Abstract

This work is aimed at running the first IRIS reactor core with mixed thorium dioxide fuel(ThO_2-UO_2 and ThO_2-PuO_2).Calculations are performed by using Dragon 4.0.4 and Citation codes.The results show the multiplication factor(K_(eff)) for central and peripheral assemblies as a function of burnup.To ensure the proliferation resistance,the value of ~(235)U enrichment is 20%.The K_(eff) is calculated using Dragon 4.0.4 for a single fuel rod and the model developed to fuel assembly,while the whole core was calculated using Citation code.For a fuel burnup,the use of increased enrichment fuel in the IRIS core leads to high reserve of reactivity,which is compensated with an integral fuel burnable absorber.The self-shielding of boron is in an IRIS reactor fuel.The effect of increased enrichment to the burn-up rates,and burnable poison distribution on the reactor performance,are evaluated.The equipment used in traditional light water reactors is evaluated for designing a small unit IRIS reactor.

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