HELIOS2: Benchmarking Against Hexagonal Lattices
18th Symposium of AER on VVER Reactor Physics and Reactor Safety (2008, Eger, Hungary)
Spectral and Core Calculation
Abstract
The critical experiments performed at the Hungarian ZR-6 reactor and experiments
performed at General Purpose P (GPP) critical facility at RRC ?Kurchatov Institute? are used
to benchmark HELIOS-2, as part of its ongoing validation and verification activities. The
comparisons presented in this paper are based on, ZR6-VVER-EXP-001, Vol. 1 (2007), LEUCOMP-THERM-015, Vol. 4 (2005), and LEU-COMP-THERM-061, Vol. 4 (2002).
On ZR-6, single cell, macro cell, and 2D calculations on selected experiments, regular and
perturbed, are made. In the 2D calculations, the radial leakage is treated by including the
reflector in the calculations, representing only axial leakage by a measured axial buckling.
keff and RMS reaction rates comparisons are presented.
On GPP critical facility, the entire experiment is modelled as 2D. Comparisons of keff and
fission rates are presented and the effect of the axial buckling on keff is investigated.