Small Modular Reactors

Small Modular Reactors: Wales/UK PowerPoint, 21 March 2022

Institute for Energy Economics and Financial Analysis, Feb. 2022, ‘NuScale’s Small Modular Reactor: Risks of Rising Costs, Likely Delays, and Increasing Competition Cast Doubt on Long-Running Development Effort‘. Too late, too expensive, too risky and too uncertain.

M.V. Ramana, 2020, ‘Eyes Wide Shut: Problems with the Utah Associated Municipal Power Systems Proposal to Construct NuScale Small Modular Nuclear Reactors‘.

Small Modular Reactors, 2021 briefing paper by Friends of the Earth Australia

Small nuclear reactors, huge costs, Oct. 2021 article in RenewEconomy

Exposing ‘small modular reactor’ economic misinformation from Ben Heard and other nuclear lobbyists (June 2020 article in RenewEconomy)

Small modular reactors and the nuclear culture wars, Aug 2019 article in RenewEconomy

Sept. 2019 – Australian environment groups’ submission to federal nuclear power inquiry (lots on nuclear economics, ‘generation IV’ concepts, small modular reactors etc).

Aug. 2019 – 65-page Friends of the Earth submission to federal nuclear inquiry, specifcally on ‘small modular reactors’

2019 Nuclear Monitor feature on SMRs:

Small modular reactors: an introduction and an obituary ‒ Small reactors: past and present ‒ Why the hype? ‒ Skepticism ‒ The SMR ‘hype cycle’ ‒ An obituary

The forgotten history of small nuclear reactors

SMR economics: an overview ‒ Fundamental problems ‒ Market size ‒ Costs per MWh ‒ Learning curve ‒ SMRs as ‘affordable luxuries’, diseconomies of scale ‒ Standardized modular rhetoric

SMR cost estimates, and costs of SMRs under construction

No-one wants to pay for SMRs: US and UK case studies

Are thousands of new nuclear generators in Canada’s future?

Small modular reactors and nuclear weapons proliferation ‒ Power/weapons connections ‒ The military origins of SMR programs ‒ Small reactors and proliferation ‒ SMRs as the proliferator’s technology of choice ‒ The proliferation risks associated with different SMR designs ‒ Uranium enrichment ‒ Plutonium reactors ‒ Safeguards and security

A military bromance: SMRs to support and cross-subsidize the UK nuclear weapons program

SMRs to power military installations and forward bases in the United States

SMR safety issues

Generation IV nuclear waste claims debunked

mPower: an obituary

High-temperature, gas-cooled zombie SMRs

The future of nuclear power in the US is bleak

M.V. Ramana, 23 June 2018

Presumably as a way to fulfill election promises, President Trump has ordered the use of emergency federal powers designed for war-time crises to financially prop up coal and nuclear power plants.

Nuclear power that was once advertised as being “too cheap to meter” has evidently become too costly for electric utilities to buy. Apart from two 1,000 megawatt reactors being constructed in Georgia at enormous expense to ratepayers (even after subsidies from tax payers), there are no immediate prospects for new nuclear power plants in the United States. What of the longer-term future?

One possibility for new nuclear reactor construction comes from what are called the Small Modular Reactors (SMRs). One SMR design called NuScale is slowly making its way to potential construction. Developed by a company based in Oregon, a single NuScale reactor is designed to generate just 50 megawatts of power.

Earlier this spring, the NuScale design cleared the first phase of the Nuclear Regulatory Commission’s certification process. A group of electrical utilities called the Utah Associated Municipal Power Systems has expressed an interest in purchasing a power plant, which consists of 12 NuScale reactors. The Tennessee Valley Authority also has applied for a permit to develop a site that could host an SMR.

Why SMRs? According to promoters of these scaled-down reactors, they could solve the multiple challenges faced by nuclear power. SMR developers promise lowered costs, decreased production of radioactive waste, reduction or even elimination of the risk of severe accidents, and no contribution to nuclear proliferation. Dozens of companies claim to be developing their own SMR designs, and many have received funding from wealthy private investors and the U.S. Department of Energy.

However, there is little to suggest SMRs will somehow magically remedy all that ails the nuclear industry. SMRs, as the name suggests, produce relatively small amounts of electricity in comparison with currently operational reactors. This puts them at a disadvantage.

One known way to reduce the cost of nuclear electricity has been to build larger reactors because the expenses associated with constructing and operating a reactor do not increase in direct proportion to the power generated. SMRs will, therefore, cost more than large reactors for each unit of generation capacity. Most of the small reactors built in the United States shut down early because they couldn’t compete economically.

