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Small nuclear reactors will bleed us dry and won’t solve climate change – unfounded promises

there is every reason to believe that if and when a NuScale SMR is built, its final cost too will vastly exceed current official estimates. 

Unfounded promises — Beyond Nuclear International Small Modular Reactors epitomize culture that embraces exaggeration
By M.V. Ramana
In 2006, Elizabeth Holmes, founder of a Silicon Valley startup company called Theranos, was featured in Inc magazine’s annual list of 30 under 30 entrepreneurs. Her entrepreneurship involved blood, or more precisely, testing blood. Instead of the usual vials of blood, Holmes claimed to be able to obtain precise results about the health of patients using a very small sample of blood drawn from just a pinprick. 

The promise was enticing and Holmes had a great run for a decade. She was supported by a bevy of celebrities and powerful individuals, including former U.S. secretaries of state Henry Kissinger and George Shultz, James Mattis, who later served as U.S. secretary of defense, and media mogul Rupert Murdoch. Not that any of them would be expected to know much about medical science or blood testing. But all that public endorsement helped. As did savvy marketing by Holmes. Theranos raised over $700 million from investors, and receive a market valuation of nearly $9 billion by 2014

The downfall started the following year, when the Wall Street Journal exposed that Theranos was actually using standard blood tests behind the scenes because its technology did not really work. In January 2022, Holmes was found guilty of defrauding investors.

The second part of the Theranos story is an exception. In a culture which praises a strategy of routine exaggeration, encapsulated by the slogan “fake it till you make it”, it is rare for a tech CEO being found guilty of making false promises. But the first part of Theranos story—hype, advertisement, and belief in impossible promises—is very much the norm, and not just in the case of companies involved in the health care industry. 

Small Modular Nuclear Reactors

Nuclear power offers a great example. In 2003, an important study produced by nuclear advocates at the Massachusetts Institute of Technology identified costs, safety, proliferation and waste as the four “unresolved problems” with nuclear power. Not surprisingly, then, companies trying to sell new reactor designs claim that their product will be cheaper, will produce less—or  no—radioactive waste, be immune to accidents, and not contribute to nuclear proliferation. These tantalizing promises are the equivalent of testing blood with a pin prick. 

And, as was the case with Theranos, many such companies have been backed up by wealthy investors and influential spokespeople, who have typically had as much to do with nuclear power as Kissinger had to with testing blood. Examples include Peter Thiel, the Silicon Valley investor; Stephen Harper, the former Prime Minister of Canada; and  Richard Branson, the founder of the Virgin group. But just as the Theranos product did not do what Elizabeth Holmes and her backers were claiming, new nuclear reactor designs will not solve the multiple challenges faced by nuclear power.

One class of nuclear reactors that have been extensively promoted in this vein during the last decade are Small Modular Reactors (SMRs). The promotion has been productive for these companies, especially in Canada. Some of these companies have received large amounts of funding from the national and provincial governments. This includes Terrestrial Energy that received CAD 20 million and Moltex that received CAD 50.5 million, both from the Federal Government. The province of New Brunswick added to these by awarding CAD 5 million to Moltex and CAD 25 million in all to ARC-100

All these companies have made various claims about the above mentioned problems. Moltex, for example, claims that its reactor design “reduces waste”, a claim also made by ARC-100. ARC-100 also claims to be inherently safe, while Terrestrial claims to be cost-competive. Both Terrestrial and ARC-100 claim to do well on proliferation resistance. In general, no design will admit to failing on any of these challenges. 

Dealing with any of these challenges—safety enhancement, proliferation resistance, decreased generation of waste, and cost reduction—will have to be reflected in the technical design of the nuclear reactor. The problem is that each of these goals will drive the requirements on the reactor design in different, sometimes opposing, directions.


