NUREG-0090 Volume 40, Report to Congress on Abnormal Occurrences - Fiscal Year 2017.

NUREG-0090, Vol. 40, Report to Congress on Abnormal Occurrences - Fiscal Year 2017.

ML18157A051
Person / Time
Issue date:	06/30/2018
From:	Vered Shaffer Office of Nuclear Regulatory Research
To:
Meyd, Donald
References
NUREG-0090 V40
Download: ML18157A051 (53)

Text

NUREG-0090 Volume 40 Report to Congress on Abnormal Occurrences Fiscal Year 2017 Office of Nuclear Regulatory Research

AVAILABILITY OF REFERENCE MATERIALS IN NRC PUBLICATIONS NRC Reference Material Non-N RC Reference Material As of November 1999, you may electronically access Documents available from public and special technical NUREG-series publications and other NRC records at libraries include all open literature items, such as books, the NRC's Public Electronic Reading Room at journal articles, transactions, Federal Register notices, http://www.nrc. gov/reading-rm.html. Publicly released Federal and State legislation, and congressional reports.

records include, to name a few, NUREG-series Such documents as theses, dissertations, foreign reports publications; Federal Register notices; applicant, and translations, and non-NRC conference proceedings licensee, and vendor documents and correspondence; may be purchased from their sponsoring organization.

NRC correspondence and internal memoranda; bulletins Copies of industry codes and standards used in a and information notices; inspection and investigative substantive manner in the NRC regulatory process are reports; licensee event reports; and Commission papers maintained at-and their attachments.

The NRC Technical Library NRC publications in the NUREG series, NRC Two White Flint North regulations, and Title 10, "Energy," in the Code of 11545 Rockville Pike Federal Regulations may also be purchased from one Rockville, MD 20852-2738 of these two sources.

These standards are available in the library for reference

1. The Superintendent of Documents use by the public. Codes and standards are usually U.S. Government Publishing Office copyrighted and may be purchased from the originating Mail Stop SSOP organization or, if they are American National Standards, from-Washington, DC 20402-0001 American National Standards Institute Internet: http://bookstore.gpo.gov 11 West 42nd Street Telephone: 1-866-512-1800 New York, NY 10036-8002 Fax: (202) 512-2104 http://www.ansi.org (212) 642-4900

2. The National Technical Information Service 5301 Shawnee Road Alexandria, VA 22161-0002 Legally binding regulatory requirements are stated only in la\J\IS; NRC regulations; licenses, including technical http://www.ntis.gov specifications; or orders, not in NUREG-series 1-800-553-6847 or, locally, (703) 605-6000 publications. The views expressed in contractor prepared publications in this series are not necessarily A single copy of each NRC draft report for comment is those of the NRC.

available free, to the extent of supply, upon written request as follows: The NUREG series comprises (1) technical and U.S. Nuclear Regulatory Commission administrative reports and books prepared by the staff Office of Administration (NUREG-XXXX) or agency contractors (NUREG/CR-XXXX), (2) proceedings of conferences Multimedia, Graphics, and Storage &

(NUREG/CP-XXXX), (3) reports resulting from Distribution Branch international agreements (NUREG/IA-XXXX), (4)

Washington, DC 20555-0001 brochures (NUREG/BR-XXXX), and (5) compilations of E-mail: distribution.resource@nrc.gov legal decisions and orders of the Commission and Facsimile: (301) 415-2289 Atomic and Safety Licensing Boards and of Directors' decisions under Section 2.206 of NRC's regulations Some publications in the NUREG series that are (NUREG-0750).

posted at the NRC's Web site address http://www.nrc.gov/reading-rm/doc-collections/nuregs DISCLAIMER: This report was prepared as an account of are updated periodically and may differ from the last work sponsored by an agency of the U.S. Government.

printed version. Although references to material Neither the U.S. Government nor any agency thereof, nor found on a Web site bear the date the material was any employee, makes any warranty, expressed or accessed, the material available on the date cited implied, or assumes any legal liability or responsibility for may subsequently be removed from the site. any third party's use, or the results of such use, of any information, apparatus, product, or process disclosed in this publication, or represents that its use by such third party v.ould not infringe privately owned rights.

SR-CR 08/2016

NUREG-0090 Volume 40 Report to Congress on Abnormal Occurrences Fiscal Year 2017 Manuscript Completed: June 2018 Date Published: June 2018 Office of Nuclear Regulatory Research

NUREG-0090 Volume 40 Report to Congress on Abnormal Occurrences Fiscal Year 2017 Office of Nuclear Regulatory Research

AVAILABILITY OF REFERENCE MATERIALS IN NRC PUBLICATIONS NRC Reference Material Non-N RC Reference Material As of November 1999, you may electronically access Documents available from public and special technical NUREG-series publications and other NRC records at libraries include all open literature items, such as books, the NRC's Public Electronic Reading Room at journal articles, transactions, Federal Register notices, http://www.nrc. gov/reading-rm.html. Publicly released Federal and State legislation, and congressional reports.

records include, to name a few, NUREG-series Such documents as theses, dissertations, foreign reports publications; Federal Register notices; applicant, and translations, and non-NRC conference proceedings licensee, and vendor documents and correspondence; may be purchased from their sponsoring organization.

NRC correspondence and internal memoranda; bulletins Copies of industry codes and standards used in a and information notices; inspection and investigative substantive manner in the NRC regulatory process are reports; licensee event reports; and Commission papers maintained at-and their attachments.

The NRC Technical Library NRC publications in the NUREG series, NRC Two White Flint North regulations, and Title 10, "Energy," in the Code of 11545 Rockville Pike Federal Regulations may also be purchased from one Rockville, MD 20852-2738 of these two sources.

These standards are available in the library for reference

1. The Superintendent of Documents use by the public. Codes and standards are usually U.S. Government Publishing Office copyrighted and may be purchased from the originating Mail Stop SSOP organization or, if they are American National Standards, from-Washington, DC 20402-0001 American National Standards Institute Internet: http://bookstore.gpo.gov 11 West 42nd Street Telephone: 1-866-512-1800 New York, NY 10036-8002 Fax: (202) 512-2104 http://www.ansi.org (212) 642-4900

2. The National Technical Information Service 5301 Shawnee Road Alexandria, VA 22161-0002 Legally binding regulatory requirements are stated only in la\J\IS; NRC regulations; licenses, including technical http://www.ntis.gov specifications; or orders, not in NUREG-series 1-800-553-6847 or, locally, (703) 605-6000 publications. The views expressed in contractor prepared publications in this series are not necessarily A single copy of each NRC draft report for comment is those of the NRC.

available free, to the extent of supply, upon written request as follows: The NUREG series comprises (1) technical and U.S. Nuclear Regulatory Commission administrative reports and books prepared by the staff Office of Administration (NUREG-XXXX) or agency contractors (NUREG/CR-XXXX), (2) proceedings of conferences Multimedia, Graphics, and Storage &

(NUREG/CP-XXXX), (3) reports resulting from Distribution Branch international agreements (NUREG/IA-XXXX), (4)

Washington, DC 20555-0001 brochures (NUREG/BR-XXXX), and (5) compilations of E-mail: distribution.resource@nrc.gov legal decisions and orders of the Commission and Facsimile: (301) 415-2289 Atomic and Safety Licensing Boards and of Directors' decisions under Section 2.206 of NRC's regulations Some publications in the NUREG series that are (NUREG-0750).

posted at the NRC's Web site address http://www.nrc.gov/reading-rm/doc-collections/nuregs DISCLAIMER: This report was prepared as an account of are updated periodically and may differ from the last work sponsored by an agency of the U.S. Government.

printed version. Although references to material Neither the U.S. Government nor any agency thereof, nor found on a Web site bear the date the material was any employee, makes any warranty, expressed or accessed, the material available on the date cited implied, or assumes any legal liability or responsibility for may subsequently be removed from the site. any third party's use, or the results of such use, of any information, apparatus, product, or process disclosed in this publication, or represents that its use by such third party v.ould not infringe privately owned rights.

SR-CR 08/2016

NUREG-0090 Volume 40 Report to Congress on Abnormal Occurrences Fiscal Year 2017 Manuscript Completed: June 2018 Date Published: June 2018 Office of Nuclear Regulatory Research

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 requirement from a quarterly basis to an annual one.

This report describes five events involving NRC licensees that the agency identified as AOs during fiscal year (FY) 2017 based on the criteria defined in the reports Appendix A, Abnormal Occurrence Criteria and Guidelines for Other Events of Interest. All five AOs were medical events as defined in Title 10 of the Code of Federal Regulations (10 CFR) Part 35, Medical Use of Byproduct Material. During this reporting period, no events at commercial nuclear power plants in the United States were identified as AOs.

In addition, this report describes six other medical events, as defined in 10 CFR Part 35 that occurred in Agreement States and were identified as AOs during FY 2017 based on the criteria defined in Appendix A. Agreement States are those States that have entered into formal agreements with the NRC, pursuant to Section 274 of the Atomic Energy Act of 1954, as amended (AEA) (Public Law 83-703), to regulate certain quantities of AEA material at facilities within their borders. Currently, there are 37 Agreement States.

