I think you mean that nuclear power generators are required to take extremely expensive safety measures when they handle significant amounts of radioactive mate

I think you mean that nuclear power generators are required to take extremely expensive safety measures when they handle significant amounts of radioactive materials (several thick concrete walls around the nuclear material, regular thorough inspection of the walls, and so on and so forth). Planes are not required to do that. However, it's a bit unfair, because the safety regulations for radioactive materials prohibit air transport of such amounts. You're saying that "handle with extreme care" is a higher safety standard than "doing that is forbidden".