5 billion years
When a Star runs out of fuel, it will expand into what is known as a "Red Giant". Massive stars will become "Red Supergiants". This phase will last until the star exhausts its remaining fuel. At this point, the pressure of the nuclear reaction is not strong enough to equalize the force of gravity and the star will collapse. Go to related link to read more about Stars... ;)
It will probably explode as a supernova, leaving either a neutron star or black hole.
When the sun exhausts the hydrogen in its core and become a red giant.
The main fuel for stars is hydrogen.
Most stars will become white dwarf stars. A "high mass" star will become a neutron star or a black hole, after exploding as a supernova.
This takes around 6.000.000 years but it could take longer depending on the amount of nuclear fuel spilt.
Nuclear fuel remains dangerously radioactive for thousands of years after it is no longer useful in a commercial reactor.
Nuclear fuel is the fuel used to produce nuclear energy.
The used fuel in a nuclear power plant is the nuclear fuel being discharged from the nuclear reactor after being irradiated during reactor operation. It is usually composed of trans-uranium heavy elements, a wide variety of fission products (that resulted from the nuclear fission processes in the nuclear reactor) and products of radioactive decay (produced before and after fuel discharge from the nuclear reactor).
As far as distance, nuclear powered submarines can go around the world four times on their nuclear fuel. As far as "before they need re-supply", I don't know but I am guessing it is a minimum of 40-60 days, maybe longer.
Zircaloy sheaths contain the fuel pins and remain throughout operation and subsequent storage of the spent fuel
Plutonium is used and also will be used in the future as fuel for nuclear power reactors.
Nuclear power is NOT a fossil fuel.
what possible future nuclear fuel
Uranium is a radioactive element used to fuel nuclear reactors. It is a nuclear fuel.
The population of Korea Nuclear Fuel is 696.
Korea Nuclear Fuel was created in 1982.