Appendix A to this report presents the NRCs criteria for identifying AOs, as well as the guidelines for selecting other events of interest. Appendix B, Updates of Previously Reported Abnormal Occurrences, provides updated information for one event that was identified in the FY 2016 Report to Congress on Abnormal Occurrences. The NRC identified one event during FY 2017 that met the guidelines for inclusion in Appendix C, Other Events of Interest.

Appendix D, Glossary, defines terms used throughout this report. Appendix E, Conversion Table, presents conversions commonly used when calculating doses.

iii

CONTENTS ABSTRACT......................................................................................................................... iii CONTENTS.v EXECUTIVE

SUMMARY

............................................................................................................vii INTRODUCTION ............................................................................................................vii THE LICENSING AND REGULATORY SYSTEM ...........................................................vii REPORTABLE EVENTS ............................................................................................... viii AGREEMENT STATES ................................................................................................. viii INTERNATIONAL INFORMATION............ix UPDATES OF PREVIOUSLY REPORTED ABNORMAL OCCURRENCES..........ix OTHER EVENTS OF INTEREST.......ix ABBREVIATIONS ...................................................................................................................... xi ABNORMAL OCCURRENCES IN FISCAL YEAR 2017 ..............................................................1 I. ALL LICENSEES................................................................................................1 II. COMMERCIAL NUCLEAR POWER PLANT LICENSEES....1 III. EVENTS AT FACILITIES OTHER THAN NUCLEAR POWER PLANTS AND ALL TRANSPORTATION EVENTS....................................................................1 AS17-01 Medical Event at Taylor Regional Hospital in Campbellsville, Kentucky..........2 NRC17-01 Medical Event at Washington University in St. Louis, St. Louis, Missour.............................................................................................3 AS17-02 Medical Event in State of New York............5 NRC17-02 Medical Event at Henry Ford Hospital, Detroit, Michigan................6 AS17-03 Medical Event at Duke University Medical Center, Durham, North Carolina............7 AS17-04 Medical Event at The Urology Center, Cincinnati, Ohio.......9 NRC17-03 Medical Event at Siouxland Urology Center, Dakota Dunes, South Dakota..................................10 AS17-05 Medical Event at Ochsner Clinic Foundation, Baton Rouge, Louisiana........11 NRC17-04 Medical Event at Providence Alaska Medical Center, Anchorage, Alaska.........................12 AS17-06 Medical Event at Mayo Clinic, Jacksonville, Florida.......14 NRC17-05 Medical Event at Washington University in St. Louis, St. Louis, Missouri.........16 APPENDIX A ABNORMAL OCCURRENCE CRITERIA AND GUIDELINES FOR OTHER EVENTS OF INTEREST....A-1 APPENDIX B UPDATES OF PREVIOUSLY REPORTED ABNORMAL OCCURRENCES....B-1 v

APPENDIX C OTHER EVENTS OF INTEREST ....................................................................C-1 OEI 17-01 Human Exposure Event at the Department of Commerce, National Institute of Standards and Technology, Gaithersburg, Maryland......................................C-1 APPENDIX D GLOSSARY ....................................................................................................D-1 APPENDIX E CONVERSION TABLE.. ..............................................................................E-1 vi

EXECUTIVE

SUMMARY

INTRODUCTION 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 requirement from a quarterly basis to an annual one.

This report describes events that the NRC or an Agreement State identified as AOs during fiscal year (FY) 2017, based on the criteria defined in this reports Appendix A, Abnormal Occurrence Criteria and Guidelines for Other Events of Interest. Agreement States are those States that have entered into formal agreements with the NRC, pursuant to Section 274 of the Atomic Energy Act of 1954, as amended (AEA) (Public Law 83-703), to regulate certain quantities of AEA material at facilities within their borders. The NRC has determined that, of the incidents and events reviewed for this reporting period, only those that are described in this report meet the criteria for being reported as AOs. For each AO, this report documents the date and place, nature and probable consequences, cause or causes, and actions taken to prevent recurrence.

Of the 11 AOs discussed, two occurred in previous fiscal years but are included in this report because the NRC completed its evaluation of them during FY 2017. Information concerning AOs must be complete to permit an adequate evaluation. Occasionally, all the required information is not available in time to evaluate and report on an AO in the fiscal year of its occurrence. For example, one of the two events occurred in 2011, but it was not identified until late in FY 2016.

Appendix A to this report presents the NRCs criteria for identifying AOs, as well as the guidelines for selecting other events of interest. Appendix B, Updates of Previously Reported Abnormal Occurrences, provides updated information for one event included in the FY 2016 Report to Congress on Abnormal Occurrences.

The NRC identified one event during FY 2017 that met the guidelines for inclusion in Appendix C, Other Events of Interest. Appendix D, Glossary, defines terms used throughout this report. Appendix E, Conversion Table, presents conversions commonly used when calculating doses.

THE LICENSING AND REGULATORY SYSTEM The system of licensing and regulation used by the NRC to carry out its responsibilities is implemented through the rules and regulations in Title 10 of the Code of Federal Regulations.

The NRC regularly conducts licensing reviews, inspections, enforcement, investigations, operating experience evaluations, incident response, and confirmatory research. The agency informs and involves stakeholders and the public in its regulatory process, consistent with the NRCs Strategic Plan: Fiscal Years 2018-2022 (NUREG-1614, Volume 7), published February 2018.

The NRC adheres to the philosophy that multiple levels of protection best ensure public health and safety. The agency achieves and maintains these levels of protection through regulations specifying requirements that ensure the safe use of radioactive materials. Those regulations vii

contain design, operation, and quality assurance criteria appropriate for the various activities regulated by the NRC. Licensing, inspection, investigations, and enforcement programs offer a regulatory framework to ensure compliance with the regulations. In addition, the NRC is striving to make the regulatory system more risk informed and performance based, where appropriate. Agreement States conduct regulatory programs that are adequate to protect the public health and safety and compatible with NRCs program.

REPORTABLE EVENTS The NRC initially issued the AO criteria in a Commission policy statement published in the Federal Register (FR) on February 24, 1977 (42 FR 10950), followed by several revisions in subsequent years. The agency published the most recent revision to the AO criteria in the Federal Register on October 2, 2017 (82 FR 45907); the revised criteria became effective on that date. This revision establishes the criteria that will be used to define AOs for the FY 2018 report and forward. Since the October 2017 criteria were not in effect during FY 2017, this report uses the revision to the AO criteria published in the Federal Register on October 12, 2006 (71 FR 60198), to define AOs for this report. The October 2017 AO criteria will be used in future reports.

Reviews of, and responses to, operating experience are essential to ensure that licensees conduct their activities safely. Toward that end, NRC regulations require that licensees report certain incidents or events to the NRC. Such reporting helps to identify deficiencies and ensure that corrective actions are taken to prevent recurrence.

The NRC and its licensees review and evaluate operating experience to identify safety concerns. The NRC responds to risk-significant issues through licensing reviews, inspections, and enhancements to regulations. In addition, the agency maintains operational data in computer-based data files for more effective collection, storage, retrieval, and evaluation of events.

The NRC routinely makes information and records on reportable events at licensed facilities available to the public. The agency also disseminates information through public announcements and special notifications to licensees and other stakeholders. The NRC issues a Federal Register notice describing AOs that occurred in the previous fiscal year at facilities licensed or otherwise regulated by the NRC or Agreement States. In addition, the NRC routinely informs Congress of significant events, including AOs that occur at licensed or regulated facilities.

AGREEMENT STATES Agreement States are those States that have entered into formal agreements with the NRC, pursuant to Section 274 of the AEA, to regulate certain quantities of AEA material at facilities within their borders. Agreement States must maintain programs that are adequate to protect public health and safety and are compatible with the Commissions program for such materials. Currently, there are 37 Agreement States. Wyoming and Vermont have submitted applications to become Agreement States. Agreement States report event information to the NRC in accordance with compatibility criteria established by the Policy Statement on Adequacy and Compatibility of Agreement State Programs, which the agency published in viii

the Federal Register on September 3, 1997 (62 FR 46517) 1. The NRC also has procedures in place for evaluating materials events and identifying those that meet the AO criteria. The NRC uniformly applies the AO criteria as described in Appendix A to events at licensee facilities or activities involving use of radioactive material regulated by either the NRC or the Agreement States. In 1977, the Commission determined that the annual report to Congress should also include events that meet the criteria for AOs at licensees regulated by Agreement States. The Federal Register notice that the NRC issues to disseminate AO-related information to the public includes these events as well.

INTERNATIONAL INFORMATION The NRC exchanges information with various foreign governments that regulate nuclear facilities and materials. The agency reviews and considers this international information in its research and regulatory activities, as well as in its assessment of operating experience.

Although the NRC may occasionally refer to such information in its AO reports to Congress, the agency reports only domestic AOs.

UPDATES OF PREVIOUSLY REPORTED ABNORMAL OCCURRENCES The NRC includes updates on previously reported AOs that remain open during the fiscal year addressed in the report or for which significant new information becomes available. Appendix B provides an update for one AO that was identified in last years report to Congress (NUREG-0090, Volume 39, Report to Congress on Abnormal Occurrences: Fiscal Year 2016). This AO involved a medical event at Legacy Good Samaritan Medical Center in Portland, OR.

OTHER EVENTS OF INTEREST The NRC offers information about events that do not meet the criteria for being identified as AOs, but fall within the guidelines for inclusion in Appendix C, Other Events of Interest.

