ENS Event | |
|---|---|
12:00 Oct 9, 2025 | |
| Title | Gauge Shutter Failure |
| Event Description | The following information was provided by the Minnesota Department of Health (MDH) via email:
The radiation safety officer (RSO) was attempting to lock-out an Ohmart, Cs-137 fixed gauge when they found that the shutter was stuck open. The RSO stated that while trying to close the shutter, they chipped it. At that point, they removed the gauge and attempted to close the shutter in their workshop and were still unsuccessful. The RSO stated that, during continued attempts to close the shutter, they further damaged the shutter. At this point, the RSO fixed a 6-inch steel plate over the beam and put the device in storage. The RSO took surveys and determined the source was adequately shielded. The device will remain in storage, and the gauge manufacturer will be consulted for next steps. The RSO reported the event to MDH at approximately 1200 CDT on October 9, 2025. Manufacturer: Ohmart Model: unknown at this time Source: Cs-137 Activity: approximately 80 millicuries Minnesota Event ID: MN250007 |
| Where | |
|---|---|
| Cleveland Cliffs Minorca Mine Virginia, Minnesota (NRC Region 3) | |
| License number: | 1088 |
| Organization: | Minnesota Department Of Health |
| Reporting | |
| Agreement State | |
| Time - Person (Reporting Time:+4.38 h0.183 days <br />0.0261 weeks <br />0.006 months <br />) | |
| Opened: | John Miller 16:23 Oct 9, 2025 |
| NRC Officer: | Sam Colvard |
| Last Updated: | Oct 10, 2025 |
| 57976 - NRC Website | |
Cleveland Cliffs Minorca Mine with Agreement State | |
WEEKMONTHYEARENS 579762025-10-09T12:00:0009 October 2025 12:00:00
[Table view]Agreement State Gauge Shutter Failure 2025-10-09T12:00:00 | |