I think SMRs are very different from RTG. SMR is an essentially a small and fairly complex reactor design, like a molten salt reactor. It heats water or other l

I think SMRs are very different from RTG. SMR is an essentially a small and fairly complex reactor design, like a molten salt reactor. It heats water or other liquid, turns it into steam, steam spins a turbine, just like a regular power plant. An RTG is just a hot piece of radioactive material surrounded by thermocouples that directly convert the heat into electricity.