Enthalpy
7th February 2008 - 02:16 AM
Hi Arthur and the others! It's been such a long time I didn't disagree with you!
Uranium cost recently 130$/lb = 260$/kg, from
http://de.wikipedia.org/wiki/UranI understand it as a price per metal weight of natural U.
Now, from 1kg U with 0,72% U235, we obtain 1.8e22 atoms of U235.
We use half of these atoms to obtain 200MeV from each, or 290GJ heat from 1kg.
Converting 30% heat to electricity, we obtain 24200 kWh.
The uranium cost is then 0.01$/kWh, which is still low.
BUT this means
we could barely afford it to be 10 times more expensive.
Wiki's article tells that known+supposed reserves at 130$/lb would last for only 70 years at today's consumption rate. This means nuclear energy can't replace other sources for every country - only France can produce all its electricity from uranium.
Allowing only a factor of 10 in the ore price, you won't get much more deposits than now.
And I don't want to have breeders. Less passive stability than other reactors. Worse, they would increase the amount of plutonium available everywhere to build bombs. Don't tell me about weapon-grade, it's been a nonsense for decades.