US approves large-scale nuclear digital safety upgrade for reactors

The US Nuclear Regulatory Commission (NRC) has approved a pioneering large-scale digital safety upgrade for the Limerick Clean Energy Center, marking the first authorization of a comprehensive digital retrofit at an operating nuclear plant. This upgrade replaces multiple legacy analog safety systems with a single advanced digital plant protection system for Limerick’s Units 1 and 2. The modernization is expected to improve the plant’s reliability, diagnostic capabilities, and cybersecurity, setting a regulatory precedent that could enable similar upgrades across the US nuclear fleet. The project aligns with Pennsylvania’s goals to expand carbon-free energy, as Limerick currently generates 2,317 megawatts—enough to power 1.7 million homes—and supports growing regional energy demands. The installation will occur in phases during scheduled refueling outages, providing a significant economic boost to Montgomery County through increased demand for local services and skilled labor. Supported by the US Department of Energy’s Light Water Reactor Sustainability Program, the upgrade is seen as vital to national energy security