ENS 47692
ENS Event | |
|---|---|
05:00 Jan 31, 2012 | |
| Title | Agreement State Report - Contamination Levels Exceed Action Levels |
| Event Description | The following was received from the Commonwealth of Massachusetts via facsimile:
On Tuesday, 1/31/12, routine contamination surveys discovered approximately 0.5 nCi of Ir-192 outside of the restricted area on the first floor. The calculated dose for an 8-hour exposure to this RAM is 0.7 mrem. The contamination survey results prompted QSA to perform additional surveys to determine the source of contamination. Survey wipes yielded 10,000 to 30,000 dpm over large areas (approximately 2 feet x 2 feet) at different locations. Upon investigation, QSA discovered that the exhaust fan on the Ir-192 source production hot cell had been turned 'off.' The exhaust fan was immediately turned back 'on.' About one week earlier, Ir-192 from a supplier was transferred into the hot cell. This operation requires the hot cell exhaust fan to be turned 'off' temporarily. QSA realized that the exhaust fan had not been turned back 'on.' Radiation workers who performed hot cell production operations during the time the exhaust fan was 'off' were subjected to whole body counts performed at MIT. The whole body counts indicated workers ingested 12 to 20 nCi of Ir-192 and based on the MIT results, the RSO calculated the committed dose to be less than 2 mrem. Since the contamination discovery, QSA has performed cleaning operations on the first and second floors, daily survey monitoring of the first and second floors, and radiation workers performing production operations using the Ir-192 hot cell have worn full protective clothing suits. QSA reports daily surveys results indicate contamination levels have steadily decreased. Docket No: 14-0067 |
| Where | |
|---|---|
| Qsa Global Burlington, Massachusetts (NRC Region 1) | |
| License number: | 12-8361 |
| Organization: | Ma Radiation Control Program |
| Reporting | |
| Agreement State | |
| Time - Person (Reporting Time:+555.47 h23.145 days <br />3.306 weeks <br />0.761 months <br />) | |
| Opened: | John Sumares 08:28 Feb 23, 2012 |
| NRC Officer: | Charles Teal |
| Last Updated: | Feb 23, 2012 |
| 47692 - NRC Website | |
Qsa Global with Agreement State | |
WEEKMONTHYEARENS 559162022-05-27T11:50:00027 May 2022 11:50:00
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