The Cowboy State is weighing plans to host a multi-billion dollar “demonstration” nuclear power plant — TerraPower’s Natrium reactor. The long history of similar nuclear reactors, dating back to 1951, indicates that Wyoming is likely to be left with a nuclear lemon on its hands.
The Natrium reactor design, which uses molten sodium as a coolant (water is used in most existing commercial nuclear reactors), is likely to be problematic. Sodium reacts violently with water and burns if exposed to air, a serious vulnerability. A sodium fire, within a few months of the reactor starting to generate power, led to Japan’s Monju demonstration reactor being shut down.
At 1,200 megawatts, the French Superphénix was the largest sodium-cooled reactor, designed to demonstrate commercial feasibility. Plagued by operational problems, including a major sodium leak, it was shut down in 1998 after 14 years, having operated at an average capacity of under 7 percent compared to the 80 to 90 percent required for commercial operation. Other sodium-cooled reactors have also experienced leaks, which are very difficult to prevent because of chemical interactions between sodium and the stainless steel used in various reactor components. Finally, sodium, being opaque, makes reactor maintenance and repairs notoriously difficult.
Sodium-cooled reactors can experience rapid and hard-to-control power surges. Under severe conditions, a runaway chain reaction can even result in an explosion. Such a runaway reaction was the central cause of the 1986 Chernobyl reactor explosion, though that was a reactor of a different design. Following Chernobyl, Germany’s Kalkar sodium-cooled reactor, about the same size as the proposed Natrium, was abandoned without ever being commissioned, though it was complete.
All these technical and safety challenges naturally drive up the costs of sodium-cooled reactors, making them significantly more expensive than conventional nuclear reactors. More than $100 billion, in today’s dollars, has been spent worldwide in the attempt to commercialize essentially this design and associated technologies, to no avail.
The Natrium design, being even more expensive than present-day reactors, will therefore be more expensive than practically every other form of electricity generation. The Wall Street firm, Lazard, estimates that electricity from new nuclear plants is several times more than the costs at utility-scale solar and wind power plants. Further, the difference has been increasing.
To this bleak picture, Terrapower has added another economically problematic feature: molten salt storage to allow its electric output to vary. Terrapower hopes this feature will help it integrate better into an electricity grid that has more variable electricity sources, notably wind and solar.
Molten salt storage would be novel in a nuclear reactor, but it is used in concentrating solar power projects, where it can cost an additional $2,000 per kilowatt of capacity. At that rate, it could add a billion dollars to the Natrium project.
This host of factors makes it reasonably certain that the Natrium will not be economically competitive. In other words, even if has no technical problems, it will be an economic lemon.
To top it all off, the proposed Wyoming TerraPower demonstration project depends on government funds. Last year, the Department of Energy awarded TerraPower $80 million in initial taxpayer funding; this may increase $1.6 billion over seven years, “subject to the availability of future appropriations” and Terrapower coming up with matching funds.
Despite government support, private capital has recently abandoned a more traditional project, the mPower small modular reactor, resulting in its termination in 2017. And it was Congress that refused to appropriate more money for the sodium-cooled reactor proposed for Clinch River, Tennessee when its costs skyrocketed, thereby ending the project in 1983.
A much harder look at the facts is in order, lest Wyoming add to the total of many cancelled nuclear projects and abandoned construction sites. Of course, the Natrium lemon might be made into lemonade by converting it to an amusement park if it is never switched on, like the Kalkar reactor, now refashioned into Wunderland Kalkar, an amusement park in Germany, near the border with the Netherlands. For energy, the state might look to its natural heritage – its wind power potential is greater than the combined generation of all 94 operating U.S. nuclear reactors put together, which are on average, about three times the size of Natrium.
M. V. Ramana is Professor and Simons Chair in Disarmament, Global and Human Security and the Director of the Liu Institute for Global Issues at the School of Public Policy and Global Affairs, University of British Columbia. Dr. Ramana holds a Ph.D. in Physics from Boston University.
Arjun Makhijani, President of the Institute for Energy and Environmental Research, holds a Ph.D. in engineering (nuclear fusion) from the University of California at Berkeley.
