Analysis Of The Effect On Two-dimensional Transport-burnup Calculation Of Dual-cooled Waste Transmutation Blanket For The Fusion-Driven Sub-critical System

The burnup calculation is one of most important tasks for reactor engineering design and research. The transport-burnup calculation of one-dimension can guide scientists to explore the rule and to give qualitative analysis, but in order to get a proposal and guidance for the actual engineering, the transport-burnup calculation of two-dimension is needed. The neutronics optimization calculation of one-dimension for the fusion-driven subcritical reactor (FDS-I) which had been designed by FDS team and the transport-burnup calculation of two-dimension are mainly carried out in the thesis by numeric simulations and the analysis.The neutronics optimization calculation of one-dimension was performed based on the objectives and principles of design by the home-developed mutil-functional code VisualBUS and its data library HENDLl.O/MG. The optimized case now can satisfy the objectives, i.e.: 1) subcriticality (k_eff1.05),3)the consistent initial loading and consumptions of LLMA (Long-Lived Minor Actinides) and spent plutonium (Pu) in a fuel cycle length based on the proportion of the annual spent fuel from a reference PWR (pressurized water reactor).4) the maximum power density limited by the thermal-hydraulics design (Pmax <100MW/m³).Based on the two-dimensional (2D) calculation model, neutronics transport and burnup analysis were carried out by the code VisualBUS with its HENDLl.O/MG. Three cases, in which the material compositions, the initial loading and k_eff of the 2D calculation model are respectively equal to those of the one-dimensional (1D) calculation model, were calculated to clarify the effect in these different models at the condition of the same sizes and material compositions of radial direction.There are great differences about neutronics parameters in former two cases. Firstly, the zone volumes of the 2D model are smaller than those of the 1D model, so that the initial loadings are smaller. As a result, the neutronics parameters are smaller than those of the 1D model. Secondly, the average total neutron yield has become higher, which is caused by increased their probability of fission reactor with massed materials, so the neutronics parameters are bigger than those of the 1D model. However, the results of the 2D model are close to those of the 1D model in the latter case. As a result, the neutronics parameters can satisfy the design objectives. It is also shown that optimized case is feasible. In addition,when we process design in detail, it is necessary to clarify the effect by neutronics transport and burnup analysis in 3D model.