The Final Safety Analysis Report (FSAR) is prepared by a company seeking an operating license for a nuclear power plant, detailing safety analyses and operational plans. In contrast, the Final Safety Evaluation Report (FSER) is issued by the Nuclear Regulatory Commission (NRC) and summarizes their review of the FSAR. The FSER includes findings from the NRC's evaluation of safety submissions from utilities or suppliers. Additionally, modern plants utilize Design Certification Documents (DCDs), which function similarly to Preliminary Safety Analysis Reports (PSARs) and are governed by specific regulatory frameworks. Understanding these distinctions is crucial for compliance and safety in nuclear power operations.