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Abstract
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Reactivity is the most important parameter to predict dynamics behavior of fission nuclear reactors core. In this research, the dynamics of the Bushehr reactor core is investigated by nodal model in SIMULINK/MATLAB. The time evolution of the relative neutron density has been computed for different values of step reactivity insertion, in 6 nodes within the mentioned core. The present results show that the relative neutron density values in the bottom nodes are more than those of the top nodes within the reactor core. However, there is an acceptable agreement between the previous and present results.
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