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Mike Walsh, IMEG Senior Director of Industrial, joins this episode to discuss small modular reactors (SMRs) and their potential for becoming an integral source of power for manufacturers and industrial campuses.
SMRs typically produce 50 to 300 megawatts of power, unlike traditional nuclear plants that generate between 1,000 and 1,500 megawatts. Mike is quick to clarify, however, that the adjective “small” is relative in comparison to traditional reactors. “They’re not small—they’re just smaller,” he says of SMRs. “They’re still large, sophisticated facilities. But their modular construction changes everything.”
SMRs work on the same basic principle as traditional reactors: nuclear fission heats water into steam, which drives a turbine to produce electricity. Unlike traditional reactors, the reactor portion is manufactured within a factory—where conditions are controlled and quality assurance is consistent—and are then shipped to a location. They require significant real estate—typically 10 to 100 acres, but still far less than the 250 to 400 acres for a traditional nuclear plant.
Their smaller footprint makes SMRs particularly well suited for industrial campuses. And while roughly two-thirds of a traditional nuclear plant’s thermal energy is lost as waste heat, SMRs can capture and reuse that excess energy. “If we can use that heat for industrial processes or building systems, overall efficiency on an industrial site could reach 80 or 90 percent,” Mike says. The 24/7 on-site generation of power also will be highly beneficial to industries as the reliability and strain on the grid continue to worsen, energy costs rise, and owners begin to see high demand factors on utility bills.
With few new nuclear plants built in the U.S. since the 1970s, the path forward for SMRs is murky. “No one really knows yet how these will be regulated,” Mike says. “You can’t apply the same rules that were written for massive, one-of-a-kind nuclear facilities. This is new territory.”
Economics also is a factor. Early SMRs will be expensive, but Mike draws a parallel to renewable energy’s evolution. “Solar was once prohibitively costly too,” he says. “Then technology improved, production scaled, and prices fell. The same thing will happen here.”
The general perception of nuclear power will also need to be overcome. ”It's the not-in-my-backyard syndrome kind of thing,” Mike says. “There are reasons why nuclear accidents happened in the past, but it’s highly improbable that that would happen with these newer facilities and the way they have some passive ability, if they lost all power to the site, to still cool that reactor and not have a meltdown.
Despite the challenges, Mike believes nuclear power will be an essential part of a diversified energy mix of the future, which will also include wind, solar, hydro-electric, and, for some time at least, coal. “There are a lot of pieces of the puzzle for how we are going to create energy now and into the future.”
Several companies are now building various versions of SMRs. One of them, Kairos Power, is constructing a demonstration reactor in Tennessee; IMEG is collaborating with HDR on the project. The facility is expected to be online in 2027 and will provide essential data on performance, safety, and cost, laying the groundwork for future deployment.
Compared to traditional nuclear plants that take decades to bring online, Mike believes that the faster production and startup of SMRs will be key to addressing current and future energy needs. “SMRs are made to help with a problem we have right now, not a problem we're going to have in 30 years.”