The hardest challenge is economics. Nuclear energy is an expensive way to generate electricity. In the 2021 edition of its annual cost report, Lazard, the Wall Street firm, estimated that the levelized cost of electricity from new nuclear plants will be between $131 and $204 per megawatt hour; in contrast, newly constructed utility-scale solar and wind plants produce electricity at somewhere between $26 and $50 per megawatt hour according to Lazard. The gap between nuclear power and renewables is large, and is growing larger. While nuclear costs have increased with time, the levelized cost of electricity for solar and wind have declined rapidly, and this is expected to continue over the coming decades

Even operating costs for nuclear power plants are high and many reactors have been shut down because they are unprofitable. In 2018, NextEra, a large electric utility company in the United States, decided to shut down the Duane Arnold nuclear reactor, because it estimated that replacing nuclear with wind power will “save customers nearly $300 million in energy costs, on a net present value basis.” 

The high cost of constructing and operating nuclear plants is a key driver of the decline of nuclear power around the world. In 1996, nuclear energy’s share of global commercial gross electricity generation peaked at 17.5 percent. By 2020, that had fallen to 10.1 percent, a 40 percent decline. 

The high costs described above are for large nuclear power plants. SMRs, as the name suggests, produce relatively small amounts of electricity in comparison. Economically, this is a disadvantage. When the power output of the reactor decreases, it generates less revenue for the owning utility, but the cost of constructing the reactor is not proportionately smaller. SMRs will, therefore, cost more than large reactors for each unit (megawatt) of generation capacity. This makes electricity from small reactors more expensive. This is why most of the early small reactors built in the United States shut down early: they just couldn’t compete economically.

SMR proponents argue that the lost economies of scale will be compensated by savings through mass manufacture in factories and as these plants are built in large numbers costs will go down. But this claim is not very tenable. Historically, in the United States and France, the countries with the highest number of nuclear plants, costs went up, not down, with experience. Further, to achieve such savings, these reactors have to be manufactured by the hundreds, if not the thousands, even under very optimistic assumptions about rates of learning. Finally, even if SMRs were to become comparable in cost per unit capacity of large nuclear reactors, that would not be sufficient to make them economically competitive, because their electricity production cost would still be far higher than solar and wind energy.

…………………………………………. Cost escalations are already apparent in the case of the NuScale SMR, arguably the design that is most developed in the West. The estimated cost of the Utah Association of Municipal Power Systems project went from approximately $3 billion in 2014 to $6.1 billion in 2020—this is to build twelve units of the NuScale SMR that were to generate 600 megawatts of power. The cost was so high that NuScale had to change its offering to a smaller number of units that produce only 462 megawatts, but at a cost of $5.32 billion. In other words, the cost per kilowatt of generation capacity is around $11,500 (US dollars). That figure is around 80 percent more than the per kilowatt cost of the infamous Vogtle project at the time its construction started. Since that initial estimate of $14 billion for the two AP1000 reactors, the estimated cost of the much delayed project has escalated beyond $30 billion. As with the AP1000 reactors, there is every reason to believe that if and when a NuScale SMR is built, its final cost too will vastly exceed current official estimates. ……………


The other promise made by SMR developers is how fast they can be deployed. GE-Hitachi, for example, claims that an SMR could be “complete as early as 2028” at the Darlington site.  ARC-100 described an operational date of 2029 as an “aggressive but achievable target”. 

Again, the historical record suggests otherwise. Consider NuScale. In 2008, the company projected that “a NuScale plant could be producing electricity by 2015-16”. As of 2022, the company projects 2029-30 as the date for start of generation. Russia’s KLT-40S, a reactor deployed on a barge, offers another example. When construction started in 2007, the reactor was projected to start operations in October 2010. It was actually commissioned a whole decade later, in May 2020. 

The SMR designs being considered in Canada are even further off. In December 2021, Ontario Power Generation chose the BWRX-300 for the Darlington site. That design is based on GE-Hitachi’s Economical Simplified Boiling Water Reactor (ESBWR) design, which was submitted for licensing to the U.S. Nuclear Regulatory Commission in 2005. That ESBWR design was changed nine times; the NRC finally approved revision 10 from 2014. If the Canadian Nuclear Safety Commission does its due diligence, it might be 2030 or later before the BWRX-300 is even licensed for construction. That assumes that the BWRX-300 design remains unchanged. And, then, of course, there will be the inevitable delays (and cost escalations) during construction. ………….

