As far as possible, you don't put complex electronics in there. Motors connected by an umbilical cable to the operator, analogue sensors, etc. In some situations you might be able to use a mechanical or hydraulic system.
"Most nuclear robots operate on power provided by a trailing umbilical. This means there are no batteries to change and no refuelling issues to contend with."
It's reasonably rare to have full or even semi-autonomous in nuclear due to the risks involved of something going wrong, or the thing just dying. Easier just to remote control down a cable.
See: https://www.bbc.co.uk/news/technology-20678838
"Most nuclear robots operate on power provided by a trailing umbilical. This means there are no batteries to change and no refuelling issues to contend with."
It's reasonably rare to have full or even semi-autonomous in nuclear due to the risks involved of something going wrong, or the thing just dying. Easier just to remote control down a cable.
See also https://www.emeraldinsight.com/doi/full/10.1108/014399112112... for an interesting overview of robots used at Fukushima.