Small Modular Reactors Explained: What They Are and Why Remote Regions Are Studying Them

Small modular reactors, or SMRs, are increasingly mentioned in discussions about energy security, decarbonization and supply for remote regions. This article explains what they are, where the technology stands, and what any region would need to consider before treating them as a real option.

What makes a reactor “small” and “modular”

The International Atomic Energy Agency (IAEA) describes SMRs as advanced nuclear reactors with a power capacity of up to about 300 megawatts electric (MWe) per unit, roughly a third of a typical conventional reactor or less. A sub-category, microreactors, typically produces up to about 10 MWe.

“Modular” refers to the idea that major components, or entire units, are manufactured in a factory and transported to the site, rather than built from scratch on location. In principle, this could shorten construction times, standardize quality and allow capacity to be added in steps as demand grows.

Features that draw attention

Smaller footprint, which may suit sites where a large plant would be impractical.
Passive safety systems in many designs, which rely on natural processes such as gravity and convection to cool the reactor without operator action or external power.
Long refuelling intervals in some designs, which matters where fuel logistics are difficult.
Firm, low-carbon output that does not depend on weather, complementing solar and wind.

Where the technology stands

Only a few SMR-type units are operating worldwide, and many designs remain at the design, licensing or demonstration stage. Several countries, including the United States, Canada, China and Russia, have projects at different stages, and national regulators are adapting their licensing frameworks to these designs.

The main open questions are well known: whether factory production will actually bring costs down, how long licensing will take in each country, how fuel will be supplied, and how spent fuel will be managed.

Why remote regions are studying them

Remote regions that depend on transported diesel face high costs, supply risk and emissions. Where electricity demand is significant and stable, for example around mining, industrial or port activity, a compact source of firm power is an attractive idea in principle. That is why SMRs and microreactors appear in research and planning discussions about isolated systems, including in Brazil.

What any region would need to answer first

Before an SMR could be considered a serious option anywhere, a long list of questions would need answers:

Regulation. Is there a licensing pathway for the chosen design in that country? In Brazil, nuclear activities are subject to the federal nuclear regulatory framework.
Demand. Is demand large and stable enough to justify the investment?
Costs and financing. What is the realistic cost per unit of electricity compared with hybrid renewable alternatives?
Fuel and waste. How will fuel be supplied, and how will spent fuel be stored and managed over the long term?
Skills and security. Who will operate the plant, and how will physical security and safeguards be ensured?
Public engagement. Have local communities, including Indigenous and traditional peoples where relevant, been properly consulted?

Conclusion

SMRs are a technology worth understanding. They are not yet a ready-made answer for remote regions, and comparing them fairly with other options requires careful, independent analysis. Public education and transparent research are the right starting points.

World Funding’s work on nuclear energy and SMRs is limited to research, exploration and public education. This article does not refer to any vendor, project or agreement.

Sources and further reading

This article is for general information and education. It is not legal, financial, investment or engineering advice.