Strategic Collaboration Targets Next-Gen Marine Propulsion Systems
Swiss technology leader ABB has expanded its partnership with Swedish nuclear developer Blykalla to accelerate the deployment of small modular reactors (SMRs) in the maritime industry. This move reflects a growing trend where nuclear propulsion is re-emerging as a viable option for decarbonizing large commercial vessels.
From Grid to Sea: Expanding the Scope of SMR Integration
The two companies had already signed an MoU in late 2024 to co-develop Blykalla’s lead-cooled SMR, initially targeting Sweden’s national grid. Now, the updated agreement extends this collaboration into marine applications, where SMRs could redefine ship propulsion by replacing fossil fuels with low-carbon nuclear power.
The SEALER Reactor: Compact, Passive, and Marine-Ready
At the core of the project lies the Swedish Advanced Lead Reactor (SEALER)—a compact 55 MWe SMR engineered with passive safety features. Designed for minimal operator intervention, the SEALER reactor suits marine environments where automated, resilient systems are essential. It was one of three technologies highlighted in the NuProShip I study as suitable for deployment on large vessels.
ABB to Deliver Control Systems and Power Integration Expertise
ABB will contribute its deep expertise in industrial automation, power distribution, and marine control systems. The company will ensure seamless integration of SMRs into shipboard power architectures using its advanced electrification and automation technologies. This includes both hardware and software, such as PLCs, distributed control systems (DCS), and energy management platforms.
Regulatory Landscape Shifts in Favor of Nuclear Shipping
Support for maritime nuclear propulsion is growing among regulators. In June, the International Maritime Organization (IMO) convened at MSC 110 and backed revisions to the Code of Safety for Nuclear Merchant Ships. These updates aim to include small modular reactor technologies, which were not addressed when the original code was enacted.
Industry Leaders Embrace SMR-Powered Vessels
Beyond ABB and Blykalla, several global players are investing in nuclear-powered ship concepts:
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HD Hyundai and TerraPower unveiled a 15,000 TEU nuclear-powered container ship, approved in principle by ABS.
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Samsung Heavy Industries introduced a gas carrier design using molten salt reactor (MSR) technology.
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A consortium including CORE POWER, Athlos Energy, and ABS is exploring floating nuclear power plants for ports and inland operations.
These examples demonstrate growing confidence in nuclear automation technologies for shipping.
Small Reactors, Big Impact: A Look at Emerging Designs
In parallel with larger vessels, innovators are exploring micro modular reactors (MMRs) for smaller maritime assets. One such prototype—a 1 MWe MMR—is being developed to power a 73-meter amphibious emergency response vessel. These compact designs aim to bring nuclear-level reliability to mission-critical operations in isolated or extreme environments.
Commentary: Nuclear Propulsion and the Future of Automation at Sea
From an industrial automation perspective, SMR-powered vessels present unique opportunities. Automation platforms will need to handle safety-critical operations, real-time diagnostics, and energy optimization across hybrid nuclear-electric systems. Unlike conventional marine engines, SMRs require integrated digital control systems to manage thermal output, reactor safety, and load balancing. Companies like ABB are well-positioned to deliver this level of system intelligence and control.
Moreover, cybersecurity and fail-safe design will become central to SMR deployment, further reinforcing the demand for secure control systems and standards-compliant automation platforms.