1 In October 2017, after the reporting period for this report, the NRC published the, "Agreement State Program Policy Statement," which revised and consolidated previous policy statements related to the NRC's Agreement Statement Program, including the 1997 Policy Statement on Adequacy and Compatibility of Agreement State Programs. Future AO reports will reference the revised Agreement State compatibility criteria as contained in the October 2017 Agreement State Program Policy Statement.

ix

ABBREVIATIONS AEA Atomic Energy Act of 1954, as amended AO abnormal occurrence AS Agreement State AU authorized user CFR Code of Federal Regulations cGy centigray(s)

Ci Curie(s)

CT computerized tomography FR Federal Register FY fiscal year GBq gigabecquerel(s)

Gy gray(s)

I iodine MBq megabecquerel(s)

µCi microcurie(s) mCi millicurie(s)

MD management directive mrem millirem mSv millisievert(s)

NIST National Institute of Standards and Technology NRC U.S. Nuclear Regulatory Commission Pd palladium PPS patient positioning system rad radiation absorbed dose rem roentgen equivalent man RHB Radiation Health Branch (KY)

RPS Radiation Protection Services (OR)

Sv Sievert(s)

TRH Taylor Regional Hospital TBq terabecquerel(s)

TEDE total effective dose equivalent Y yttrium xi

ABNORMAL OCCURRENCES IN FISCAL YEAR 2017 Appendix A, Abnormal Occurrence Criteria and Guidelines for Other Events of Interest, supplies the specific criteria for determining whether an event is an abnormal occurrence (AO).

It also offers the guidelines for reporting other events of interest that may not meet the AO criteria but that the U.S. Nuclear Regulatory Commission (NRC) has determined should be included in this report. Appendix A contains criteria for four major categories:

I. All Licensees II. Commercial Nuclear Power Plant Licensees III. Events at Facilities other than Nuclear Power Plants and All Transportation Events IV. Other Events of Interest.

This section discusses events in Categories I, II, and III. Appendix C addresses Category IV events.

I. ALL LICENSEES During fiscal year (FY) 2017, no events were identified as AOs based on Criterion I, All Licensees in Appendix A.

II. COMMERCIAL NUCLEAR POWER PLANT LICENSEES During this reporting period, no events at commercial nuclear power plants in the United States met the criteria for AOs described in Appendix A.

III. EVENTS AT FACILITIES OTHER THAN NUCLEAR POWER PLANTS AND ALL TRANSPORTATION EVENTS During this reporting period, five events at NRC licensee facilities and six events at Agreement State licensee facilities were identified as AOs based on Criterion III, Events at Facilities Other Than Nuclear Power Plants and All Transportation Events, in Appendix A.

1

AS17-01 Medical Event at Taylor Regional Hospital in Campbellsville, Kentucky Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place September 26, 2011, Campbellsville, KY Nature and Probable Consequences On May 9, 2016, Taylor Regional Hospital (TRH) reported that during a 2016 examination of prostate brachytherapy procedures, the hospital discovered that a prostate brachytherapy seed implant procedure that met the medical event criteria had occurred on September 26, 2011. The patient was prescribed to receive an activity of 4.16 gigabecquerels (GBq) (112.5 millicuries (mCi)) of palladium (Pd)-103 brachytherapy seeds for a total dose of 9,500 centigrays (cGy) (rad). Post-implant dosimetry for the patient revealed that the total dose delivered to the prostate was 16,480 cGy (rad), which was approximately 73 percent greater than prescribed.

The referring physician was notified. The licensee reported that no adverse health effects are expected as a result of the additional dose.

Cause(s) The investigation of the cause of the event is ongoing at this time.

Actions Taken To Prevent Recurrence Licensee As of October 2016, TRH discontinued its manual brachytherapy program after discovering that multiple prostate brachytherapy medical events had occurred between 2011 and 2016 (including the AO reported here).

State The Commonwealth of Kentucky, Radiation Health Branch (RHB), conducted routine health and safety and followup inspections at TRH as a result of the discovery of multiple medical events involving prostate brachytherapy. RHB issued several notices of violation to TRH including one for failure to report medical events in accordance with Kentuckys regulations. On October 26, 2016, TRH sent RHB a letter requesting the removal of manual brachytherapy authorization from the facilitys license, and RHB removed such authorization on December 5, 2016, for failure to achieve compliance.

This event is closed for the purpose of this report.

2

NRC17- 01 Medical Event at Washington University in St. Louis, St. Louis, Missouri Criterion III.C.1.b and III.C.2.b(iii), For Medical Licensees, of Appendix A to this report provide, in part, that a medical event shall be considered for reporting as an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is delivered to the wrong treatment site.

Date and Place April 8, 2016, St. Louis, MO Nature and Probable Consequences On April 8, 2016, Washington University in St. Louis treated a patient with yttrium (Y)-90 microsphere brachytherapy for liver cancer. The authorized user (AU) prescribed 117 Gy (11,700 rad) by administering 4.15 GBq (112.16 mCi) to the left lobe of the liver. During the treatment, the interventional radiologist used an angiogram to confirm the catheter placement, which controls where the microspheres will be delivered. The delivered activity was 4.07 GBq (110 mCi). Images from post-treatment positron emission tomography/magnetic resonance imaging indicated that approximately 95 percent of the microspheres were deposited in the right (unintended) lobe of the liver, resulting in a dose of 93.8 Gy (9,380 rad). The patient and the prescribing physician were notified of this event. The patient remained under the care of the licensee after the Y-90 procedure. The AU chose not to administer microspheres to the left lobe of the patients liver to make up for the underdose.

Instead, the patient was treated with chemotherapy. Following the procedure, the patient had no significant changes to liver function that were inconsistent with liver cancer and had no abdominal pain.

Cause(s) The licensee speculated that the cause of the medical event was unintentional patient intervention (defined in 10 CFR 35.2, Definitions) that shifted the catheter tip, such as breathing, coughing, or other movement by the patient. However, there was no specific evidence to indicate that any such movement occurred. The NRC inspector could not determine the cause of the medical event because there was no indication of patient intervention, shunting, or other potential causes. Nonetheless, the inspector identified the amount of time between the angiogram and the administration of the microspheres to the patient as a contributing factor to the medical event. Specifically, the 32-minute gap between the angiogram and the microsphere administration increased the potential for catheter tip movement away from the intended position.

Actions Taken To Prevent Recurrence Licensee Although the licensee could not determine the cause of the medical event, the licensee promptly implemented generic, immediate corrective actions to prevent a similar medical event. The focus of the corrective actions was on communications between the team members regarding any concerns about catheter placement, including establishing standard language to voice a concern, reminding the team about safety culture to include stopping the process and speaking up if there is any concern, and requiring that all participating team members confirm that the administration should proceed.

3

NRC The NRC performed a reactive inspection to review the circumstances and root and contributing causes, and proposed corrective actions for the medical event. The NRCs medical consultant stated that following the medical event the patients right liver lobe will likely atrophy with focal fibrosis, and the left lobe may somewhat hypertrophy.

This event is closed for the purpose of this report.

4

AS17-02 Medical Event in the State of New York Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered for reporting as an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and a dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place December 29, 2016, NY Nature and Probable Consequences New York reported a medical event involving Y-90 microsphere brachytherapy for a patient with a history of neuroendocrine tumors of uncertain origin with metastatic disease to the liver and lung. The AU prescribed Y-90 treatment activity of 90.76 megabecquerels (MBq) (2.453 mCi) to a small lesion of the liver and 816.85 MBq (22.077 mCi) to a large lesion of the liver. A technologist prepared the two dosages in two vials in accordance with the written directive and placed the vials into shields bearing labels of the activity on each lid. In preparation for treatment of the small lesion, the technologist inadvertently delivered the wrong vial to the procedure room and left. Before administering the Y-90, the AU questioned if the dosage was correct because there was more volume of material in the vial than expected. When contacted, the technologist who prepared the dosage confirmed that it was the correct dosage, and the AU proceeded with treatment of the small lesion. Following this administration, the vial was returned to the shield. In preparation for treatment of the large lesion, the technologist delivered the shielded vial that was labeled as 816.85 MBq (22.077 mCi). Upon opening the lid and observing the amount of volume of material in the vial, the technologist determined that the vial intended for the large lesion had been used to treat the small lesion. The AU directed the staff to prepare a dose to treat the large lesion and was able to treat the large lesion as prescribed. The patient and referring physician were notified of the incident. The licensee reported that no adverse health effects are expected as a result of the additional dose to the small lesion.

Cause(s) The event was initiated because the technologist inadvertently brought the wrong dosage to the procedure room and apparently failed to read the label or misread the label.

There was a failure in communication in that the significance of the AUs concern about the dosage was not conveyed to the technologist. The technologist simply provided a verbal confirmation without performing a physical check of the activity.

Actions Taken To Prevent Recurrence Licensee The licensee implemented a requirement for a timeout before all treatments. As used in this procedure, a timeout is a brief pause that allows the medical staff to confirm that the treatment conforms to the written directive from the AU. The labeling requirements were revised so that both the vial and vial shield must be labeled and the label must be read three times before administration. All staff involved in Y-90 microsphere brachytherapy received training on the revised protocols in January 2017.

