Multiplication factors of single pin hexagonal cells and VVER-1000 reactor assembly

The multiplication factors for assemblies of 7, 331 and 397 hexagonal cells, with reflective boundary conditions on the outer boundaries, has been studied. It is observed that the results for the assemblies and for the unit hexagonal cells are in good agreement, in the range covered by these assemblies. For this study, the code DRAGON (Version-4) has been used. Monte Carlo results for unit cell and for complete assembly are also presented for comparison.