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Nuclear Power has absurdly remarketed itself as 'clean' energy, on the basis that carbon dioxide is a dirty pollutant responsible for etc. etc.
However, the process of preparing fuel for nuclear power statons requires a great deal of energy, and that energy of generates carbon dioxide. Uranium fuel for nuclear reactors is mined (e.g. in Australia and Canada, Niger and Namibia and the former Soviet Union), and the ore contains only a very small fraction of uranium. (Low-grade uranium ore mined in 2006 contained only 0.01 to 0.25% uranium oxides. 1. The mines themselves contain toxic materials and radioactive radon gas. Extracting and purifying the uranium is a dirty process, implicated both in depleting and contaminating water resources. Then the natural concentration of uranium-235, which is only 0.7%, must be increased. This enrichment process is very difficult, because uranium-235 and 238 are essentially identical chemically. The original gaseous diffusion method uses huge amounts of energy, but it is gradually being replaced by the use of large numbers of sophisticated gas centrifuges, which use only about 2.5% as much energy. After some enrichment, typically to 3–5% uranium-235, the uranium can be used to fuel reactors.
- 1source: Modern nuclear chemistry by Walter D. Loveland,David J. Morrissey,Glenn Theodore Seaborg


