No, they are stored in pools of water.
Nuclear power is NOT a fossil fuel.
Nuclear fuel has a higher energy density than fossil fuels.
A rod of uranium
What is the question?
Nuclear reactions do not produce gases, except for some of the fission products which are gaseous, like xenon, but these are contained securely within the fuel rods and would only be released in the event of a fuel melt down. So nuclear power does not produce greenhouse gases.
spent nuclear fuel
After the nuclear fuel is spent the fuel is radioactive. This radiation causes decay heat. The result of the radiation causes movement of atoms, converting it into thermal energy.
Irradiation of uranium in nuclear reactors, separation from the spent nuclear fuel, refining
Thousands of years at least
It is highly radioactive (that is the waste contained in the spent fuel)
This takes around 6.000.000 years but it could take longer depending on the amount of nuclear fuel spilt.
Heat, radiation, and spent fuel.
Yes there certainly is, both in the fission process and in the spent fuel when it is unloaded.
This question is not very simple. Uranium used as fuel in nuclear reactors is not all burned completely when it is no longer usable. The rest of uranium can by recycled, but spent fuel processing is extremely difficult and dangerous. Expended fuel is sitting around by the railroad car full for one reason: it is uniformly radioactive, and very highly so. Opening up spent fuel is not for the foolish or the untrained and unequipped. The hazards far outweigh the advantages, and it is far, far "easier" to store spent fuel than to do anything else with it. And that is why spent nuclear fuel storage is an issue now; reprocessing it is almost unspeakably "dirty" work.
The amount of plutonium in the nuclear waste depends on the type of waste and its origin. If by waste, it is meant the spent nuclear fuel discharged from reactor after irradiation, then the plutonium amount depends mainly on the nuclear fuel initial enrichment, the neutron irradiation flux, and the time of irradiation.In usually operated nuclear power reactors of light water reactors, the discharged spent fuel contains roughly 1 kg plutonium per ton of fuel.
Zircaloy sheaths contain the fuel pins and remain throughout operation and subsequent storage of the spent fuel
If you mean in the US, it is Yucca Mountain, Nevada