Integrated simulation for the preconceptual optioneering of the STEP breeder blanket design

The UK Spherical Tokamak for Energy Production (STEP) program is currently progressing the conceptual engineering design of a Spherical Tokamak-based fusion reactor. The program includes a project concerned with design of the reactor breeding blanket. The objective of this work was to develop a low fidelity, integrated simulation approach to support preconceptual optioneering and exploration of the breeder blanket technologies design space. This simulation approach allowed for parameter sweeps of different Tokamak design points to take place by varying key inputs. The objective of the simulation approach is to enable designers to assess the impact of these parameters on blanket performance. This research resulted in development of a workflow internally within the project team and externally through a design service contract. A variety of tools were integrated into a modelling framework including a bill of materials-like object orientated data structure, open-source Tokamak neutronics workflow, and parametric blanket geometry tools capable of outputting material volume fractions and flow layouts. The research concluded with results produced from the integrated simulation feeding into a wider qualitative assessment of blanket technologies for chosen Tokamak design points and with further development of the workflow.