SMR proponents argue that they can compensate by savings through mass manufacture in factories and learning how to hold down costs from the experience of constructing lots of reactors. This is a dubious assumption: In both the United States and France, the two countries with the highest numbers of nuclear plants, costs went up, not down, with construction experience.

Even if one were to assume that such “learning” actually occurs, SMRs have to be manufactured by the thousands to achieve meaningful savings. There is simply no market for so many reactors.

Even Westinghouse, the company that has directly or indirectly designed the majority of the world’s nuclear reactors, has realized that there is no market. For a decade or more, Westinghouse pursued a SMR design. But, in 2014, the company abandoned that effort. Its CEO explained: “The problem I have with SMRs is not the technology, it’s not the deployment — it’s that there’s no customers.” Few or no customers means no one would, or should, want to build a factory to construct the modules constituting these SMRs.

What of the claims about safety and nuclear waste? The problem is that the technical demands posed by these different goals conflict with one another, forcing reactor designers to make impossible choices.

For example, safety can be improved by making reactors smaller. But, a smaller reactor, at least the water-cooled reactors that are most likely to be built earliest, will produce more, not less, nuclear waste per unit of electricity they generate because of lower efficiencies. With no long-term solution in sight for nuclear waste, accumulating more radioactive spent fuel aggravates the storage problem.

The poor economic outlook for SMRs also affects safety. Companies that market SMRs propose placing multiple reactors in close proximity to save on costs of associated infrastructure. But this would increase the risk of accidents or the impact of potential accidents on the surrounding population.

At Japan’s Fukushima nuclear complex, 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.

The future of nuclear power in the United States, and indeed in much of the world, is bleak. Small modular reactors will not change that prognosis. There is no point in wasting public money on promoting them.

V. Ramana is the Simons chairman in Disarmament, Global and Human Security at the School of Public Policy and Global Affairs, University of British Columbia and the author of “The Power of Promise: Examining Nuclear Energy in India.”

Small-is-beautiful nuclear rhetoric fading fast

Jim Green

Chain Reaction #122, Nov 2014,

There’s an Alice in Wonderland flavour to the nuclear power debate with lobbyists promoting all sorts of non-existent reactor types − an implicit acknowledgement that conventional uranium-fuelled reactors aren’t all they’re cracked up to be. Some favour non-existent Integral Fast Reactors, others favour non-existent Liquid Fluoride Thorium Reactors, others favour non-existent Pebble Bed Modular Reactors, others favour non-existent fusion reactors, and on it goes.

Two to three decades ago, the nuclear industry promised a new generation of gee-whiz ‘Generation IV’ reactors in two to three decades. That’s what they’re still saying now, and that’s what they’ll be saying two to three decades from now. The Generation IV International Forum website states: “It will take at least two or three decades before the deployment of commercial Gen IV systems. In the meantime, a number of prototypes will need to be built and operated. The Gen IV concepts currently under investigation are not all on the same timeline and some might not even reach the stage of commercial exploitation.”

Integral Fast Reactors

Integral Fast Reactors (IFRs) are a case in point. According to the lobbyists they are ready to roll, will be cheap to build and operate, couldn’t be used to feed WMD proliferation, etc.

The UK and US governments have been analysing the potential of IFRs. The UK government found that the facilities have not been industrially demonstrated; waste disposal issues remain unresolved and could be further complicated if it is deemed necessary to remove sodium from spent fuel to facilitate disposal; and little could be ascertained about cost since General Electric Hitachi refuses to release estimates of capital and operating costs, saying they are “commercially sensitive”.

The US government has considered the use of IFRs (which it calls Advanced Disposition Reactors − ADR) to manage US plutonium stockpiles and concluded that the ADR approach would be more than twice as expensive as all the other options under consideration; that it would take 18 years to construct an ADR and associated facilities; and that the ADR option is associated with “significant technical risk”.

Unsurprisingly, the IFR rhetoric doesn’t match the sober assessments of the UK and US governments. As nuclear engineer Dave Lochbaum from the Union of Concerned Scientists puts it: “The IFR looks good on paper. So good, in fact, that we should leave it on paper. For it only gets ugly in moving from blueprint to backyard.”

Small Modular Reactors

In any case, IFRs are yesterday’s news. Now it’s all about Small Modular Reactors (SMRs). The Energy Green Paper recently released by the Australian government is typical of the small-is-beautiful rhetoric: “The main development in technology since 2006 has been further work on Small Modular Reactors (SMRs). SMRs have the potential to be flexibly deployed, as they are a simpler ‘plug-in’ technology that does not require the same level of operating skills and access to water as traditional, large reactors.”

