Morgan Lewis’s energy lawyers regularly track developments impacting the nuclear industry on the firm’s Up & Atom blog. Throughout 2023, the team provided updates on new rules and guidance from the US Nuclear Regulatory Commission (NRC or Commission) and the US Department of Energy (DOE) that impacted cybersecurity, small modular reactors, advanced reactors, sustainability, export controls, plant decommissioning, microreactors, fusion systems, and more. This report provides an overview of those developments from the last year, as well as thoughts on what 2024 may hold for the nuclear energy industry.