ENS Event | |
|---|---|
11:00 Oct 18, 2010 | |
| Title | Stuck Gauge Shutter |
| Event Description | On 10/18/10 at approximately 8:32 am, the site Radiation Safety Officer (RSO) was contacted by a radiation worker at the 80" Hot Strip Mill location, indicating that the shutter on one of the slab detection radiation gauges would not close. The worker was in the process of performing a semi-annual wipe test when the situation was noticed.
The RSO directed site workers to barricade the area until he arrived. Upon arrival, the RSO conducted a survey of the area, compared the levels to a prior survey and found no significant difference in radiation levels. The RSO also performed a wipe test on the gauge and checked it with a survey meter and pancake probe, finding no detectable contamination. The radiation worker was directed to check the device counts using a survey meter and to compare them to counts on an adjacent gauge. The counts were similar, indicating proper function. A melted metallic material was noted adjacent to the gauge whose shutter would not close. The material was analyzed and it showed to be 90-95% lead. As a result, it is believed some shielding may have overheated and blocked the shutter open or debris entered the shutter arm blocking it from closing. Although radiation levels in the area are normal, the RSO will attempt to safely remove the gauge to a secure location until the device can be serviced by the manufacturer. The Cs-137 source is S/N 6326CM of a slab detection device manufactured by Ronan Engineering. |
| Where | |
|---|---|
| Arcelormittal Burns Harbor Burns Harbor, Indiana (NRC Region 3) | |
| License number: | 13-32670-01 |
| Organization: | Arcelormittal Burns Harbor |
| Reporting | |
| 10 CFR 30.50(b)(2), Licensed Material Protection Equipment Failure | |
| Time - Person (Reporting Time:+2.63 h0.11 days <br />0.0157 weeks <br />0.0036 months <br />) | |
| Opened: | Chris Sarvanidis 13:38 Oct 18, 2010 |
| NRC Officer: | Eric Simpson |
| Last Updated: | Oct 18, 2010 |
| 46341 - NRC Website | |
Arcelormittal Burns Harbor with 10 CFR 30.50(b)(2) | |
WEEKMONTHYEARENS 511222015-06-04T12:30:0004 June 2015 12:30:00
[Table view]10 CFR 30.50(b)(2) Stuck Gauge Shutter ENS 463412010-10-18T11:00:00018 October 2010 11:00:00 10 CFR 30.50(b)(2) Stuck Gauge Shutter ENS 462052010-08-24T14:15:00024 August 2010 14:15:00 10 CFR 30.50(b)(2) Level Detection Gauge Shutter Control Rod Disengaged ENS 461542010-07-22T06:30:00022 July 2010 06:30:00 10 CFR 30.50(b)(2) Nuclear Gauge Dislodged from Steel Caster and Later Retrieved 2015-06-04T12:30:00 | |