Three-dimensional transport correction in fast reactor core analysis

Three-dimensional (3-D) transport corrections for Keff, control rod worths, neutron spectra and power distributions are calculated for the fast critical assemblies ZPPR-9, -10 and -13. The calculations are performed in 7 energy groups using the 3-D and 2-D transport codes TRITAC and TWOTRAN-II. The evaluated 3-D transport corrections are compared with those predicted by a 2-D RZ model and a combined XY, RZ and R model to assess the accuracy of these 2-D models. The RZ model yielded some errors in estimating the transport corrections to Keff, control rod worths, neutron spectrum and power distribution, while the combined model predicted them with good accuracy. (author)