remote handling is the robotic inspection, repair, and replacement of activated reactor components that humans cannot approach — the maintenance discipline on which a fusion power plant's availability depends.
Remote handling exists because of 📝neutron activation: once a machine has run on the 📝D-T reaction, its vessel interior and surrounding structures are radioactive enough that every subsequent maintenance task must be performed by machines — manipulators, transport casks, and purpose-built robots operated from shielded control rooms. It differs from ordinary industrial robotics in its constraints: the equipment must work in confined, radiation-hard environments, handle components from delicate diagnostics to assemblies weighing tens of tonnes, and succeed reliably, because no human can enter to recover from a failure.
The field's proving ground has been the 📝Tokamak line itself. The Joint European Torus demonstrated in 1998 that in-vessel components could be exchanged entirely remotely after its first D-T campaign, and ITER is designing dedicated remote handling systems for its blanket, 📝divertor, neutral beam, and cask logistics, sized for loads up to 45 tonnes. For commercial plants the discipline is economic as much as radiological: the time a robot needs to swap a worn component is plant downtime, so designing components for fast remote exchange — rather than retrofitting robots to a finished design — directly sets the capacity factor a fusion plant can achieve.