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Nuclear Fission.
Generally Uranium, but some reactors use Plutonium nuclear fission.

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Q: An energy source that heats fuel rods is?
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What energy source heats fuel rods to create steam for electric generators is?

Nuclear energy from fission of U-235 and Pu-239


What energy source is used for nuclear fuel rods?

uranium. When water is heated, it causes a chain reaction that turns the uranium to plutonium.


What does nuclear energy heat?

Initially it heats the fuel rods which are encased in zircaloy tubes (in a PWR or BWR). The outer surfaces of the zircaloy tubes transfer the heat to the water coolant which is pumped past them


What does it mean to spend fuel?

Do you mean spent fuel? This term is used to describe fuel rods that have insufficient energy left.


What role do fuel rods play in generating energy?

Fuel rods are the nuclear fuel in a nuclear power plant. They are used to turn water to steam, which is then used to turn a turbine. They do not "generate energy", since energy cannot be created or destroyed (E=mc^2). They are used to generate electricity, or to convert nuclear energy to electric energy.


How do you convert nuclear to thermal energy?

This happens in the fuel rods, the energy released by nuclear fission appears initially as kinetic energy of the fission fragments, which is quickly turned into thermal energy as the fragments slow down and are stopped in the fuel. Thus the fuel rods heat up and transfer thermal energy to the coolant, which in most reactors is water but can be gas or liquid metal.


Why would people want to reprocess fuel rods from a nuclear power plant?

as it still has energy in it.


What are the effects on using nuclear energy in the environment?

Not so much using nuclear energy as much as it is the spent fuel rods that are discarded after they are depleted. A nuclear reactor uses Uranium fuel rods that are discarded when they are no longer useful. the problem is they are highly radioactive, which is quite bad for the environment. The radioactive fuel rods (if not handled properly) can poison the surrounding area with radiation killing wildlife, and pollutiing streams and rivers and soil.


What rods hold pellets of uranium?

Known as fuel rods, these are hollow metal rods that contain the uranium fuel for a nuclear reactor.


What rods housed within a nuclear reactor?

fuel rods and control rods


What happens to fuel rods that are used to create nuclear fission?

You have a misapprehension there, it is uranium oxide that is used in fuel rods, not fossil fuel


What does nuclear energy release?

It releases heat through absorption of the kinetic energy of the fragments of fission in the material of the fuel rods (talking of nuclear reactors, not weapons)