Validation of the APROS thermal-hydraulics against the PACTEL test facility

APROS - Advanced PROcess Simulator - has been developed since 1986 together with the Technical Research Centre of Finland (VTT) and IVO Power Engineering Ltd (IVO PE) for process and automation design, safety analysis and training simulator applications. Up to now the APROS development has required more than 150 man years. APROS applications include nuclear and fossil power plant models, but also chemical as well as pulp and paper processes can be modeled. PACTEL - PArallel Channel TEst Loop - is an experimental integral test facility for VVER-440 nuclear power plants. VVER nuclear power plants have some special features like hexagonal fuel assemblies and horizontal steam generators. Therefore PACTEL experiments provide for VVER-purposes unique information which can not be obtained with normal PWR integral test facilities. PACTEL experiments are also very important for computer codes, like APROS, for VVER validation