State The State of New Yorks Bureau of Environmental Radiation Protection Program required and received a root cause analysis and corrective action from the licensee. A reactive inspection was conducted on March 29-30, 2017, in conjunction with a full routine inspection.

This event is closed for the purpose of this report.

5

NRC17-02 Medical Event at Henry Ford Hospital, Detroit, Michigan Criterion III.C.1.b and III.C.2.b(iii), For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is delivered to the wrong treatment site.

Date and Place January 31, 2017, Detroit, MI Nature and Probable Consequences On January 31, 2017, Henry Ford Hospital reported that a patient undergoing Y-90 microsphere brachytherapy for liver cancer received an unintended dose to the right lobe of the liver. The AU prescribed 60 Gy (6,000 rad) by administering 1665 MBq (45 mCi) of Y-90 to only the left lobe of the patients liver. However, post-treatment imaging identified that an unintended dose of 36.5 Gy (3650 rad) was administered to the right lobe of the patients liver during the procedure.

The patient had previously had a Y-90 microsphere brachytherapy on December 7, 2016, with an intended dose of 141.6 Gy (14,160 rad) to the right lobe of the liver. The unintended dose received by the right lobe during the January 31 administration brings the cumulative dose to the right lobe to 178.2 Gy (17,820 rad). The licensee reported that no adverse health effects are expected as a result of the additional dose. The referring physician and patient were notified of the incident.

Cause(s) The NRC and the licensee could not determine the cause because there was no indication of patient movement, shunting, or other possible explanations. The patient had complex vascular anatomy, so the unintended administration is believed to have resulted from either a potential movement of the catheter caused by an unnoticed patient movement or undetected reflux.

Actions Taken To Prevent Recurrence Licensee After review, the licensee believes that the challenging vascular anatomy of the patient led to this unintended administration, and a corrective action to prevent recurrence of a similar event would be to exclude patients with similar anatomy. However, given the rarity of this type of incident and the potential benefits of the treatment, the licensee believes that this action is not viable. After the evaluation, the licensee determined that no action is warranted.

NRC The NRC has performed a reactive inspection and had a medical consultant review any possible medical effects from this medical event. The medical consultant reviewed the circumstances of this event and agreed with the licensees evaluation of (1) why the event occurred, (2) the effects on the individual who received the unintended dose, and (3) the licensees immediate actions on discovery. The medical consultant also agreed with the licensees determination that no further action was warranted, and added that patient movements as subtle as breathing may have affected the position of the catheter enough to influence the path of the microspheres within the liver once injected. Therefore, the NRC is in agreement with the licensees determination of no warranted action.

This event is closed for the purpose of this report.

6

AS17-03 Medical Event at Duke University Medical Center, Durham, North Carolina Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered for reporting as an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place February 24, 2017, Durham, NC Nature and Probable Consequences On February 24, 2017, a patient with colon cancer that had metastasized to the liver underwent Y-90 microsphere brachytherapy. The AU prescribed the treatment to be delivered in two rounds during the same procedure. Two segments of the liver were treated per round, with four segments total being treated, all located in the left lobe.

The first round of treatment administered 0.87 GBq (23.51 mCi) to segments IVa and IVb. The second round administered 2.05 GBq (59.50 mCi) to segments II and III. After completion of the procedure, while dictating a record of the treatment, the AU who performed the procedure noted that the dosage for the second vial seemed high. After reviewing the written directive, the AU noted that the dosage for the first round was administered correctly. However, the dosage for the second round to segments II and III was originally prescribed on the written directive to be 1.05 GBq. Upon review of the written directive and discussion with the radiopharmacist who ordered the dosage, it was determined that the radiopharmacist misread the prescribed dosage for the second round and entered 2.05 GBq rather than 1.05 GBq into the dosage conversion system. This resulted in a calculation of 55.35 mCi instead of 28.3 mCi. After performing the conversion, the radiopharmacist used the incorrectly converted amount in mCi on the written directive. Because the dosage label was in mCi and not GBq, and there was no procedural requirement to do a confirmatory dosage conversion check when receiving the material, the error was not noticed when the dosages were received. Subsequently, segments II and III of the liver received a dose of about 245 Gy (24,500 rad) instead of the prescribed 120 Gy (12,000 rad).

The referring physician and patient were notified of the incident. The licensee reported that no adverse health effects are expected as a result of the additional dose.

Cause(s) The event was caused by human error. Specifically, the radiopharmacist misread the written directive and therefore incorrectly converted the dosage from GBq to mCi.

Actions Taken To Prevent Recurrence Licensee The licensee added a verification step to ensure that the accuracy of the conversion has been checked in both the nuclear medicine and the radiopharmacy departments and developed a new written directive form to increase the clarity of the prescribed dose.

Additionally, the licensee has committed to using a new computational tool that includes automatic conversion of GBq to mCi. The licensee has started using a new radiopharmacy form that ensures accountability for activity calculations. At the request of the licensee, the manufacturer is now providing the activity of each dosage in GBq and mCi on the paperwork associated with each dose.

7

State The North Carolina Radiation Protection Section performed a reactive inspection on March 2, 2017, and March 17, 2017. As a result of the inspection, the agency issued two violations for failure to follow state requirements.

This event is closed for the purpose of this report.

8

AS17-04 Medical Event at The Urology Center, Cincinnati, Ohio Criterion III.C.1.b and III.C.2.b(iii), For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is delivered to the wrong treatment site.

Date and Place March 2, 2017, Cincinnati, OH Nature and Probable Consequences On March 3, 2017, the Urology Center reported a medical event involving brachytherapy seed implant treatment for prostate cancer. The written directive prescribed a dose of 110 Gy (11,000 rad) to the treatment region (prostate gland) utilizing 90 iodine (I)-125 seeds (999 MBq (27 mCi) total/ 11.1 MBq (0.3 mCi) per seed). During the procedure, the AU placed the first three needles, and the urologist placed the last 21 needles under ultrasound guidance, which revealed that needle placement was correct.

However, the post-implant dosimetric evaluation, using a computerized tomography (CT) scan performed on March 3, 2017, demonstrated that the dose delivered to the prostate was 27.6 Gy (2,760 rad), which was 25 percent of the prescribed dose. The CT images revealed that seeds from the last 21 needles were dropped approximately 1 centimeter inferiorly. The seeds did not end up in the rectum or the bladder, but in the most inferior aspect of the prostate extending down to the penile bulb (wrong treatment site). It is noted that the seeds dropped from the first three needles were placed adequately.

A medical physicist calculated the following D90 doses (dose that 90 percent of the volume received) to these structures: urethra = 26.02 Gy (2,602 rad); rectum = 8.61 Gy (861 rad);

penile bulb = 86.89 Gy (8,689 rad). The licensee reports that there are no acute effects to the patient or side effects to the areas outside the treatment site, specifically the rectum, urethra, or the penile bulb. The licensee notified the patient on March 3, 2017, about the inadequate implant and the need for a subsequent implant.

Cause(s) The cause of the event was human error by the licensee staff. The placement of the needles by the urologist under ultrasound guidance was appropriate. However, the technique used to drop the seeds from the needles may have caused a 1-centimeter shift in the placement of the seeds, causing them to miss the treatment site in the prostate gland.

Actions Taken To Prevent Recurrence Licensee Corrective actions included restricting the urologist participation in brachytherapy cases until he receives additional mentoring and training to verify the effectiveness of his needle placement and seed dropping technique.

State The Ohio Department of Health investigated on March 22, 2017. The department issued no violations to the licensee because of this medical event.

This event is closed for the purpose of this report.

9

NRC17-03 Medical Event at Siouxland Urology Center, Dakota Dunes, South Dakota Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place March 16, 2017, Dakota Dunes, SD Nature and Probable Consequences On March 16, 2017, a patient at Siouxland Urology Center was administered 6.838 GBq (184.8 mCi) of Pd-103 in 110 brachytherapy seeds to the prostate. The written directive prescribed 5 GBq (135 mCi) in 80 seeds for a dose of 12,500 cGy (rad). However, the administered dose was 58 percent greater than prescribed.

The medical physicist identified the error immediately following the procedure, and the referring physician and patient were notified of the event. The licensee reported that no adverse health effects are expected as a result of the additional dose.

Cause(s) This event was caused by the failure of the licensees medical physicist to enter the correct activity per seed into the spreadsheet used for the physics calculations. The spreadsheet contained a value from a previous calculation that was incorrect for this patient and was carried over during the calculations. Additionally, an independent verification of the treatment data was not performed.

Actions Taken To Prevent Recurrence Licensee Corrective actions included requiring a new secondary hand calculation and revising procedures to require that a blank spreadsheet template be used. Additionally, new procedures call for all staff members to agree that all input parameters for treatment are correct before beginning the implantation of radioactive seeds. Current employees have been trained, and new employees will be trained, on these new procedures. The licensee will maintain records of this training in each employees file.

NRC The NRC conducted a reactive inspection and issued a notice of violation to the licensee on July 25, 2017, for a failure to develop, implement, and maintain written procedures to provide high confidence that each administration is performed in accordance with the written directive, to include checking both manual and computer-generated dose calculations. The licensee replied to the notice of violation on August 16, 2017.

This event is closed for the purpose of this report.

