Although fissile material is usually not considered when thinking of fusion reactors (except infusion-fission hybrid concepts), they have a potential to breed nuclear weapon relevant material (Pu, Tritium) whichshould not be neglected. We developed a MCNPX model of the 2006 published concept A of the European PowerPlant Conceptual Study to analyze the potential for Pu production in a fusion reactor. Production potentials arecalculated for varying uranium content replacing the Pb-17Li alloy in different blankets of the reactor. The resultsshow that significant amounts of fissile material can be produced even with limited amounts of source material. Theproduction in different zones will be limited by additional heating due to fission and due to a reduced tritiumbreeding rate. Burnup calculations indicate that the produced plutonium is weapon usable with over 90% Pu-239even for extremly high burnups. As the technology is and will be in development for the next decades, there issufficient time to implement and test applicable safeguard measures or develop proliferation resistant designs.
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