The world needs abundant, carbon-free power, and advanced nuclear reactors for years have promised an attractive source of that, as well as a supplement to intermittent renewable energy from the sun and wind. So-called small modular reactors (SMRs), which can generate up to a third of the power of existing gigawatt-scale plants, are promoted as less expensive and cumbersome than conventional light-water reactors.
Regulatory and other barriers preventing their construction are substantial — and have eclipsed scrutiny of proponents’ claims about radioactive waste, according to new research published today in the journal Proceedings of the National Academy of Sciences. The authors cite one US report stating that highly radioactive wastes could fall 94% by mass and 80% in long-lived radioactivity with the switch to advanced reactors.
