South Korea is betting big on small modular reactors (SMRs) to power the next generation of cargo ships, combining artificial intelligence with nuclear technology to solve a critical maritime challenge. The government and major shipbuilders like HD Korea Shipbuilding and Hanwha Ocean are collaborating to develop vessels powered by reactors of 300 megawatts or less, replacing traditional liquefied natural gas engines. The initiative aims to deliver a basic design for marine molten salt reactors by 2029 and begin building commercial SMR ships in 2035, with full commercialization expected in the 2040s.

Why Are Nuclear-Powered Ships Suddenly a Priority?

The International Maritime Organization has set a hard deadline: achieve carbon neutrality across global shipping by 2050. This isn't optional anymore. Ships powered by SMRs offer significant advantages over conventional vessels. Because they don't require separate fuel tanks or exhaust pipes, they can carry more cargo. Their compact reactors can operate continuously for 10 to 20 years before needing replacement, improving both transport efficiency and operating costs. The global SMR market is projected to grow from approximately $7.05 billion in 2025 to $14.9 billion by 2034, according to market research firm Precedence Research.

South Korea isn't alone in this race. China, Japan, and Europe have already begun securing SMR technologies for maritime use. The competitive pressure is real, and South Korea's government has responded by making SMR ship development one of 12 priority tasks under the K-Moonshot Project, which combines artificial intelligence with science and technology to tackle major national challenges.

How Is AI Accelerating Nuclear Ship Development?

• Virtual Reactor Testing: AI-based virtual reactor platforms will verify safety and performance before physical construction, dramatically reducing development timelines and regulatory approval periods.
• Design Optimization: Artificial intelligence tools help engineers optimize molten salt reactor designs specifically for marine environments, where compact size, safety, and long-term continuous operation are critical requirements.
• Regulatory Streamlining: AI-powered analysis supports faster licensing and approval processes by providing comprehensive safety verification data upfront, addressing one of the biggest bottlenecks in nuclear technology deployment.

During a meeting at the Korea Atomic Energy Research Institute, Deputy Prime Minister Bae Kyung-hoon emphasized the government's commitment to using AI to accelerate development. "A phased transition to eco-friendly ships is needed by 2050," he stated. "The government is pursuing expanded SMR investment centered on K-Moonshot. To speed development, we will actively address the issue of shortening licensing and approval periods for related technologies, along with building virtual nuclear power plants through AI".

Research Institute, Deputy Prime Minister Bae Kyung-hoon

Participants at the meeting called for using AI-based virtual reactor platforms to verify safety in advance, effectively compressing years of traditional testing into months of computational analysis. This approach could be transformative for the entire SMR industry, not just maritime applications.

What's Driving the Global SMR Investment Boom?

South Korea's push into nuclear-powered ships reflects a broader global trend. The U.S. small modular reactor company X-energy, backed by the Department of Energy, has secured a business pipeline of 11 gigawatts through partnerships with Amazon, Dow, and Centrica. The company's stock surged after its Nasdaq listing, and its valuation has attracted significant international investment. South Korean construction firm DL E&C's stake in X-energy has jumped nearly sixfold in just three years, from $20 million in January 2023 to approximately $125 million as of April 2026, reflecting growing confidence in SMR technology.

Britain's National Nuclear Laboratory has projected the global SMR market could reach approximately $500 billion by 2035, making this a multi-hundred-billion-dollar opportunity. DL E&C recently signed a $10 million standardization design contract with X-energy, marking the first time a Korean construction company has directly received payment from an SMR developer for such work. This signals that Korean firms are moving beyond investment to become active participants in the global SMR supply chain.

What Role Is Nuclear Playing in the AI Energy Crisis?

The surge in nuclear investment isn't driven by shipping alone. The U.S. Department of Energy's fiscal year 2027 budget hearings revealed that grid reliability and dispatchable power have become central priorities, largely due to surging electricity demand from artificial intelligence and data centers. Secretary Chris Wright emphasized that the Biden Administration's focus on intermittent wind and solar energy sources had created grid vulnerabilities.

The Trump Administration's FY 2027 budget request allocates $3.5 billion to a new "Baseload Power" section that funds nuclear power activities alongside coal, oil, gas, geothermal, hydropower, and grid cybersecurity initiatives. This represents a significant reallocation of unobligated Infrastructure Investment and Jobs Act funding. Nuclear energy drew broad bipartisan support in congressional hearings, with members across both parties expressing backing for advanced reactors, SMRs, nuclear fuel cycle development, and domestic supply chains.

The convergence of maritime decarbonization goals and AI-driven electricity demand has created a unique moment for nuclear technology. South Korea's SMR ship initiative demonstrates how these two forces can align to drive innovation in unexpected sectors. By the 2040s, cargo vessels powered by molten salt reactors could be as common as diesel ships are today, fundamentally reshaping both maritime commerce and global energy infrastructure.