الفهرس 
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Abstract
The neutronic design of Egypt Second Research Reactor (ETRR-2) core conversion from oxide (U30g-Al) fuel to silicide (U3Si2-AI) fuel was carried out. The silicide fuel was chosen for the core conversion because of its high maximum fuel meat density (4.8 gU/cm3) which expected to increase the operation cycle length to meet the higher reactor availability and utilization. Analysis of ETRR-2 core was done fii’st for the conversion from oxide (U 30g-AI) core, through a series of mixed oxide-silicide cores, to an all silicide (U3Si2-AI) core with the same meat density of 3.017 gU/cm3. The second analysis was done for the conversion from low meat density (3.017 gU/cm3) silicide core, through a series of lower-higher meat density silicide cores, to an all higher meat density (3.54 gU/cm3) silicide core.
The standard computer codes such as WIMSD4 code and diffusion code CITY AP (new version of CITATION II developed by INV Apts Nuclear Engineering Division) were used in core neutronic calculations. The calculation results show the safe operation conditions of the intermediate or transition cores and equilibrium cores. With higher density silicide fuel, ETRR-2 core operation cycle length was increased from 15 (Full Power Days) FPDs to 20 FPDs which reduce the total cost of fuel element, number of spent fuel elements, and times of core rehteling. Also, the reactor utilization and production of radioisotopes can be increased.