Abstract : Since Thorium has widely gained attention around the world, the characteristics of Thorium as a nuclear fuel are in serious need of intensive study. Accelerator Driven Systems (ADS), with a thorium fuel cycle, could provide a way to incinerate heavy actinides safely with low waste and
offers a proliferation-resistant nuclear power technology. In accelerator driven system, the two main envisioned improvements that could be made are the spallation design and the Thorium fuel cycle. In this paper, there are 3 different types of simulation experiments included. For Spallation simulation work (chapter 1), I used Geant4 to simulate spallation interactions with
various energies of proton beams incident on a Lead spallation target. The simulations showed that most of the neutrons were produced at the front surface of the target, where the proton beam entered, and many were scattered through the rear surface of the target. In chapter 2, the radii of the cylinder were varied for identifying the optimal radius of neutron production.The result showed that 16 cm radius of the Thorium cylinder was producing the highest rate of neutron yield at 0.9, 1.0 and 1.1 GeV proton beam energy. The varying radius has also affected the neutron energy spectra. In the final chapter, a cylinder composed of a combination of Thorium-232 and Uranium-235 was placed outside of a Lead spallation target. The composition of Thorium-232 and Uranium-235 was varied with the range between 4% and 20% of Uranium-235.The result showed that the neutron yield gradually increased as the amounts of Uranium-235 increased.
The highest rate of neutron yield was recorded at 80% 232Th and 20% 235U. Taken together, the results will be helpful to newly design the fuel assembly for improving the efficienty in the ADSR core.
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