Report to Congress on Abnormal Occurrences Fiscal Year 2023 (NUREG-0090, Volume 46)

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Publication Information

Manuscript Completed: April 2024 
Date Published: April 2024 

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 describes nine events in Agreement States and two events involving NRC licensees that were identified as AOs during fiscal year 2023. These events were identified based on the criteria in the NRC policy statement "Abnormal Occurrence Reports," published in Volume 82 of the Federal Register (FR), page 45907 (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." Three AOs involved the theft or diversion and recovery of Category 2 radioactive material sources, as defined in 10 CFR Part 37, "Physical Protection of Category 1 and Category 2 Quantities of Radioactive Material." The other AO involved a human exposure event. No events at a commercial nuclear power plant met the AO criteria.

Appendix A, "Abnormal Occurrence Criteria,” to this report presents the NRC's criteria for identifying AOs. The NRC did not identify any events during fiscal year 2023 that met the guidelines for inclusion in Appendix B, “Other Events of Interest." One event 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.