The amount of energy obtained from nuclear fuel is expressed as so many megawattdays per tonne, in a liquid water reactor (LWR) it is now around 60,000 MWd/tonne. So if a reactor power output is say 3000 MW (thermal), in one day it will use up 1/20 tonne of fuel, and in a year it will use 18.25 tonne. With reactors that can be refuelled during operation, or during short shutdown periods, the individual fuel assemblies can be changed as required giving flexibility, this applies to the advanced gas-cooled reactors (AGR's) built in the UK. With LWR's where the top of the pressure vessel has to be removed for fuelling, this is only possible during long outages (though they have become much shorter with practice), and so a large proportion of the fuel is changed each time. When a reactor has settled into a routine of regular fuelling outages, this would probably be at about two yearly intervals, and about 1/3 of the fuel changed each time, so any particular assembly could stay in the reactor for about six years on average.
Well, all fuel rods are pretty much safe (although they emit small amounts of radiation on their own). It's the post-fission uranium/plutonium that is dangerous.
it takes about millions and millions of years to develope a nuclear power.
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The fuel cost is lower than for fossil fuel, so once the plant is built it tends to be run continuously on base load at full power, to take advantage of this. Taking the high building cost into account, there is probably not much difference overall between nuclear and fossil.
nuclear energy is produced by taking advantage of natural decay in large nuclei of atoms. atoms with large enough nuclei can only be produced by very large scale nuclear fusion such as stars during a supernova, and making it on earth would take enormous amounts of energy. So no, nuclear energy is not totally sustainable, but a small amount of fuel lasts a long time. For this reason energy can be stored by scientifically making large nuclei atoms and utilizing them later.
it may take up to 100 years for the explosion area to become livable once again
This takes around 6.000.000 years but it could take longer depending on the amount of nuclear fuel spilt.
1 billion years
We still not a nuclear country
Nuclear fall-out. It can take centuries for radiation to dissipate to a safe level.
it takes about millions and millions of years to develope a nuclear power.
nuclear fusion reaction
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You presumably mean the radiation from an exposed piece of nuclear fuel (used, not new), which will be so intense that it will kill a person with only a short exposure, though the radiation sickness will take a week or so to cause death.
I think they are still testing
Uranium is not a fossil fuel and cannot be a fossil fuel.