ENS Event | |
|---|---|
20:34 Jul 25, 2012 | |
| Title | Unaccounted for Source Range Monitor Detector |
| Event Description | During annual physical inventory of Special Nuclear Material (SNM) conducted at Grand Gulf Nuclear Station (GGNS), a replacement Source Range Monitor (SRM) detector could not be accounted for. The SRM detector was being stored in the refuel floor storage locker after maintenance activities during RF18. This detector did not function and was removed prior to the start-up therefore, the SRM detector was not subjected to a critical reactor. Actions continue to locate the missing SRM detector. There is no evidence of sabotage or tampering associated with this activity.
The licensee notified the NRC Resident Inspector. Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf This source is not amongst those sources or devices identified by the IAEA Code of Conduct for the Safety & Security of Radioactive Sources to be of concern from a radiological standpoint. Therefore is it being categorized as a less than Category 3 source |
| Where | |
|---|---|
Grand Gulf  Mississippi (NRC Region 4) | |
| Reporting | |
| 10 CFR 72.74 | |
| Time - Person (Reporting Time:+-3.03 h-0.126 days <br />-0.018 weeks <br />-0.00415 months <br />) | |
| Opened: | Frank Weaver 17:32 Jul 25, 2012 |
| NRC Officer: | Vince Klco |
| Last Updated: | Jul 25, 2012 |
| 48133 - NRC Website
Loading map... | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 481332012-07-25T20:34:00025 July 2012 20:34:00
[Table view]10 CFR 72.74, Reports of Accidental Criticality Or Loss of Special Nuclear Material Unaccounted for Source Range Monitor Detector 2012-07-25T20:34:00 | |