10

AS17-05 Medical Event at Ochsner Clinic Foundation, Baton Rouge, Louisiana Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place April 20, 2017, Baton Rouge, LA Nature and Probable Consequences On April 20, 2017, Ochsner Clinic Foundation reported a medical event involving a patient who was administered 74 MBq (2 mCi) of I-131 when the patient was prescribed to receive 0.37 MBq (10 µCi) of I-131 for a whole-body scan to image for possible metastatic progression of the patients thyroid cancer. As a result, the patients thyroid was estimated to have received a radiation dose of approximately 16.3 Gy (1,630 rad). The administration of the incorrect dosage was discovered when a followup scan showed significantly higher uptake of I-131 in the thyroid than expected. The licensee determined that a nurse practitioner working under the supervision of an AU selected the wrong diagnostic test on the licensees electronic ordering software. Additionally, the AU did not complete a written directive for the administered activity as required by the license.

The patient and referring physician were notified of this event. As a result of this event, the licensee noted that the patient could experience an increased risk of hypothyroidism; however, this outcome is not expected. The licensee will perform blood tests to monitor the patients thyroid function as medically necessary.

Cause(s) This event was caused by human error by the licensees staff. The nurse practitioner selected the wrong diagnostic test on the licensees electronic software system, and the nuclear medicine technologist failed to verify that the activity ordered and received was that prescribed.

Actions Taken To Prevent Recurrence Licensee The licensee revised its procedures to require medical personnel to verify that the activity of ordered radiopharmaceuticals is equal to the activity prescribed and that the AU has completed a written directive when administering greater than 30 microcuries of I-131. The licensee also required training on its new procedures for all its technologists, ordering physicians, physicians assistants, nurse practitioners, and AUs. The licensee suspended use of I-131 for diagnostic purposes until the training is completed.

State Louisiana investigated this medical event and verified that the licensees corrective actions appear appropriate to prevent recurrence.

This event is closed for the purpose of this report.

11

NRC17-04 Medical Event at Providence Alaska Medical Center, Anchorage, Alaska Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place June 14, 2017, Anchorage, AK Nature and Probable Consequences On June 15, 2017, Providence Alaska Medical Center reported a medical event involving a patient who underwent Y-90 microsphere brachytherapy treatment in the liver. Using a treatment plan worksheet, the AU intended to prescribe a dose of 11,000 cGy (rad) to the right lobe of the liver based on the treatment plan. After the administration of Y-90 to the patient, the AU prepared, signed, and dated the written directive. Following the administration, the licensee determined that the patient had received a total of 54,000 cGy (rad) to the right lobe of the liver. As a result, the radiation dose to the right lobe of the liver was approximately 491 percent of the intended radiation dose from the treatment plan. The referring physician and patient were notified of the medical event. On December 8, 2017, the licensee reported that the patient is doing well without significant symptomatic complications as a result of the medical event.

Causes The nuclear medicine technologist ordered the activity of Y-90 based on the AUs circled values on the treatment plan worksheet. The AUs circled values lacked clarity and as a result, the nuclear medicine technologist ordered an incorrect activity of Y-90. The activity of Y-90 required to administer the AUs planned radiation dose to the right lobe of the liver on the scheduled treatment date and time was 1.691 GBq (45.7 mCi). However, the nuclear medicine technologist ordered and received a vial of Y-90 that contained approximately 8.604 GBq (232.5 mCi) on the scheduled treatment date. The vial of Y-90 was measured by the nuclear medicine technologist prior to the administration and was documented to contain 8.550 GBq (231.1 mCi) of Y-90. The nuclear medicine technologist failed to compare the measured activity of Y-90 from the dose calibrator with the activity of Y-90 that was required to administer the planned dose to the right lobe of the liver, and therefore did not identify the discrepancy in activity. Before administering the vial of Y-90 to the patient, the AU did not verify that the activity of the Y-90 prepared by the nuclear medicine technologist was consistent with the activity required to administer the planned radiation dose. Following the administration of the incorrect activity of Y-90 to the patient, the written directive was prepared and the error was identified.

Actions Taken To Prevent Recurrence Licensee Corrective actions included (1) temporarily suspending all Y-90 procedures until the licensee reviewed the event, (2) reinforcing the regulatory requirements for having properly prepared, dated, and signed written directives before the administration of Y-90, (3) providing additional specific training from the Y-90 microsphere manufacturer/vendor to appropriate staff (nuclear medicine technicians, authorized users and auxiliary staff), (4) developing a standard operating procedure for the ordering of Y-90 doses and the preparation of Y-90 for administration, including revising procedures and forms used to order Y-90 doses, (5) using timeouts for verification purposes during the Y-90 administration process, and (6) performing a 12

simulation/dry run before the resumption of Y-90 procedures. The licensee reported that they resumed Y-90 microsphere procedures on August 9, 2017, without incident.

NRC The NRC conducted a reactive inspection of the reported event and an independent review of the causal factors that led to the medical event. Additionally, the NRC contracted with a physician and a medical consultant to perform an independent determination of potential adverse effects on the patient. The NRC is currently reviewing the supplemental information provided by the licensee and the information from the NRCs medical consultants. The inspection effort is ongoing.

This event is open for the purpose of this report.

13

AS17-06 Medical Event at Mayo Clinic, Jacksonville, Florida Criterion III.C.1.b and III.C.2.a, For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is at least 50 percent greater than that prescribed.

Date and Place July 28, 2017, Jacksonville, FL Nature and Probable Consequences On July 28, 2017, a patient underwent Y-90 microsphere brachytherapy for liver volume ablation. The AU prescribed 630 MBq (17 mCi) to the left lobe of the patients liver for a total dose of 33,810 cGy (rad).

To achieve the prescribed dose, the volume of Y-90 needed for administration was calculated based on the decay difference between the vial calibration date and the treatment date listed on the final treatment plan. The scheduling nurse scheduled the patient for Friday, July 28, 2017, instead of Monday, July 31, 2017, when the final treatment plan listed that the procedure would take place.

On the day of the procedure, neither the pretreatment calculations performed by the physicist nor the timeout required by the licensees procedures caught the change in treatment date. The half-life of Y-90 is 2.6 days, so the administered radioactivity on July 28 was twice as high as it would have been if administered on July 31.

The error was discovered when the residual waste container was surveyed immediately following treatment. The completed survey showed that the dose variation was high, and calculations performed by the licensee after the survey indicated that the patient received a total dosage of 1,500 MBq (40.56 mCi), which resulted in a dose of 80,780 cGy (rad) to the liver instead of the prescribed dosage of 630 MBq (17 mCi) or 33,810 cGy (rad).

The patient and referring physician were notified of the incident. The licensee reported that no adverse health effects are expected as a result of the additional dose. At the time of the treatment, the activity being administered, although high, was within practice standards for an ablative treatment. Because of the range for this type of treatment, the dosage did not register as an outlying variation.

Cause The cause of the event was (1) error of the scheduling nurse in scheduling the patient for the procedure based on the pretreatment plan instead of the final treatment plan, and (2) the failure of the physicists pretreatment calculations and the preadministration timeout (to confirm the ordered vial calibration activity and calibration date) to notice the change in treatment date.

Actions Taken To Prevent Recurrence Licensee The AUs use an electronic spreadsheet to calculate the patient radiation dose.

This spreadsheet was modified to include a check to compare the number of days between the Y-90 calibration date and the treatment administration date to the Y-90 decay days used for treatment planning. If the values do not agree, the spreadsheet displays an error message.

Additionally, the licensee added a step to its preadministration timeout procedure to include confirmation of the dose vial calibration activity, calibration date, and the administration date 14

according to the written directive. All licensee staff members who handle Y-90 treatments received training on the revised spreadsheet and procedure.

State The Florida Bureau of Radiation Control inspected the licensee September 18-20, 2017, and issued no violations.

This event is closed for the purpose of this report.

15

NRC17-05 Medical Event at Washington University in St. Louis, St. Louis, Missouri Criterion III.C.1.b and III.C.2.b(iii), For Medical Licensees, of Appendix A provide, in part, that a medical event shall be considered an AO if it results in a dose equal to or greater than 10 Gy (1,000 rad) to any organ or tissue (other than a major portion of the bone marrow, or the lens of the eye, or the gonads) and represents a prescribed dose or dosage that is delivered to the wrong treatment site.

Date and Place August 18, 2017, St. Louis, MO Nature and Probable Consequences On August 18, 2017, Washington University in St. Louis treated a patient with Y-90 microsphere brachytherapy for liver cancer. The AU prescribed 124 Gy (12,400 rad) by administering 1.74 GBq (47.03 mCi) to the left lobe of the liver. During the treatment, the interventional radiologist incorrectly placed the catheter in the right hepatic artery. The licensee inadvertently administered 1.71 GBq (46.2 mCi) to the right lobe of the patients liver via the right hepatic artery. The catheter placement resulted in a dose to the right (unintended) lobe of the liver of 61 Gy (6,100 rad). The patient and prescribing physician were notified of this event. Because the right lobe was also scheduled to receive treatment, the licensee does not expect any adverse health effects from this event.

Cause(s) The NRC inspectors determined that the cause of the medical event was human error. The interventional radiologist mistakenly thought that the treatment site was the right lobe of the patients liver, and he did not verify this assumption against the patients treatment plan.

