they have never built one
No place, we have not yet determined how to make a fusion reactor. Only fusion bombs.
yes. this is because nuclear power plants use nuclear fusion
We don't yet know how to use fusion in a power plant. All nuclear power plants use fission only. Fusion is much harder, but will be better if we can figure it out.
There is very little similarity between present day power plants which use nuclear fission, and any possible nuclear fusion plant of the future
nuclear fusion. This process releases large amounts of energy and is the primary source of power for the sun and other stars. It involves the merging of lighter atomic nuclei to form a heavier nucleus.
the sun is powered by fusion, the power plant by fission
No, because the highest amount of energy needed in a nuclear fusion is 40,000,000 K, which is only known to occur on the sun.
Nuclear Fusion
Combining two atomic nuclei is called nuclear fusion.
Fusion is a nuclear reaction.
The idea of nuclear fusion occurring at room temperature is called cold fusion.
Nuclear fusion produces nuclear energy