United States Nuclear Regulatory Commission - Protecting People and the Environment
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Accident Sequence Precursor Program - Results, Trends, and Insights

Office of Nuclear Regulatory Research
The Accident Sequence Precursor (ASP) Program assesses licensee event reports at U.S. nuclear power plants (NPPs) to identify potential precursors to core damage. The insights gained from evaluating the risk significance and potential generic applicability of these events assist in fulfilling the U.S. Nuclear Regulatory Commission (NRC) Safety Objective #1 to prevent and mitigate accidents and ensure radiation safety. Information from ASP analyses provides input into the NRC’s long-term operating experience program; communicates risk-significance insights related to overall plant performance on a plant-specific and fleet-wide basis, including events resulting from performance deficiencies, design deficiencies, and external initiating events; and contributes to ongoing efforts in improvement of probabilistic risk assessment. In providing fleet-wide insights on NPP performance, the ASP Program independently verifies the effectiveness of NRC programs [e.g., Reactor Oversight Process (ROP) and the Maintenance Rule]. Fleet-wide risk profiles and trends can also provide insights and potential lessons-learned from the NRC’s licensing activities, including initiatives in risk-informing the regulatory process.

Page Last Reviewed/Updated Monday, June 04, 2018