Actions Taken To Prevent Recurrence Licensee The licensee implemented the generic corrective actions as listed in the NRC17-01 abnormal occurrence event as reported on page 4 of this report. Corrective actions included increased communications between therapy staff and verification of the written directive.

Specifically, the licensee revised its written directive procedure to include a review of the patient treatment plan immediately prior to a procedure.

NRC The NRC performed a reactive inspection to review the circumstances, root and contributing causes, and proposed corrective actions. The NRC has agreed with the licensees corrective actions.

This event is closed for the purpose of this report.

16

APPENDIX A ABNORMAL OCCURRENCE CRITERIA AND GUIDELINES FOR OTHER EVENTS OF INTEREST An incident or event will be considered an abnormal occurrence (AO) if it involves a major reduction in the degree of protection of public health or safety. This type of incident or event would have a moderate or severe impact on public health or safety and could include, but need not be limited to, the following:

(1) moderate exposure to, or release of, radioactive material licensed by or otherwise regulated by the Commission:

(2) major degradation of essential safety-related equipment; and (3) major deficiencies in design, construction, use of, or management controls for facilities or radioactive material licensed by or otherwise regulated by the Commission.

The U.S. Nuclear Regulatory Commission (NRC) identified the following criteria for determining an AO and the guidelines for other events of interest in a policy statement published in the Federal Register on October 12, 2006 (71 FR 60198).

Abnormal Occurrence Criteria The NRC uses the following criteria to determine whether to consider events for reporting as AOs:

I. For All Licensees A. Human Exposure to Radiation from Licensed Material

1. Any unintended radiation exposure to an adult (any individual 18 years of age or older) resulting in an annual total effective dose equivalent (TEDE) of 250 millisievert (mSv) [25 roentgen equivalent man (rem)] or more; or an annual sum of the deep dose equivalent (external dose) and committed dose equivalent (intake of radioactive material) to any individual organ other than the lens of the eye, the bone marrow, and the gonads of 2,500 mSv (250 rem) or more; or an annual dose equivalent to the lens of the eye of 1 Sievert (Sv) (100 rem) or more; or an annual sum of the deep dose equivalent and committed dose equivalent to the bone marrow of 1 Sv (100 rem) or more; or a committed dose equivalent to the gonads of 2,500 mSv (250 rem) or more; or an annual shallow-dose equivalent to the skin or extremities of 2,500 mSv (250 rem) or more.

2. Any unintended radiation exposure to any minor (an individual less than 18 years of age) resulting in an annual TEDE of 50 mSv (5 rem) or more, or to an embryo/fetus resulting in a dose equivalent of 50 mSv (5 rem) or more.

A-1

3. Any radiation exposure that has resulted in unintended permanent functional damage to an organ or a physiological system as determined by a physician.

B. Discharge or dispersal of radioactive material from its intended place of confinement which results in the release of radioactive material to an unrestricted area in concentrations which, if averaged over a period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, exceeds 5,000 times the values specified in Table 2 of Appendix B, Annual Limits on Intake (ALIs) and Derived Air Concentrations (DACs) of Radionuclides for Occupational Exposure; Effluent Concentrations; Concentrations for Release to Sewerage, to Part 20 of Title 10 of the Code of Federal Regulations (10 CFR),

Standards for Protection against Radiation, unless the licensee has demonstrated compliance with 10 CFR 20.1301, Dose Limits for Individual Members of the Public, using 10 CFR 20.1302(b)(1) or 10 CFR 20.1302(b)(2)(ii).

This criterion does not apply to transportation events.

C. Theft, Diversion, or Loss of Licensed Material, or Sabotage or Security Breach1, 2

1. Any unrecovered lost, stolen, or abandoned sources that exceed the values listed in Appendix P to 10 CFR Part 110, Category 1 and 2 Radioactive Material. Excluded from reporting under this criterion are those events involving sources that are lost, stolen, or abandoned under the following conditions: sources abandoned in accordance with the requirements of 10 CFR 39.77(c); sealed sources contained in labeled, rugged source housings; recovered sources with sufficient indication that doses in excess of the reporting thresholds specified in AO criteria I.A.1 and I.A.2 did not occur while the source was missing; and unrecoverable sources (sources that have been lost and for which a reasonable attempt at recovery has been made without success) lost under such conditions that doses in excess of the reporting thresholds specified in AO criteria I.A.1 and I.A.2 are not known to have occurred and the agency has determined that the risk of theft or diversion is acceptably low.

1 Information pertaining to certain incidents may be either classified or under consideration for classification because of national security implications. Classified information will be withheld when formally reporting these incidents in accordance with Section 208 of the Energy Reorganization Act of 1974, as amended. Any classified details regarding these incidents would be available to the Congress, upon request, under appropriate security arrangements.

2 Due to increased terrorist activities worldwide, this report does not disclose specific classified information and sensitive information, the details of which are considered useful to a potential terrorist.

Classified information is defined as information that would harm national security if disclosed in an unauthorized manner.

A-2

2. A substantiated3 case of actual theft or diversion of licensed, risk-significant radioactive sources or a formula quantity4 of special nuclear material; or act that results in radiological sabotage.5

3. Any substantiated3 loss of a formula quantity4 of special nuclear material or a substantiated3 inventory discrepancy of a formula quantity4 of special nuclear material that is judged to be caused by theft or diversion or by a substantial breakdown6 of the accountability system.

4. Any substantial breakdown6 of physical security or material control (i.e., access control containment or accountability systems) that significantly weakened the protection against theft, diversion, or sabotage.

5. Any significant unauthorized disclosures (loss, theft, and/or deliberate) of classified information that harms national security or safeguards information that harms the public health and safety.

D. Initiation of High-Level NRC Team Inspection.7 II. For Commercial Nuclear Power Plant Licensees A. Malfunction of Facility, Structures, or Equipment

1. Exceeding a safety limit of license technical specification (TS)

[10 CFR 50.36(c)].

2. Serious degradation of fuel integrity, primary coolant pressure boundary, or primary containment boundary.

3. Loss of plant capability to perform essential safety functions so that a release of radioactive materials which could result in exceeding the dose limits of 10 CFR Part 100, Reactor Site Criteria, or 5 times the dose limits of 10 CFR Part 50, Domestic Licensing of Production and Utilization Facilities, Appendix A, General Design Criterion for Nuclear Power Plants, General Design Criterion (GDC) 19, Control Room, could occur from a postulated transient or accident (e.g., loss of emergency core cooling system, loss of control rod system).

3 Substantiated means a situation where an indication of loss, theft, or unlawful diversion such as: an allegation of diversion, report of lost or stolen material, statistical processing difference, or other indication of loss of material control or accountability cannot be refuted following an investigation; and requires further action on the part of the agency or other proper authorities.

4 A formula quantity of special nuclear material is defined in 10 CFR 70.-4, Definitions.

5 Radiological sabotage is defined in 10 CFR 73.-2, Definitions.

6 A substantial breakdown is defined as a red finding in the security inspection program, or any plant or facility determined to have overall unacceptable performance, or in a shutdown condition (inimical to the effective functioning of the nations critical infrastructure) as a result of significant performance problems and/or operational events.

7 Initiation of any Incident Investigation Teams, as described in NRC Management Directive (MD) 8.3, NRC Incident Investigation Program, or initiation of any accident review groups, as described in MD 8.9, Accident Investigation.

A-3

B. Design or Safety Analysis Deficiency, Personnel Error, or Procedural or Administrative Inadequacy

1. Discovery of a major condition not specifically considered in the safety analysis report (SAR) or TS that requires immediate remedial action.

2. Personnel error or procedural deficiencies that result in loss of plant capability to perform essential safety functions so that a release of radioactive materials which could result in exceeding the dose limits of 10 CFR Part 100 or 5 times the dose limits of 10 CFR Part 50, Appendix A, GDC 19, could occur from a postulated transient or accident (e.g., loss of emergency core cooling system, loss of control rod drive mechanism).

C. Any reactor events or conditions that are determined to be of high safety significance.8 D. Any operating reactor plants that are determined to have overall unacceptable performance or that are in a shutdown condition as a result of significant performance problems and/or operational event(s).9 III. Events at Facilities Other Than Nuclear Power Plants and All Transportation Events A. Events Involving Design, Analysis, Construction, Testing, Operation, Transport, Use, or Disposal of Licensed Facilities or Regulated Materials

1. An accidental criticality [10 CFR 70.52(a)].

2. A major deficiency in design, construction, control, or operation having significant safety implications that require immediate remedial action.

3. A serious safety-significant deficiency in management or procedural controls.

4. A series of events (in which the individual events are not of major importance), recurring incidents, or incidents with implications for similar facilities (generic incidents) that raise a major safety concern.

8 The NRC reactor oversight process (ROP) uses four colors to describe the safety significance of licensee performance. As defined in NRC Management Directive 8.13, Reactor Oversight Process, green is used for very low safety significance, white is used for low to moderate safety significance, yellow is used for substantial safety significance, and red is used for high safety significance. Reactor conditions or performance indicators evaluated to be red are considered abnormal occurrences. Additionally, Criterion II.C also includes any events or conditions evaluated by the NRC ASP program to have a conditional core damage probability (CCDP) or change in core damage probability (CDP) of greater than 1x10-3.

