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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'
In nuclear reactors, to produce electricity
Nuclear fusion produce energy 400 times more than nuclear fission for the same mass.
The heat energy resulting from nuclear fission is used to produce steam that spins the turbine.
To sustain a fission chain reaction, each fission reaction must result in one more fission reaction. And that one should result in one more, and so on.
Nuclear fission
A stable nuclear fission reaction will be sustained if every fission produces one additional fission reaction.
All the nuclear fissions produce smaller elements from the larger element and few neutrons so that the fission reaction is continuously carried out.
A controlled nuclear chain reaction produces heat, driving steam turbines to produce energy.
We use nuclear fission in nuclear reactors to tap nuclear energy.
Nuclear fission does not produce more energy than nuclear fusion. In nuclear fusion (6.4 MeV) per nucleon is given out which is much greater than the energy given out per nucleon (1 MeV) during a nuclear fission reaction.
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'
In nuclear reactors, to produce electricity
The uranium 235 atoms in the nuclear fuel are what actually fission, or split into two other atoms. The uranium is in ceramic fuel pellets that are inserted into fuel rods, that make up fuel elements, that are in the reactor core that is located in the reactor vessel of the nuclear power plant. After the fuel has been in the reactor it begins to produce plutonium 239 atoms within the fuel which will also undergo a fission reaction.
Nuclear fission is nuclear reaction in which nucleus of an atom , usually a heavy element, splits into smaller parts i.e. lighter nuclei . Free neutrons and photons are produced along with release of large amount of energy.
Nuclear fusion produce energy 400 times more than nuclear fission for the same mass.
Nuclear fission. Larger atoms are broken into smaller parts and energy is released. Nuclear fusion is where lighter atoms are fused together - as happens in the sun. This also produce energy, though much more.