The transition from conceptual fusion concepts to viable reactor designs requires navigating a vast and complex design space, demanding integrated evaluation across physics and engineering. Traditional design workflows struggle to efficiently explore this space; broad systems studies are typically carried out at low fidelity, whilst high-fidelity studies are performed infrequently. We introduce BLUEMIRA, an open-source, multi-fidelity, parametric framework which is designed to bridge the gap between low-fidelity systems codes and high-fidelity studies. By coupling automated analyses with sequential optimisation routines we demonstrate how BLUEMIRA facilitates deep design exploration taking into account systems such as the Toroidal Field (TF) coils, Poloidal Field (PF) coils, First Wall and Blanket design, and remote maintenance.

We describe the implementation of parametric design workflow for a conventional EU-DEMO-like tokamak, detailing the various design stages and the optimisation problems solved for common tokamak design issues. We present indicative results, highlighting differences in results between PROCESS and BLUEMIRA.