The rhetoric doesn’t match reality. Interest in SMRs is on the wane. Thus Thomas W. Overton, associate editor of POWER magazine, wrote in a recent article: “At the graveyard wherein resides the “nuclear renaissance” of the 2000s, a new occupant appears to be moving in: the small modular reactor (SMR). … Over the past year, the SMR industry has been bumping up against an uncomfortable and not-entirely-unpredictable problem: It appears that no one actually wants to buy one.”

Overton notes that in 2013, MidAmerican Energy scuttled plans to build an SMR-based plant in Iowa. This year, Babcock & Wilcox scaled back much of its SMR program and sacked 100 workers in its SMR division. Westinghouse has abandoned its SMR program.

Overton explains: “The problem has really been lurking in the idea behind SMRs all along. The reason conventional nuclear plants are built so large is the economies of scale: Big plants can produce power less expensively per kilowatt-hour than smaller ones. The SMR concept disdains those economies of scale in favor of others: large-scale standardized manufacturing that will churn out dozens, if not hundreds, of identical plants, each of which would ultimately produce cheaper kilowatt-hours than large one-off designs. It’s an attractive idea. But it’s also one that depends on someone building that massive supply chain, since none of it currently exists. … That money would presumably come from customer orders − if there were any. Unfortunately, the SMR “market” doesn’t exist in a vacuum. SMRs must compete with cheap natural gas, renewables that continue to decline in cost, and storage options that are rapidly becoming competitive. Worse, those options are available for delivery now, not at the end of a long, uncertain process that still lacks [US Nuclear Regulatory Commission] approval.”

Dr Mark Cooper, Senior Fellow for Economic Analysis at the Institute for Energy and the Environment, Vermont Law School, points to some economic constraints: “SMR technology will suffer disproportionately from material cost increases because they use more material per MW of capacity. Higher costs will result from: lost economies of scale; higher operating costs; and higher decommissioning costs. Cost estimates that assume quick design approval and deployment are certain to prove to be wildly optimistic.”

Westinghouse CEO Danny Roderick said in January: “The problem I have with SMRs is not the technology, it’s not the deployment − it’s that there’s no customers.” Westinghouse is looking to triple its decommissioning business. “We see this as a $1 billion-per-year business for us,” Roderick said. With the world’s fleet of mostly middle-aged reactors inexorably becoming a fleet of mostly ageing, decrepit reactors, Westinghouse is getting ahead of the game.

Academics M.V. Ramana and Zia Mian state in their detailed analysis of SMRs: “Proponents of the development and large scale deployment of small modular reactors suggest that this approach to nuclear power technology and fuel cycles can resolve the four key problems facing nuclear power today: costs, safety, waste, and proliferation. Nuclear developers and vendors seek to encode as many if not all of these priorities into the designs of their specific nuclear reactor. The technical reality, however, is that each of these priorities can drive the requirements on the reactor design in different, sometimes opposing, directions. Of the different major SMR designs under development, it seems none meets all four of these challenges simultaneously. In most, if not all designs, it is likely that addressing one of the four problems will involve choices that make one or more of the other problems worse.”

Likewise, Kennette Benedict, Executive Director of the Bulletin of the Atomic Scientists, states: “Small modular nuclear reactors may be attractive, but they will not, in themselves, offer satisfactory solutions to the most pressing problems of nuclear energy: high cost, safety, and weapons proliferation.”

The writing is on the wall

Some SMR R&D work continues but it all seems to be leading to the conclusions mentioned above. Argentina is ahead of the rest, with construction underway on a 27 MWe reactor − but the cost equates to an astronomical US$15.2 billion per 1000 MWe. Argentina’s expertise with reactor technology stems from its covert weapons program from the 1960s to the early 1980s.

And while the ‘small is beautiful’ approach is faltering, so too is the ‘bigger is better’ mantra. The  1,600 MW Olkiluoto-3 European Pressurized Reactor (EPR) under construction in Finland is nine years behind schedule (and counting) and US$6.9 billion over-budget (and counting). The UK is embarking on a hotly-contested plan to build two 1,600 MW EPRs at Hinkley Point with a capital cost of US$26 billion and mind-boggling public subsidies. Economic consulting firm Liberum Capital said Hinkley Point will be “both the most expensive power station in the world and also the plant with the longest construction period.”

Jim Green is the national nuclear campaigner with Friends of the Earth, Australia.