Building, and commercializing, a better nuclear reactor

A couple of years ago, I was transfixed by the research from Leslie Dewan and Mark Massie highlighted in their TedX video on the future of nuclear power.


A recent IEEE Spectrum article highlights what Dewan and Massie have been up to since then, which is founding a startup called Transatomic Power in partnership with investor Russ Wilcox. The description of the reactor from the article indicates its potential benefits:

The design they came up with is a variant on the molten salt reactors first demonstrated in the 1950s. This type of reactor uses fuel dissolved in a liquid salt at a temperature of around 650 °C instead of the solid fuel rods found in today’s conventional reactors. Improving on the 1950s design, Dewan and Massie’s reactor could run on spent nuclear fuel, thus reducing the industry’s nuclear waste problem. What’s more, Dewan says, their reactor would be “walk-away safe,” a key selling point in a post-Fukushima world. “If you don’t have electric power, or if you don’t have any operators on site, the reactor will just coast to a stop, and the salt will freeze solid in the course of a few hours,” she says.

The article goes on to discuss raising funds for lab experiments and a subsequent demonstration project, and it ends on a skeptical note, with an indication that existing industrial nuclear manufacturers in the US and Europe are unlikely to be interested in commercializing such an advanced reactor technology. Perhaps the best prospects for such a technology are in Asia.

Another thing I found striking in reading this article, and that I find in general when reading about advanced nuclear reactor technology, is how dismissive some people are of such innovation — why not go for thorium, or why even bother with this when the “real” answer is to harness solar power for nuclear fission? Such criticisms of innovations like this are misguided, and show a misunderstanding of both the economics of innovation and the process of innovation itself. One of the clear benefits of this innovation is its use of a known, proven reactor technology in a novel way and using spent fuel rod waste as fuel. This incremental “killing two birds with one stone” approach may be an economical approach to generating clean electricity, reducing waste, and filling a technology gap while more basic science research continues on other generation technologies.

Arguing that nuclear is a waste of time is the equivalent of a “swing for the fences” energy innovation strategy. Transatomic’s reactor represents a “get guys on base” energy innovation strategy. We certainly should do basic research and swing for the fences, but that’s no substitute for the incremental benefits of getting new technologies on base that create value in multiple energy and environmental dimensions.


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