9 Any plants assessed by the ROP to be in the unacceptable performance column, as described in NRC Inspection Manual Chapter 0305, Operating Reactor Assessment Program. This assessment of safety performance is based on the number and significance of NRC inspection findings and licensee performance indicators.

A-4

B. For Fuel Cycle Facilities

1. Absence or failure of all safety-related or security-related controls (engineered and human) for an NRC-regulated lethal hazard (radiological or chemical) while the lethal hazard is present.

2. An NRC-ordered safety-related or security-related immediate remedial action.

C. For Medical Licensees A medical event that:

1. Results in a dose that is

a. Equal to or greater than 1 gray (Gy) (100 rad) to a major portion of the bone marrow or to the lens of the eye; or equal or greater than 2.5 Gy (250 rad) to the gonads; or

b. Equal to or greater than 10 Gy (1,000 rad) to any other organ or tissue; and

2. Represents either

a. A dose or dosage that is at least 50 percent greater than that prescribed, or

b. A prescribed dose or dosage that (i) Uses the wrong radiopharmaceutical or unsealed byproduct material; or (ii) Is delivered by the wrong route of administration; or (iii) Is delivered to the wrong treatment site; or (iv) Is delivered by the wrong treatment mode; or (v) Is from a leaking source or sources; or (vi) Is delivered to the wrong individual or human research subject.

IV. Other Events of Interest The Commission may determine that events other than AOs may be of interest to Congress and the public and should be included in an appendix to the AO report as Other Events of Interest. Such events may include, but are not necessarily limited to, events that do not meet the AO criteria but that have been perceived by Congress or the public to be of high health and safety significance, have received significant media A-5

coverage, or have caused the NRC to increase its attention to or oversight of a program area, or a group of similar events that have resulted in licensed materials entering the public domain in an uncontrolled manner.

A-6

APPENDIX B UPDATES OF PREVIOUSLY REPORTED ABNORMAL OCCURRENCES During this reporting period, updated information became available for one abnormal occurrence event that the U.S. Nuclear Regulatory Commission reported in NUREG-0090, Volume 39, Report to Congress on Abnormal Occurrences: Fiscal Year 2016, issued May 2017. This AO involved a medical event at Legacy Good Samaritan Medical Center in Portland, Oregon.

Medical Events at Legacy Good Samaritan Medical Center, Portland, Oregon (previously reported as AS15-08 in NUREG-0090, Volume 38, issued May 2016, and in Appendix B to NUREG-0090, Volume 39, issued May 2017)

Date and Place January 7, 2015, to February 12, 2015, Portland, OR Background Legacy Good Samaritan Medical Center reported eight medical events associated with a gamma knife stereotactic radiosurgery unit that occurred between January 7, 2015, and February 12, 2015. Five of these events exceeded the 10-gray (Gy) (1,000-rad) dose threshold in the AO criterion. All eight patients received the prescribed dose, ranging from 7 to 24.9 Gy (700 to 2,490 rad), to the wrong location because of the manufacturers misalignment of the patient positioning system (PPS) during maintenance that was performed on the unit between December 13, 2014, and January 1, 2015. The cause of the misalignment was human error resulting from an Elekta field service engineers failure to follow correct procedures. As a result of the maintenance, the PPS was off target by 1.87 millimeters, causing the medical events. Following the event, the licensee established a new set of quality assurance tests, with the cooperation of Elekta (the manufacturer), to verify positioning.

Update on Actions Taken To Prevent Recurrence State The State of Oregon, Oregon Health Authority, Radiation Protection Services (RPS) completed a comprehensive investigation of the eight medical events. RPS revised its inspection focus to evaluate the following three areas:

(1) a reconstruction of the sequence of events leading to the misalignment of the PPS (2) adequacy of Elektas onboarding and training processes for the field service engineer who performed the misalignment (3) adequacy of the applicable regulatory authoritys regulations and license conditions RPS identified the following as contributing factors:

• manufacturer service technician qualification, evaluation, and training

• communication and expectation issues among Elektas field service technician, technical advisory group, and management Legacy Good Samaritan has implemented corrective actions to ensure proper therapy alignment and address patient health and safety. RPS is evaluating both Federal regulations and Oregon Administrative Rules to determine if violations occurred.

This event is closed for the purpose of this report.

B-1

APPENDIX C OTHER EVENTS OF INTEREST This appendix discusses other events of interest that do not meet the abnormal occurrence (AO) criteria in Appendix A but that have been perceived by Congress or the public to be of high health and safety significance, have received significant media coverage, or have caused the U.S. Nuclear Regulatory Commission to increase its attention to or oversight of a program area.

This appendix includes updates to other events of interest reported in previous AO reports to Congress.

OEI 17-01 Human Exposure Event at the Department of Commerce, National Institute of Standards and Technology, Gaithersburg, Maryland Date and Place August 18, 2017, Gaithersburg, MD This event involved a positive bioassay result on an individual who was exposed to a broken ampoule containing 1.27 mCi of americium-241. On August 18, 2017, the U.S. Department of Commerce, National Institute of Standards and Technology (NIST), discovered that a flame-sealed glass ampoule that contained a well-characterized solution of amercium-241 with an activity of 47 MBq (1.27 mCi) had been broken. The activity was in a solution. The broken ampoule resulted in radioactive contamination of the countertop and other surfaces of a lead-shielded storage area within a room of the Gaithersburg campus. The contamination was discovered after wipe test results identified alpha contamination on a beta/gamma source located in the same storage area. NIST performed extensive surveys of the area and air monitoring and confirmed that the contamination was isolated to portions of that one room.

NIST issued a stop work order for all other laboratories storing similar ampoules until the extent of the condition was evaluated or mitigated. NIST performed and received three bioassay results from personnel who were determined to be the most likely to be exposed to the contamination. One of the bioassays indicated that the individual was exposed. NIST consulted with the Oak Ridge Associated Universities Radiation Emergency Assistance Center/Training Site (REAC/TS) program to perform additional analysis of the individual. The NRCs Region I Office initiated a special inspection at the facility on September 26, 2017. The inspection is ongoing.

C-1

APPENDIX D GLOSSARY Ablation 2 removal or excision. Ablation is usually carried out surgically. For example, surgical removal of the thyroid gland (a total thyroidectomy) is ablation of the thyroid.

Act the Atomic Energy Act of 1954 (Public Law 83-703), including any amendments.

Ampoule2 a sealed glass capsule containing a liquid, especially a measured quantity ready for injecting.

Angiogram2 a radiograph made by the radiographic visualization of the blood vessels after injection of a radiopaque substance.

Authorized user as defined in Title 10 of the Code of Federal Regulations (10 CFR) 35.2, Definitions, a physician, dentist, or podiatrist who (1) meets the requirements in 10 CFR 35.59, Recentness of Training, and 10 CFR 35.190(a), 10 CFR 35.290(a), 10 CFR 35.390(a),

10 CFR 35.392(a), 10 CFR 35.394(a), 10 CFR 35.490(a), 10 CFR 35.590(a), or 10 CFR 35.690(a); or (2) is identified as an authorized user on (i) a Commission or Agreement State license that authorizes the medical use of byproduct material, (ii) a permit issued by a Commission master material licensee that is authorized to permit the medical use of byproduct material, (iii) a permit issued by a Commission or Agreement State specific licensee of broad scope that is authorized to permit the medical use of byproduct material, or (iv) a permit issued by a Commission master material license broad scope permittee that is authorized to permit the medical use of byproduct material.

Bioassay2 - determination of kinds, quantities, or concentrations and, in some cases, locations of radioactive material in the human body, whether by direct measurement (in vivo counting) or by analysis and evaluation of materials excreted or removed (in vitro) from the human body.

Brachytherapy as defined in 10 CFR 35.2, a method of radiation therapy in which sources are used to deliver a radiation dose at a distance of up to a few centimeters by surface, intracavitary, intraluminal, or interstitial application.

Brachytherapy seed implantation for prostate cancer2 Radioactive seed implants are a form of radiation therapy for prostate cancer. The radioactive seeds are loaded into the designated number of needles, in a specific order, and each needle is inserted through the skin in the perineum and into the prostate using continuous ultrasound guidance. Once accurate needle placement is confirmed, the seeds in that needle are released. This process is continued until all of the radioactive seeds have been implanted.

Brachytherapy source as defined in 10 CFR 35.2, a radioactive source or a manufacturer-assembled source train or a combination of these sources that is designed to deliver a therapeutic dose within a distance of a few centimeters.

2 These terms are not defined in Title 10 of the Code of Federal Regulations (10 CFR), a management directive (MD), an inspection procedure, or a U.S. Nuclear Regulatory Commission (NRC) policy statement.

These definitions are based on those in Merriam-Websters MedlinePlus Online Medical Dictionary.

MedlinePlus is a service of the U.S. National Library of Medicine and the National Institutes of Health (see https://medlineplus.gov/mplusdictionary.html).

D-1

Catheter 2 a tubular medical device for insertion into canals, vessels, passageways, or body cavities for diagnostic or therapeutic purposes to permit injection or withdrawal of fluids or to keep a passage open.

Dose equivalent (HT) as defined in 10 CFR 20.1003, Definitions, the product of the absorbed dose in tissue, quality factor, and all other necessary modifying factors at the location of interest; the units of dose equivalent are the roentgen equivalent man (rem) and Sievert (Sv).

