Advanced and Small Modular Reactors (A/SMRs) are critical to meeting the world’s surging energy demands. While headlines often focus on data centers driving nuclear energy demand, these compact reactors will also power military installations, industrial hubs, and growing cities worldwide.
Benefits of A/SMRs:
A/SMRs offer district advantages over traditional, large scale nuclear energy facilities. Modular construction lowers upfront costs and accelerates build timelines, while a smaller footprint allows deployment in remote or off-grid locations. Many designs also leverage High Assay Low-Enriched Uranium (HALEU), which yields greater fuel efficiency and generates significantly less nuclear waste than conventional low-enriched uranium.
Crucially, passive safety systems. Relying on natural physics, like gravity, natural circulation, and thermal expansion, these systems can safely shut down a reactor without human interaction or external power. Furthermore, many designs rely on analog or isolated instrumentation, dramatically decreasing the digital attack surface available to cyberattack.
A/SMR Security: 2025 to 2050
The threat landscape facing energy infrastructure is evolving rapidly. Unlike legacy plants built decades ago when physical security and access control were the most immediate concerns, modern reactors face hybrid threats: sophisticated cyber intrusions, supply chain tampering, and physical attacks. Today’s reactor developers have a unique opportunity to ensure cybersecurity is built-in by design rather than added after the fact. Operational resilience hinges on securing both Information Technology (IT) for business networks and data transmissions; and Operational Technology (OT) for physical, real time industrial controls to safely move power from the core to the grid. Cybersecurity generally prioritizes the protection of IT, but effective operational resilience must comprehensively address both IT and OT.
To withstand cyberattacks, advanced reactors integrate physical engineered fail safes. For example, molten salt reactors (MSR) operate with sodium plugs that can melt, shutting down the reactor in the event of a system failure, e.g., power loss, or due to attack. Paired with strict Zero Trust architecture where every component, firmware update and network access is rigorously verified, operators can see and neutralize threats before they reach critical systems.
Downstream Vulnerabilities:
While preventing core damage is paramount, consistent power distribution is equally important. While designed with cybersecurity in mind, A/SMRs could still be vulnerable to cyberattacks and physical attacks further downstream, often referred to as “balance of plant”, such as the heat exchanger, generator, turbine controls, plant switchyard, or electricity substation. Attacks at any of those locations could lead an emergency reactor shut down, regardless of how protected its core is. When the power cuts out, the downstream critical infrastructure goes dark.
How Can Tier Tech International Help?
Where there is risk, there is opportunity. Through TTI’s Risk Informed Opportunity Sequences (RIOS) framework, we help organizations to pinpoint critical digital assets, mitigate supply chain exposure, and build proactive resilience quantifiably. identify assets crucial for protection, but also opportunities for proactive cybersecurity and operational resilience. RIOS guides organizations through key challenges:
- Deployment and regulatory uncertainty
- Nuclear and OT Supply chain fragility
- Cyber/physical security integration
- Grid integration complexity
At Tier Tech International, we work alongside you to mitigate or eliminate vulnerabilities, build resilience, and stay ahead of emerging threats. Together we can make sure you’re ready for whatever comes next.
