Enabling SMR deployment
Small modular reactors (SMRs) are widely positioned as a plug-and-play solution for the energy transition, promising scalability, reduced construction timelines and greater deployment flexibility. However, this perspective can overlook a critical aspect of implementation: the infrastructure systems that ultimately determine whether these reactors can operate safely and reliably over time
As SMRs move from concept to deployment, it is already clear that success will not be defined by reactor design alone, but by how well the surrounding systems perform under real-world conditions.
The promise and the assumption
The appeal of SMRs lies in their modularity. Factory-built components, standardised designs and repeatable installation processes are expected to reduce both cost and complexity. In theory, this enables faster rollout across multiple sites and regions.
However, this approach is built on an implicit assumption: that supporting infrastructure can be standardised to the same degree as the reactor itself. In practice, this assumption often breaks down.
Each installation environment introduces its own constraints, ranging from regulatory requirements to environmental conditions and spatial limitations. These factors place significant demands on how infrastructure systems are designed, integrated and verified in practice.
The overlooked layer
While reactor technology remains at the centre of industry discussions, less attention is given to the systems that ensure containment, separation and protection between different operational zones. This is rarely the focus of early design discussions. But it should be, in our view.
Cable and pipe penetrations, sealing systems and transit solutions may appear secondary in complexity, but they serve a fundamental role in maintaining the integrity of physical barriers. These interfaces must simultaneously prevent the spread of fire, gas and water, while also withstanding pressure differentials and mechanical stress over extended operational lifetimes.
In nuclear environments, seemingly minor interfaces can become critical points of failure if not engineered correctly. And when they fail, the consequences are rarely isolated; they tend to cascade. Despite this, they are often treated as standard components rather than as integral elements of the overall safety strategy.
New challenges introduced by SMR deployment
The shift towards smaller, more compact reactor units introduces new engineering realities. Increased system density leads to more complex routing of cables and services, which in turn raises the demands on sealing performance and installation accuracy.
At the same time, prefabrication and modular assembly reduce the margin for on-site adjustments. Infrastructure systems must therefore be designed for precision and repeatability from the outset. There is little room for improvisation once installation begins.
A further challenge comes from the ambition to deploy SMRs across diverse geographies. While standardisation remains a key objective, variations in local regulations, environmental exposure and site conditions require solutions that can adapt without compromising performance or certification.
Taken together, these factors make it difficult to treat infrastructure as a secondary consideration. It needs to be part of the core engineering discussion from the beginning.
Engineering for resilience, not just compliance
In long-life energy infrastructure, compliance with minimum standards is rarely sufficient to ensure long-term reliability. This is particularly true in nuclear applications, where infrastructure components are expected to perform consistently over decades, often with limited opportunities for maintenance or replacement.
In these environments, failure is rarely sudden; it tends to develop at the interfaces.
Meeting certification requirements is not enough. These systems must also maintain functionality under combined stresses, including thermal loads, mechanical vibration and environmental exposure. This makes it necessary to focus on verified performance, robust material selection and proven engineering principles.
Failure at a single interface can have disproportionate consequences, affecting not only safety systems but also operational continuity. In this context, resilience is a fundamental requirement.
Conclusion
The development of SMRs represents a significant step forward in the evolution of nuclear energy. However, the industry’s ability to deliver on this promise will depend on more than advancements in reactor technology.
Critical infrastructure systems, often overlooked in early discussions, play a decisive role in ensuring safe, reliable and economically viable operation over the full lifecycle of an installation.
As SMR projects transition from design to deployment, a broader engineering perspective will be required, one that extends beyond the reactor itself.
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Contributed by Martin Froborg, global segment manager from MCT Brattberg
