Kaynak güdümlü alt kritik sistemlerde kaynak verimliliğinin dizayn parametrelerine bağımlılığının incelenmesi

ADS, which is first proposed by Carlo Rubbia, is an operationally safe alternative for inceration, transmutation since it has a sub critical core and with a fast neutron Unified with a power production perspective, source efficiency presents a paramount importance. The major energy input in an ADS design, is the accelerator power. With increased source efficiency, it is possible to minimize this energy and maximize productivity. In this thesis, first a brief introduction to ADS is provided. In some, detail the transmutation concept, accelerators, spallation targets, fuel elements and coolant are discussed. Following that the theory of source multiplication, subcritical multiplication factor and source efficiency are presented, since these concepts are crucial to ADS design. Four benchmark analytical solutions in spherical coordinates were presented as: "One Group One Region Flat Source", "One Group One Region Dirac Source", "One Group Two Region System with Flat Source in the Inner Region", "Two Group One Region Dirac Source". The behaviors of key parameters were studied for the four benchmark solutions through Mathematica modelled graphs. Then, using finite difference multi group diffusion code DIFSP, the analytical results and numerical result are compared for the four benchmark solutions and the calculated nuclear parameters associated error margins are presented. Concluding the authenticity of solutions, the variations of source efficiency with respect to ADS parameters is assessed. Tables and figures for target radius and source efficiency, blanket radius and source efficiency are presented and their relations are discussed. Also parameters for an alternative fuel option of ADS, americium and plutonium mix, are calculated and discussed for different ratios, acting as a benchmark for minor Actinide fuels. Lastly, a brief summary of the results and inferences for ADS are presented.