The radioactive waste remains HOT for a while after, not just in "rads", but in deg C, so why not use the heat from the decaying isotope in a Radio Thermal Generator and use the thermal energy given off by the nuclear waste.
A for blasting nukes into space, an incident like Challenger or Arianne 5 #1 would have chernobyl like concequences.
Hydro is also an option but though the use of water is clean, the back fill behind the dam usually means loss of habitats for man and animal kind, as well as trees as not every mountain is suitable for hollowing out and putting a llanberis-esqe power station in it.
Geo Thermal, yes viable if you live close to an active volcano or two, not so for the uk.
Solar yes if you are in the desert like nevada australia africa or middle east, when did you last see the sun in the uk?
Tidal, salt water corrosion isnt really an issue, so thats feasable, however a plan to barrarge morcame bay was blocked by the green movement!
So really in that respect nuclear is the best option, and reactors now are far more efficient than before, so can get more energy out of 1kg of uranium than older types.