SMR stands for Small Modular Reactor, a compact nuclear power design made from smaller, factory-built modules. Compared with traditional large reactors, SMRs are designed for phased deployment, easier siting, and more flexible integration with industrial users or grid expansion plans.
In cyber security, SMRs matter because they sit inside critical infrastructure. Their digital instrumentation and control systems, remote monitoring links, supply-chain software, and maintenance networks can become attack surfaces. A successful intrusion may not need to reach the reactor core; compromise of corporate IT, contractor access, or engineering workstations can still disrupt operations, delay maintenance, or create safety risk. Defenses focus on strict network segmentation, least-privilege access, signed updates, air-gapped or tightly controlled safety systems, and strong incident-response procedures. For operators, SMR security is as much about protecting control systems and vendors as it is about protecting the plant itself.