ML18094A903
| ML18094A903 | |
| Person / Time | |
|---|---|
| Issue date: | 03/29/2018 |
| From: | Patricia Milligan NRC/NSIR/DPR |
| To: | QUALSPEC |
| Rivera-Capella G | |
| References | |
| EN53283 | |
| Download: ML18094A903 (2) | |
Text
Worker Overexposure Posted on: 29 March 2018 Event Date: 14 March 2018 Event Type: Radiation Source Event Location: United States of America, INES Rating: 2 (Final)
Benicia, California /
Qualspec, LLC A radiographer trainer received a whole body dose of 58 mSv (5.8 rem) on 3/14/2018.
The radiographer assistant received a whole body dose of 46 mSv (4.6 rem). The licensee believes that the radiographers may have received the doses as a result of not fully retracting the 3.3 TBq (88.9 Ci) Ir-192 source back inside the camera after performing a radiography exposure. The licensee also believes that a confirmatory survey was not performed after the exposure, and also that the two radiography personnel did not properly utilize their self-reading dosimeters inasmuch as the high doses were not recognized until their dosimetry of record was routinely processed 3/22/18. The dose received by the radiographer trainer exceeds the U.S. statutory limit for whole body dose of 50 mSv (5 rem). Both radiographers were removed from radiography operations, and are no longer employed by the licensee. As a result of this event, the licensee will strengthen their radiography personnel training and audits, including increasing the frequency of their audits. NRC EN53283 INES Rating: 2 - Incident (Final) as per 29 March 2018 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 Person injured physically or casualty? No Is there a continuing problem? No Justification of Rating A Level 2 is warranted for exposure of a worker in excess of statutory annual dose limits. See 1
Section 2.3.1 INES Users Manual 2008 Edition (IAEA-INES-2009) http://www-pub.iaea.org/
MTCD/publications/PDF/INES-2009_web.pdf Contact Person for Further Information Patricia Milligan 0013012873739 U.S. Nuclear Regulatory Commission Patricia.Milligan@nrc.gov http://www.nrc.gov 2