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The small format reactors are interesting, but I've yet to see really convincing working prototypes - has anyone else?
I thought the pebble bed reactor concept was interesting too.
As I understood it tho, uranium is the limiting factor for a nuclear electricity economy. There's enough uranium for a while, but of we wanted to produce planetary scale amounts of nuclear electricity the struggle for uranium would relatively quickly mirror the current competition for oil.
The proposed solution is a plutonium economy based on breeder reactors - and a plutonium economy has a lot of scary problems asscoiated with it.
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