ENS Event | |
|---|---|
05:00 Jan 24, 2019 | |
| Title | En Revision Imported Date 2/19/2019 |
| Event Description | EN Revision Text: FAILURE TO CLOSE AND LOCK NUCLEAR GAUGE SHUTTER
The following was received via e-mail: Between 2200 EST on January 23, 2019 and 0000 EST on January 24, 2019 a Ronan RLL1 [Density Scale Source] was unbolted from the frame on which it was mounted and placed on the floor. (Source was a Cs-137 0.54 milliCurie decayed to 0.45 milliCurie, Serial #212785A) No permit was pulled to remove the scale source, and the shutter wasn't closed and locked out. After it was unbolted, and was placed on the floor with the beam pointed towards a conveyor belt and the ceiling. Balling line 10, Conveyor 21 was approximately 6 feet above the placed source, and the ceiling is at 60 feet. No employees worked in front of the beam once placed on the floor. No one noticed the scale sitting on the floor unlocked until January 24, 2019 around 1500 EST. Once the source was found, trained personnel put the shutter block in place and locked out the source. The RSO then authorized a permit. Once the source was secured, and permit posted, the RSO did a full investigation. Basic cause - The maintenance employee that unbolted the source entered the area from a direction that could only be accessed during a maintenance down. There was a radiation label on the scale itself, but no sign from his access point.
Based on the findings of an NRC inspector, this event was determined to not be reportable since the shutter was fully functional and no exposure to personal occurred. Notified R3DO (Duncan), NMSS Events Notification Group by email. |
| Where | |
|---|---|
| Tilden Mining Company L.C. Ishpeming, Michigan (NRC Region 3) | |
| License number: | 21-26748-01 |
| Organization: | Tilden Mining Company L.C. |
| Reporting | |
| 10 CFR 30.50(b)(2), Licensed Material Protection Equipment Failure | |
| Time - Person (Reporting Time:+6.23 h0.26 days <br />0.0371 weeks <br />0.00853 months <br />) | |
| Opened: | Lawrence Gray 11:14 Jan 24, 2019 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Feb 18, 2019 |
| 53844 - NRC Website | |
Tilden Mining Company L.C. with 10 CFR 30.50(b)(2) | |
WEEKMONTHYEARENS 538442019-01-24T05:00:00024 January 2019 05:00:00
[Table view]10 CFR 30.50(b)(2) En Revision Imported Date 2/19/2019 ENS 535822017-08-12T04:00:00012 August 2017 04:00:00 10 CFR 30.50(b)(2) En Revision Imported Date 9/17/2018 2019-01-24T05:00:00 | |