Nuclear power delivers consistent, low-carbon electricity, yet constructing conventional large-scale reactors often involves enormous financial investment and lengthy timelines—too slow to keep pace with rising demand for dependable, clean energy. A decade ago, a group of engineers at what is now GE Vernova Hitachi Nuclear Energy began tackling this challenge. Led by Christer Dahlgren and Brian Hunt, the team explored innovative reactor designs, culminating in a breakthrough idea from Dahlgren that would drastically streamline the architecture of a small modular reactor (SMR). Today, Dahlgren serves as technical lead for the inaugural deployment of the BWRX-300, a 300-megawatt reactor projected to supply carbon-free* power to approximately 300,000 homes upon its launch in 2030.

“It happened right here, in my workspace,” Dahlgren remembers, speaking from his office in Wilmington, North Carolina. “We asked ourselves, ‘What if we tried this?’ We sketched a vessel and a valve on a whiteboard. I wiped it clean and immediately began drafting a patent—with our co-inventor, Wayne Marquino. That moment was truly electrifying.”

Transforming a simple sketch into a viable, buildable design demanded determination. It took several years of intensive simulation and technical validation to persuade stakeholders inside and outside the company that the concept was not only safe but also a sound investment.

From Concept to Construction

Dahlgren, now a chief consulting engineer at GE Vernova Hitachi Nuclear Energy, was well-suited to lead the effort. Raised in Sweden, where nuclear power accounts for roughly 30% of national electricity, he wrote his master’s thesis on a 1969 flooding incident at a nuclear plant in Stockholm.

“The original reactor was still intact, so I could climb onto the vessel, measure components, and interview retired engineers who had access to old schematics and firsthand knowledge,” he explains.

His interest in nuclear engineering stemmed from a fascination with modeling the complex interaction of liquid water and steam within reactor systems. He also valued collaborating with experts across disciplines—materials science, hydraulics, chemistry, physics, electrical engineering, operations, and human-machine interaction. These early experiences reinforced his view that nuclear safety must be addressed holistically, as an integrated system.

“Every technical field comes into play,” he notes. “Bringing all these specialists together around one major objective is challenging—but that’s also what makes it so rewarding.”

Safety Through Simplicity

The SMR design developed by Dahlgren’s team emphasizes passive safety systems capable of managing reactivity and dissipating heat without relying on external power or continuous coolant supply. To ensure reliability, each safety function includes dual activation methods. In the event of an emergency, the reactor can remain in a safe condition for up to seven days without operator intervention or electrical input.

Small modular reactors offer significant advantages for utilities and consumers alike. Compared to traditional reactors, they are engineered for faster, more economical deployment. Their compact size allows easier integration into existing power grids and reduces the need for large backup power systems during outages.

“Nuclear generation produces massive output with minimal land use, unlike hydroelectric facilities, wind farms, or other low-carbon alternatives that require vast expanses of space,” Dahlgren points out.

From Vision to Reality

The initial whiteboard concept from Dahlgren’s workspace has evolved into a full-scale construction initiative now underway at the Darlington New Nuclear Project in Ontario, Canada—located about 40 miles east of Toronto. A cluster of cranes and a reactor shaft extending over 100 feet below ground mark a pivotal step in transitioning SMR technology from design and regulatory approval to physical implementation. This first of four planned units is expected to take roughly four years to complete, with significantly lower initial costs than conventional reactors and further savings through standardized, repeatable construction.

Dahlgren was recently awarded the 2026 Honorary Prize by the Swedish Nuclear Society in recognition of his contributions to nuclear innovation. He shares this distinction with a familiar face—physicist Mattias Lantz, his childhood friend, who received the same honor in 2025. In fact, Dahlgren learned of his award while vacationing in Scotland with Lantz.

Prior to construction starting at Darlington, Dahlgren collected a small rock from the site as a keepsake. He keeps it close as a physical connection to that original whiteboard sketch—a symbol of how far a single idea can go when backed by collective vision and commitment.

“When we began, only a handful of us were working on new nuclear projects,” he reflects. “Now, we’re hundreds strong. Creating a legacy—from a sketch on a whiteboard to a large, unified team focused on one mission—is what I hope to leave behind. The journey so far has been incredible. The next five to ten years? That’s going to be even more exciting.”

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