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From [URL="http://en.wikipedia.org/wiki/Nuclear_power"]here:[/url]
Uranium is a common element, occurring almost everywhere on land and in the oceans. It is about as common as tin, and 500 times more common than gold.
Generally, a nuclear power plant is significantly more expensive to build than an equivalent coal-fuelled or gas-fuelled plant. However, coal is significantly more expensive than nuclear fuel, and natural gas significantly more expensive than coal - thus, capital costs aside, natural gas-generated power is the most expensive.
So if it's the most common element, it doesn't matter if it's not renewable. By the time people use up all of it, they're bound to invent newer technologies.
It is dangerous, but that's a risk people take anyday anyways.
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