ENS Event | |
|---|---|
04:00 Jul 22, 2015 | |
| Title | Agreement State Report - Fixed Gauge with Shutter Stuck Closed |
| Event Description | The following report was received from the State of North Carolina (NC) via email:
The licensee was performing routine maintenance and leak testing checks on a Berthold fixed nuclear density gauge when they discovered its shutter was stuck in the closed position. This maintenance record was dated for 7/22/2015 and listed that the device needed cleaning, showed signs of mild to moderate corrosion, the shutter failed to open, and replacement was necessary. The closed shutter was verified by a survey meter and its detector response. The [North Carolina] State was notified the following week, on 7/27/2015. The gauge manufacturer, Berthold, had already been contracted to dispose of the source and device. No exposures or radiation safety concerns have resulted from this failed shutter at this time and none are expected. The Berthold Fixed Nuclear Gauge is serial #6625, model# LB7440 with a Berthold source serial #1329, model #D7547, 20 mCi Cs-137 source (as of 5/98). The last leak test performed March 28, 2013, that passed according to Thermofisher (3 year leak test requirement). Berthold will perform another leak test before transporting off site. The cause of the stuck shutter is dirt and corrosion products that appear to be the leading cause of the shutter failing in the closed position. NC will follow up with the licensee to determine if dirt accumulation and corrosion occurred by operating in environmental conditions outside of the manufacturer's intentions. NC State report: NC NMED #150022. |
| Where | |
|---|---|
| Domtar Paper Company, Llc Plymouth, North Carolina (NRC Region 1) | |
| License number: | NC RAM #094-0 |
| Organization: | Nc Div Of Radiation Protection |
| Reporting | |
| Agreement State | |
| Time - Person (Reporting Time:+156.98 h6.541 days <br />0.934 weeks <br />0.215 months <br />) | |
| Opened: | David Crowley 16:59 Jul 28, 2015 |
| NRC Officer: | John Shoemaker |
| Last Updated: | Jul 28, 2015 |
| 51273 - NRC Website | |
Domtar Paper Company, Llc with Agreement State | |
WEEKMONTHYEARENS 559342022-03-23T04:00:00023 March 2022 04:00:00
[Table view]Agreement State Stuck Shutters ENS 512732015-07-22T04:00:00022 July 2015 04:00:00 Agreement State Agreement State Report - Fixed Gauge with Shutter Stuck Closed 2022-03-23T04:00:00 | |