Effective dose equivalent (HE) as defined in 10 CFR 20.1003, the sum of the products of the dose equivalent to the organ or tissue (HT) and the weighting factors (wT) applicable to each of the body organs or tissues that are irradiated.

Exposure as defined in 10 CFR 20.1003, being exposed to ionizing radiation or to radioactive material.

External dose as defined in 10 CFR 20.1003, that portion of the dose equivalent received from radiation sources outside the body.

Gamma knife a type of radiosurgery (radiation therapy) machine that acts by focusing low-dosage gamma radiation from many sources on a precise target. Areas adjacent to the target receive only slight doses of radiation, while the target gets the full intensity.

Gray (Gy) as defined in 10 CFR 20.1004, Units of Radiation Dose, the international systems unit of absorbed dose; 1 gray is equal to an absorbed dose of 1 joule per kilogram (100 rad).

Hypothyrodism2 deficient activity of the thyroid gland; also a resultant bodily condition characterized by lowered metabolic rate and general loss of vigor.

Interstitial2 situated within, but not restricted to or characteristic of, a particular organ or tissue; used especially of fibrous tissue.

Manual brachytherapy as defined in 10 CFR 35.2, a type of brachytherapy in which the brachytherapy sources (e.g., seeds, ribbons) are manually placed topically on or inserted either into the body cavities that are close to a treatment site or directly into the tissue volume.

Medical event as defined in 10 CFR 35.2, an event that meets the criteria in 10 CFR 35.3045(a) or (b). Regulations in 10 CFR 35.3045(a) state that a licensee shall report any event, except for an event that results from patient intervention, in which the administration of byproduct material or radiation from byproduct material results in one of the following:

(1) A dose that differs from the prescribed dose or dose that would have resulted from the prescribed dosage by more than 0.05 Sv (5 rem) effective dose equivalent, 0.5 Sv (50 rem) to an organ or tissue, or 0.5 Sv (50 rem) shallow dose equivalent to the skin and (i) the total dose delivered differs from the prescribed dose by 20 percent or more; (ii) the total dosage delivered differs from the prescribed dosage by 20 percent or more or falls outside the prescribed dosage range; or (iii) the fractionated dose delivered differs from the prescribed dose, for a single fraction, by 50 percent or more.

D-2

(2) A dose that exceeds 0.05 Sv (5 rem) effective dose equivalent, 0.5 Sv (50 rem) to an organ or tissue, or 0.5 Sv (50 rem) shallow dose equivalent to the skin from any of the following: (i) an administration of a wrong radioactive drug containing byproduct material; (ii) an administration of a radioactive drug containing byproduct material by the wrong route of administration; (iii) an administration of a dose or dosage to the wrong individual or human research subject; (iv) an administration of a dose or dosage delivered by the wrong mode of treatment; or (v) a leaking sealed source.

(3) A dose to the skin or an organ or tissue other than the treatment site that exceeds by 0.5 Sv (50 rem) to an organ or tissue and 50 percent or more of the dose expected from the administration defined in the written directive (excluding, for permanent implants, seeds that were implanted in the correct site but migrated outside the treatment site).

Regulations in 10 CFR 35.3045(b) state that a licensee shall report any event resulting from intervention of a patient or human research subject in which the administration of byproduct material or radiation from byproduct material results or will result in unintended permanent functional damage to an organ or a physiological system, as determined by a physician.

Metastasis2 the spread of a disease-producing agent (such as cancer cells or bacteria) or disease from the initial or primary site of disease to another part of the body.

Prescribed dosage as defined in 10 CFR 35.2, the specified activity or range of activity of unsealed byproduct material as documented (1) in a written directive or (2) in accordance with the directions of the authorized user for procedures performed pursuant to 10 CFR 35.100, Use of Unsealed Byproduct Material for Uptake, Dilution, and Excretion Studies for Which a Written Directive Is Not Required, and 10 CFR 35.200, Use of Unsealed Byproduct Material for Imaging and Localization Studies for Which a Written Directive Is Not Required.

Neuroendrocrine2 of, relating to, or being a hormonal substance that influences the activity of nerves and of, relating to, or functioning in neurosecretion.

Prescribed dose as defined in 10 CFR 35.2: (1) for gamma stereotactic radiosurgery, the total dose as documented in the written directive, (2) for teletherapy, the total dose and dose per fraction as documented in the written directive, (3) for manual brachytherapy, either the total source strength and exposure time or the total dose, as documented in the written directive, or (4) for remote brachytherapy afterloaders, the total dose and dose per fraction as documented in the written directive.

rad as defined in 10 CFR 20.1004, the special unit of absorbed dose; 1 rad is equal to an absorbed dose of 100 ergs/gram or 0.01 joule/kilogram (0.01 gray).

Radiation (ionizing radiation) as defined in 10 CFR 20.1003, alpha particles, beta particles, gamma rays, x-rays, neutrons, high-speed electrons, high-speed protons, and other particles capable of producing ions. Radiation, as used in 10 CFR Part 20, Standards for Protection against Radiation, does not include nonionizing radiation, such as radio waves or microwaves, or visible, infrared, or ultraviolet light.

D-3

Radiation therapy (radiotherapy)2 treatment in which high-energy rays are used to damage cancer cells and stop them from growing and dividing.

Reactive inspection as defined in NRC Inspection Manual Chapter 2800 Materials Inspection Program, and Management Directive 8.10 as an inspection performed for the purpose of obtaining additional information in response to an event.

rem as defined in 10 CFR 20.1004, the special unit of any of the quantities expressed as dose equivalent; the dose equivalent in rem is equal to the absorbed dose in rad multiplied by the quality factor (1 rem = 0.01 Sievert).

Shallow dose equivalent (HS) as defined in 10 CFR 20.1003, which applies to the external exposure of the skin of the whole body or the skin of an extremity, the dose equivalent at a tissue depth of 0.007 centimeter (7 milligrams/square centimeter).

Sievert (Sv) as defined in 10 CFR 20.1004, the International Systems unit of any of the quantities expressed as dose equivalent; the dose equivalent in Sieverts is equal to the absorbed dose in grays multiplied by the quality factor (1 Sv = 100 rem).

Source material as defined in 10 CFR 40.4, Definitions: (1) uranium or thorium, or any combination thereof, in any physical or chemical form, or (2) ores that contain by weight 1/20th of 1 percent (0.05 percent) or more of (i) uranium, (ii) thorium, or (iii) any combination thereof.

Source material does not include special nuclear material.

Special nuclear material as defined in 10 CFR 70.4, Definitions: (1) plutonium, uranium-233, uranium enriched in the isotope 233 or in the isotope 235, and any other material that the Commission, pursuant to the provisions of Section 51, Special Nuclear Material, of the Atomic Energy Act of 1954, as amended, determines to be special nuclear material, but not including source material, or (2) any material artificially enriched by any of the foregoing but not including source material.

Stereotactic radiosurgery as defined in 10 CFR 35.2, the use of external radiation in conjunction with a stereotactic guidance device to very precisely deliver a therapeutic dose to a tissue volume.

Therapeutic dose as defined in 10 CFR 35.2, a radiation dose delivered from a source containing byproduct material to a patient or human research subject for palliative or curative treatment.

Treatment site as defined in 10 CFR 35.2, the anatomical description of the tissue intended to receive a radiation dose, as described in a written directive.

Written directive as defined in 10 CFR 35.2, an authorized users written order for the administration of byproduct material or radiation from byproduct material to a specific patient or human research subject, as specified in 10 CFR 35.40, Written Directives.

D-4

APPENDIX E CONVERSION TABLE Radioactivity and Ionizing Radiation QUANTITY FROM METRIC UNITS TO NON-SI UNITS DIVIDE BY (Radionuclide) megabecquerel (MBq) curie (Ci) 37,000 Activity terabecquerel (TBq) Ci 0.037 gigabecquerel (GBq) Ci 37 Absorbed dose gray (Gy) rad 0.01 centigray (cGy) rad 1.0 Dose equivalent Sievert (Sv) roentgen equivalent 0.01 man (rem) centisievert (cSv) rem 1.0 millisievert (mSv) rem 10 mSv millirem (mrem) 0.01 microsievert (µSv) mrem 10 E-1

NUREG-0090, Vol. 40 Report to Congress on Abnormal Occurrences, Fiscal Year 2017 June 2018 Annual Fiscal Year 2017 Division of System Analysis Office of Nuclear Regulatory Research U.S. Nuclear Regulatory Commission Washington, DC 20555-001 Same as above NRC Project Manager Vered Anzenberg Shaffer Section 208 of the Energy Reorganization Act of 1974 identifies and abnormal occurrence (AO) an an unscheduled incident or event that the Nuclear Regulatory Commission (NRC) determines to be significant from the standpoint of public health or safety. The Federal Report Elimination and Sunset Act of 1995 requires that the AOs be reported to Congress on an annual basis. This report includes those events that the NRC has determined to be AOs during fiscal year 2017.

This report describes 5 events at NRC-licensed facilities and 6 events at Agreement State-licensed facilities that meet the criteria to be classified as AOs.

Exposure, Dose, Dosage, Medical Event, Fuel Facility, Nuclear Power Reactor

NUREG-0090 Report to Congress on Abnormal Occurrences June 2018 Volume 40 Fiscal Year 2017