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How is fission possibly as clean as fusion? Fission leaves behind radioactive waste material; fusion leaves behind helium. This doesn't make any sense at all.

How is fission possibly as clean as fusion? Fission leaves behind radioactive waste material; fusion leaves behind helium. This doesn't make any sense at all. Yes, we can't do fusion in any practical manner at the moment, but we can't do fission scaled-down either: if you disagree, please show me an example which is economically successful. US Navy ships don't count (not "economically successful"). Someone actually tried building a fission-powered commercial cargo ship ages ago; it didn't last very long. It cost so much to operate that it was retired in a few years and sent to a museum in Charleston SC. With absurdly expensive fuel, nasty waste which needs to be disposed of somehow, and extremely dangerous operation requiring highly-trained personnel, fission plants only make commercial sense when they're scaled up to gigawatt scale power plants. Fusion plants may not be practical yet, but they'll never be practical if no effort is spent on R&D to make them that way.

evgen 10y ago
Neutron bombardment of your fusion containment vessel creates radioactive material. I am not sure where you get this idea that fusion is 'clean', but everything that involves pushing around fundamental particles creates radioactive waste. There are theoretical designs for fusion reactors that limit the radioactive side-effects somewhat but nothing in this area is clean. Scaled down fission reactors like the Toshiba 4S can be sized to power an apartment building or city block. There are numerous micro reactor designs available and a variety of companies working to try to create a market for them. When it comes to terrestrial reactors then fusion reactors will be enormous (need to generate a lot of power to compensate for the huge risk and the massive costs that it will take to build them) and if you are talking about putting reactors in space then it is foolish to consider anything but fission for at least our lifetime.

evgen 10y ago

Neutron bombardment of your fusion containment vessel creates radioactive material. I am not sure where you get this idea that fusion is 'clean', but everything that involves pushing around fundamental particles creates radioactive waste. There are theoretical designs for fusion reactors that limit the radioactive side-effects somewhat but nothing in this area is clean. Scaled down fission reactors like the Toshiba 4S can be sized to power an apartment building or city block. There are numerous micro reactor designs available and a variety of companies working to try to create a market for them. When it comes to terrestrial reactors then fusion reactors will be enormous (need to generate a lot of power to compensate for the huge risk and the massive costs that it will take to build them) and if you are talking about putting reactors in space then it is foolish to consider anything but fission for at least our lifetime.