الفهرس 
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Abstract
Improving the cycle length of power reactors can be achieved by numerus techniques one of these techniques is utilizing a neutron absorber material in the reactor core. This thesis studies the effect of introducing Cadmium in to the reactor core as an additive in fuel rod’s clad in VVER1200 reactor core which is a Russian type PWR and noticing how this will affect the global effective multiplication factor of the system. WIMS5B and COMSOL multiphysics codes were used to model VVER-1200 reactor assemblies and core. The results showed that using six assemblies with Cd additive of about (0.03%)in the clad composition gives an acceptable value of k-eff about 1.1758 at the beginning of the core cycle considering that all control rods in the top position.