Experience of Nuclear Power Plant NEK Modeling in Computer Code APROS

GEN energija, as an interested investor in a new nuclear power plant (NPP) at Krsko site, is developing its own engineering capacity for deterministic safety analyses (DSA) and other technical analyses of NPP. APROS is a multifunctional software for modelling and dynamic simulation of various physical processes of different types of power plants, including PWRs. APROS allows us to build complete models of whole plants, with a complete thermalhydraulic, electrical and regulation systems including reactor kinetics. Such models could be used in several stages, with its use for new NPP design verification, possible optimization of NPP systems, for training purposes as an engineering simulation tool and also as a model for full scope simulator. The purpose work presented in the paper is to get experience with APROS and is small step in building model of primary circuit of Krsko Nuclear Power Plant. The mode of water accumulator pressurised with nitrogen is modelled with computer program APROS. The accumulator of Nuclear Power Plant Krsko with corresponding piping is developed and results are compared with the test performed in Nuclear Power Plant. The results of simulation, namely the accumulator level and pressure are in line with the measurement and are inside measurement error.