Fission and fusion
nuclear power
fission nuclear energyfusion nuclear energyradioactive decay
Nuclear fusion and nuclear fission are processes that involve nuclear reactions but are not examples of radioactive decay. Chemical reactions, such as burning wood, do not involve nuclear processes and are also not examples of radioactive decay.
Carnage
Two examples of nuclear fuels are uranium-235 and plutonium-239. These are commonly used in nuclear reactors to generate electricity through controlled nuclear fission reactions.
Radioactive fallout
Nuclear bombs, nuclear power plants, the sun.
Nuclear weapons are weapons which are fueled by nuclear energy. Examples of weapons that can be fueled by nuclear energy are missile warheads and bombs.
Uranium is used as nuclear fuel in nuclear power reactors.
The blast effects (which is all the question as worded asks about) would be the same as the blast effects of a weight of TNT identical to the nuclear bomb's yield (by definition). However a nuclear bomb has additional effects that the TNT doesn't, but as this question only asked about blast effects, I won't visit them.
Nuclear has radiation. But when used correctly there are no dangerous effects if you are using the proper precautions.
mutants