The purpose of this work is the neutronic analysis of the 80 MWth LBE cooled XADS by means of deterministic methods. The calculations, carried out by the ERANOS code ver. 1.2, have been performed: . at beginning of cycle in absence of the external neutron source with a 3D hexagonal geometry and its 20 cylindrical schematisation; . during the fuel cycle in the presence of the external source with the 20 cylindrical geometry description (the system reactivity is practically coincident with that obtained by the real H3D geometry). The calculations at BOC have been performed to test the system behaviour with the introduction of small variations in the LBE coolant and fuel MOX densities, and modifying the number of fuel subassemblies. The fuel cycle analysis has been carried out by using: . the standard ERANOS algorithm that executes burn up calculations (generally performed in several time steps) without the updating of the microscopic cross sections during the cycle (only the nuclide densities are replaced); . a new methodology with the updating of microscopic cross sections (at different time steps) to consider self-shielding effects properly. The latter algorithm has been tested and validated on the XADS: its results are however very similar to the standard values, with a period of 930 days at full power corresponding to a proton current of about 5.9 mA.
PDS-XADS Fuel Cycle Analysis by means of deterministic methods
Peluso, V.;Sarotto, M.
2003-12-09
Abstract
The purpose of this work is the neutronic analysis of the 80 MWth LBE cooled XADS by means of deterministic methods. The calculations, carried out by the ERANOS code ver. 1.2, have been performed: . at beginning of cycle in absence of the external neutron source with a 3D hexagonal geometry and its 20 cylindrical schematisation; . during the fuel cycle in the presence of the external source with the 20 cylindrical geometry description (the system reactivity is practically coincident with that obtained by the real H3D geometry). The calculations at BOC have been performed to test the system behaviour with the introduction of small variations in the LBE coolant and fuel MOX densities, and modifying the number of fuel subassemblies. The fuel cycle analysis has been carried out by using: . the standard ERANOS algorithm that executes burn up calculations (generally performed in several time steps) without the updating of the microscopic cross sections during the cycle (only the nuclide densities are replaced); . a new methodology with the updating of microscopic cross sections (at different time steps) to consider self-shielding effects properly. The latter algorithm has been tested and validated on the XADS: its results are however very similar to the standard values, with a period of 930 days at full power corresponding to a proton current of about 5.9 mA.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