Waste, Proliferation and Safety

Small reactors also cause all of the usual problems: the risk of severe accidents, the production of radioactive waste, and the potential for nuclear weapons proliferation. …………

……………  small modular reactor proposals often envision building multiple reactors at a site. The aim is to lower costs by taking advantage of common infrastructure elements. The configuration offered by NuScale, for example, has twelve reactor modules at each site, although it also offers four- and six-unit versions. With multiple reactors, the combined radioactive inventories might be comparable to that of a large reactor. Multiple reactors at a site increase the risk that an accident at one unit might either induce accidents at other reactors or make it harder to take preventive actions at others. This is especially the case if the underlying reason for the accident is a common one that affects all of the reactors, such as an earthquake. In the case of the accidents at Japan’s Fukushima Daiichi plant, explosions at one reactor damaged the spent fuel pool in a co-located reactor. Radiation leaks from one unit made it difficult for emergency workers to approach the other units. ……………………………

Claims by SMR proponents about not producing waste are not credible, especially if waste is understood not as one kind of material but a number of different streams. A recent paper in the Proceedings of the National Academy of Sciences examined three specific SMR designs and calculates that “relative to a gigawatt-scale PWR” these three will produce up to 5.5 times more spent fuel, 30 times more long-lived low and intermediate level waste, and 35 times more short-lived low and intermediate level waste. In other words, in comparison with large light water reactors, SMRs produce more, not less, waste per unit of electricity generated. As Paul Dorfman from the University of Sussex commented, “compared with existing conventional reactors, SMRs would increase the volume and complexity of the nuclear waste problem”.

Further, some of the SMR designs involve the use of materials that are corrosive and/or pyrophoric. Dealing with these forms is more complicated. For example, the ARC-100 design will use sodium that cannot be disposed of in geological repositories without extensive processing. Such processing has never been carried out at scale. The difference in chemical properties mean that the methods developed for dealing with waste from CANDU reactors will not work as such for these wastes.

Many SMR designs also make the problem of proliferation worse. Unlike the CANDU reactor design that uses natural uranium, many SMR designs use fuel forms that require either enriched uranium or plutonium. Either plutonium or uranium that is highly enriched in the uranium-235 isotope can be used to make nuclear weapons. Because uranium enrichment facilities can be reconfigured to alter enrichment levels, it is possible for a uranium enrichment facility designed to produce fuel for a reactor to be reconfigured to produce fuel for a bomb. All else being equal, nuclear reactor designs that require fuel with higher levels of uranium enrichment pose a greater proliferation risk—this is the reason for the international effort to convert highly enriched uranium fueled research reactors to low enriched uranium fuel or shutting them down.

Plutonium is created in all nuclear power plants that use uranium fuel, but it is produced alongside intensely radioactive fission products. Practically any mixture of plutonium isotopes could be used for making weapons. Using the plutonium either to fabricate nuclear fuel or to make nuclear weapons, require the “reprocessing” of the spent fuel. Canada has not reprocessed its power reactor spent fuel, but some SMR designs, such as the Moltex design, propose to “recycle” CANDU spent fuel. Last year, nine US nonproliferation experts wrote to Prime Minister Justin Trudeau expressing serious concerns “about the technology Moltex proposes to use.” 

The proliferation problem is made worse by SMRs in many ways. ……………………..


The saga of Theranos should remind us to be skeptical of unfounded promises. Such promises are the fuel that drive the current interest in small modular nuclear reactors………

Rather than seeing the writing on the wall, unfortunately, government agencies are wasting money on funding small modular reactor proposals. Worse, they seek to justify such funding by repeating the tall claims made by promoters of these technologies……

August 1, 2022 - Posted by | 2 WORLD, Reference, Small Modular Nuclear Reactors

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