Robots have not proven very successful in nuclear disasters IIRC. Radiation hardening for the computers is an issue, as are manipulators and other things. More

Robots have not proven very successful in nuclear disasters IIRC. Radiation hardening for the computers is an issue, as are manipulators and other things. Moreover, in a disaster situation like Fukushima, power loss would be an issue. Fukushima was fine in the immediate aftermath (24 hours?) of the disaster until the on-site batteries ran out and backup generators couldn’t start due to damage from flooding. A fully robotic installation would face similar and greater problems after a SCRAM. It’s an interesting sci-fi idea that might be possible in a hundred years, once we master simpler robots like vacuums and folding laundry!