Fourth-generation reactors and nuclear-waste recycling
Current once-through nuclear power reactors use only 1% of the potential energy available in uranium, leaving the rest radioactively contaminated as nuclear “waste”. While the technical challenge of geological disposal is manageable, the political challenge of nuclear waste seriously limits the appeal of this zero-carbon and highly scalable energy technology. Spent-fuel recycling and breeding uranium-238 into new fissile material – known as Nuclear 2.0 – would extend already-mined uranium resources for centuries while dramatically reducing the volume and long-term toxicity of wastes, whose radioactivity will drop below the level of the original uranium ore on a timescale of centuries rather millennia. This makes geological disposal much less of a challenge (and arguably even unnecessary) and nuclear waste a minor environmental issue compared to hazardous wastes produced by other industries. Fourth-generation technologies, including liquid metal-cooled fast reactors, are now being deployed in several countries and are offered by established nuclear engineering companies.
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