detailed FA geometry description. However, the detailed description significantly complicates input data, increases calculation time and error probability. Consequently, creation of simplified models of the design elements becomes necessary. In present work, simplified geometrical models of FA design elements are suggested. Calculations of simplified models are compared to calculations of exact models that completely correspond to the working general view drafts provided by OKB 'Hydropress'. It is demonstrated that in many problems the use of simplified description of FA elements geometry is possible. (orig.)