EFFECT OF HEXBU-3D FEEDBACK AND BOUNDARY CONDITION MODELS ON THE CALCULATED REACTOR CORE CHARACTERISTICS OF LOVIISA NPP
18th Symposium of AER on VVER Reactor Physics and Reactor Safety (2008, Eger, Hungary)
Core operation, Experiments and Code Validation
Abstract
This paper discusses the effect of feedback and boundary condition models used in the Loviisa core design code HEXBU-3D on the calculated reactor core characteristics. Two alternative feedback models and two boundary condition models are shortly demonstrated and their effects on the calculated reactor physical properties are considered. Computational results by these alternative models will also be compared with measured reactor physical properties of the recent Loviisa-1 and Loviisa-2 cores.