ML18037A618
| ML18037A618 | |
| Person / Time | |
|---|---|
| Issue date: | 02/06/2018 |
| From: | Patricia Milligan Office of Nuclear Security and Incident Response |
| To: | |
| Rivera-Capella G | |
| References | |
| EN 53144 | |
| Download: ML18037A618 (1) | |
Text
Posted by: Patricia Milligan, Nuclear Regulatory Commission (NRC), United States of America INES Event Rating Form (ERF)
Version 1 Sender's Name: Patricia Milligan Sender's Organization: Nuclear Regulatory Commission (NRC) (United States of America)
Event
Title:
Worker Overexposure Event Date: 2017-12-01 Location / Facility: Buford Georgia / Theragenics Corporation Event Country: United States of America Event Type: Irradiation/Accelerator Facility INES Rating: 2 - Incident (Final)
Rating Date: 2018-01-19 Impact on people and the environment Release beyond authorized limits? No Overexposure of a member of the public? No Overexposure of a worker? Yes Impact on the radiological barriers and controls at facilities Contamination spread within the facility? No Damage to radiological barriers (incl. fuel damage) within the facility? No Degradation of Defence In-Depth? No Other information Person injured physically or casualty? No Is there a continuing problem? No Event Description A cyclotron technician received 719 mSv (71.9 rem) to the left hand for the period of 11/6/2017 to 11/19/2017. The licensee contributed the dose to one of two instances that occurred during this period of time. 1) The technician worked on cleaning and rebuilding the central region of a cyclotron, for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 2) The technician had difficulty operating the manipulator arms and pneumatic screwdriver within a hot cell and removed 10 screws in the target rail of the hot cell by hand. To date, no effects to the left hand of the technician have been seen. In response to the event the licensee scheduled retraining for employees and developed new procedures. The state of Georgia requested to receive a copy of the procedures once they are finalized. The dose received exceeds the U.S. statutory limit for extremity dose of 500 mSv (50 rem). NRC EN53144 Rating Justification A Level 2 is warranted for exposure of a worker in excess of statutory annual dose limits. See Section 2.3.1 INES Users Manual 2008 Edition (IAEA-INES-2009) http://www-pub.iaea.org/ MTCD/publications/PDF/INES-2009_web.pdf Press Release Attached: No Technical Document Attached: No Further Information on Web:
Contact Person: Patricia Milligan Affiliation: Nuclear Regulatory Commission (NRC)
Email: Patricia.Milligan@nrc.gov Telephone: 0013012873739 Organization on Web: http://www.nrc.gov INES EVENT RATING FORM Page 1 of 1