Report to Congress on Abnormal Occurrences – Fiscal Year 2022 (NUREG-0090, Volume 45)

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Publication Information

Manuscript Completed: June 2023
Date Published: June 2023

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

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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 eight events in Agreement States and one event involving an NRC licensee that were identified as AOs during fiscal year 2022. 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.” The other two events involved non-medical overexposures. No events at a commercial nuclear power plant met the criteria for AOs.

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 2022 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.

Page Last Reviewed/Updated Wednesday, June 14, 2023