There are both controlled and uncontrolled fission reactions. The reactors in nuclear power plants and submarines make use of a controlled nuclear reaction. Nuclear weapons make use of an uncontrolled reaction.
I'm not certain what you mean by an uncontrolled nuclear reaction, or which nuclear reaction you are referring to. I'm going to assume you are referring to the fission reaction. In fission, certain radioactive elements (such as Uranium) are bombarded with neutrons. The targeted element splits (fissions) into smaller elements while also releasing some neutrons, which cause more fissions--a chain reaction. If this process is allowed to continue with no intervention, it is "uncontrolled." Controlling the reaction requires slowing and capturing some of the neutrons, such as is done in generating electricity using a nuclear reactor. This is a very simplified explanation, but I think it may suffice.
Have a look at some of the story of Chernobyl.
A reaction, as in fission, fusion, or radioactive decay, that alters the energy, composition, or structure of an atomic nucleus.
It is the kind of fission that occurs in nuclear fission bombs
Atomic fission bomb.
For fusion, the main disadvantage is that nobody has been able to make it work. However it does have promise and if it can be developed it will not produce the dangerous fission products that fission does. For fission, see reply to question 'What are the disadvantages of nuclear fission power'
nuclear fission
FISSION. nobody on this website knows the answer..... SHAME
Nuclear fission
nuclear fission is the process of splitting atoms.
Atomic fission bomb.
False, the fission in nuclear reactors is controlled with the movable control rods.
uncontrolled nuclear fission and/or fusion.
Yes, radioactive decay results in the release of nuclear energy. The radioactive decay of an atom is the result of changes in the atom's nucleus, so energy released will be nuclear energy by definition.
An uncontrolled release of nuclear binding energy. This can be either by fission or fusion or some mixture of both.
Nuclear bombs are done by an uncontrolled process of nuclear fission. This means that nukes probably contain Uranium 235 primarily.
You get nuclear fission in:nuclear fission reactorsatomic fission bombs
For fusion, the main disadvantage is that nobody has been able to make it work. However it does have promise and if it can be developed it will not produce the dangerous fission products that fission does. For fission, see reply to question 'What are the disadvantages of nuclear fission power'
nuclear fission
nuclear fission
Nuclear fission
FISSION. nobody on this website knows the answer..... SHAME