ML18213A116
| ML18213A116 | |
| Person / Time | |
|---|---|
| Issue date: | 07/25/2018 |
| From: | Patricia Milligan NRC/NSIR/DPR |
| To: | DBI |
| Rivera-Capella G | |
| References | |
| EN53510 | |
| Download: ML18213A116 (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: 2015-05-06 Location / Facility: Overland Park, Kansas / DBI, INC.
Event Country: United States of America Event Type: Radiation Source INES Rating: 2 - Incident (Final)
Rating Date: 2018-07-25 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 On 5/6/2015, a worker received an extremity overexposure while conducting radiographic operations at an industrial facility. A radio communication that occurred while the radiographer was relocating the collimator was misunderstood by the radiographer assistant as direction to crank out the 2.59 TBq (70 Ci) Ir-192 source. When the radiographer felt the vibration of the source being cranked out, he dropped the collimator, exited the area, and retracted the source into the exposure device. Upon badge processing results and worst case scenario calculations, it was determined that the radiographer received an extremity exposure of between 500 and 1,000 mSv (50 and 100 rem). The licensee monitored the radiographer's hands until 6/20/2015. No signs of radiation exposure were observed. The radiographer's year-to-date annual dose was 2.62 mSv (262 mrem). The root cause was determined to be communication weakness. Employees were informed of the incident and reminded of the importance of a visual confirmation prior to exposing the source, which has been implemented into the licensees protocol. The dose received is or exceeds the U.S. statutory limit for extremity dose of 500 mSv (50 rem). NRC EN53510 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