Pre-conceptual design study of remote handling compatible attachment mechanisms for in-vessel components in DEMO tokamak

• Investigated remote handling attachment mechanisms for DEMO blanket modules. • Proposed a hook-based fixture reducing reliance on precise robotic alignment. • Evaluated cross-sectional reduction and impact on structural integrity. • Considered alternative actuation methods to improve reliability in a fusion environment. • Outlined future steps, including FEM validation and seismic analysis. Large port-based tokamaks will comprise several maintainable items inside the Vacuum Vessel (VV) requiring periodic maintenance. Due to the levels of ionizing radiation, maintenance operations are expected to be carried out using Remote Maintenance (RM) machinery. Residual gamma radiation from previously activated components present a challenge for remote maintenance operations. It is therefore vital that in-vessel components are designed to be compatible with RM machinery. A key aspect to consider in the design of in-vessel components is how these will be attached to their load bearings inside the VV. The proposed attachment system is designed to facilitate RM operations by improving accessibility and modularity, reducing the complexity of alignment and handling processes. RM relevant design drivers for these attachment mechanisms are currently only understood at a high-level, an in-depth technology study is therefore needed. This paper presents the development efforts so far in identifying and developing these RM relevant design drivers in further detail. This study investigates alternative attachment mechanisms, drawing from various industries, and compares them with existing fusion reactor designs to assess feasibility. Additionally, this paper presents findings from studies performed within assumed representative contexts and resulting recommendations for in-vessel component designers developing attachment mechanisms.