الفهرس 
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Abstract
The aim of this work is to study the utilization of thorium-based fuels in the intermediate neutron spectrum of a tight pitch LWR lattices. The analysis was performed using MCNP-5 and the WIMSD5 codes. The potential benefits of using thorium in LWR fuel, a thorium fueled benchmark was analyzed. Comparison was made between the state-of-the-art codes, MCNP-5 and the WIMSD5. Eigenvalue and isotope concentrations were compared for a PWR pin -cell model up to high burnup (60GWd/ton). The first step of the investigation of the thorium fuel cycle is the validation of the results obtained from the codes for this particular type of fuel.