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Nuclear fusion reactors do not exist yet as we don't know how to build them. All nuclear reactors are nuclear fission reactors.
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Nuclear reactor
nuclear fission
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Nuclear Fission
You have to build a nuclear reactor which is an assembly of nuclear fuel and a moderator, which enables a chain fission reaction to start and continue, which releases thermal energy.
The fission happens in the fuel, which is usually in fuel rods inside the reactor. The rods are spaced at a particular distance apart and fill the reactor.
Nuclear fission occurs in fission reactors, a type of nuclear reactor, and in fission bombs, more commonly knows as atomic bombs.
Produce heat (energy) from nuclear fission.
That released by fission in a nuclear reactor
That released by fission in a nuclear reactor