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Home NRC Library Document Collections NUREG-Series Publications Publications Prepared by NRC Staff Report to Congress on Abnormal Occurrences (NUREG-0090)

Report to Congress on Abnormal Occurrences Fiscal Year 2024 (NUREG-0090, Volume 47)

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Publication Information

Manuscript Completed: May 2025
Date Published: May 2025

Office of Nuclear Regulatory Research
United States Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

Section 208 of the Energy Reorganization Act of 1974, as amended (Public Law 93-438), defines an abnormal occurrence (AO) as an unscheduled incident or event that the U.S. Nuclear Regulatory Commission (NRC) determines to be significant from the standpoint of public health or safety. The Federal Reports Elimination and Sunset Act of 1995 (Public Law 104-66) changed the AO reporting frequency from quarterly to annual.

This report on AOs for fiscal year (FY) 2024 describes seven events involving Agreement State licensees and one event involving an NRC licensee. These events were identified based on the criteria in the NRC policy statement "Abnormal Occurrence Reports" (82 FR 45907; October 2, 2017). Seven AOs were medical events as defined in Title 10 of the Code of Federal Regulations Part 35, "Medical Use of Byproduct Material." The other AO involved two criteria: (1) a substantial breakdown of physical security, cybersecurity, or material control and accountability programs that significantly weakens protection against loss, theft, diversion, or sabotage, and (2) a serious safety–-significant deficiency in management or procedural controls. No events at commercial nuclear power plants met the criteria for an AO.

Appendix A, "Abnormal Occurrence Criteria," to this report presents the NRC’s criteria for identifying AOs. The NRC identified no events during FY 2024 that met the guidelines for inclusion in Appendix B, “Other Events of Interest.” Two events met the guidelines for inclusion in Appendix C, "Updates on Previously Reported Abnormal Occurrences." Appendix D, "Glossary," defines terms used throughout this report. Appendix E, "Conversion Table," presents conversions commonly used when calculating doses.

Page Last Reviewed/Updated Friday, May 30, 2025