Analysis of Refueling of Individual Fuel Assemblies in the Reactor during One Fuel Campaign

Models for initial and stationary fuel loads for VVER-1200 have been developed to perform calculations for meeting acceptance criteria when replacing partially burnt fuel assemblies with fresh ones during the campaign. The article presents calculations of the core neutron-physical characteristics and assesses compliance with acceptance criteria during the replacement of a partially burnt-out fuel assembly with a new one at various time points throughout a fuel campaign at the VVER-1200 nuclear power plant.