ENS 45223
ENS Event | |
|---|---|
22:33 Jul 22, 2009 | |
| Title | Loss of a Local Power Range Monitor Detector Containing Special Nuclear Material |
| Event Description | During the annual physical inventory of special nuclear material at Grand Gulf Nuclear Station (GGNS), a special nuclear material (SNM) inventory discrepancy was discovered. One unirradiated LPRM (local power range monitor) detector could not be located.
According to SNM inventory sheets, the LPRM detector should have been stored in a LPRM canister in the SNM storage area of the Auxiliary Building. During the inventory, the LPRM detector could not be located. Based on the inventory results and interviews with personnel knowledgeable of the disposal of the LPRM detector, it is believed the LPRM detector was discarded and was shipped to an authorized disposal facility for burial as radioactive waste. The LPRM detector contained a maximum total quantity of all licensed material in the device of approximately 5.84 microCuries of U-234 and U-235 combined (approximately 80wt% U-234 and 20wt% U-235). This quantity meets the criteria for reporting since quantities are greater than 10 times the quantity specified in Appendix C to 10CFR20. This material does not represent a hazard to the public health and safety since it is believed the material has been properly handled and disposed of as radioactive waste. There is no evidence of theft or diversion. This notification satisfies the 30-day notification requirement of 10 CFR 20.2201(a)(1)(ii). A subsequent written report will be made in accordance with 10 CFR 20.2201(b). The licensee has notified the NRC Resident Inspector. THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL 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. 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 20.2201(a)(1)(ii) | |
| Time - Person (Reporting Time:+-3.77 h-0.157 days <br />-0.0224 weeks <br />-0.00516 months <br />) | |
| Opened: | Michael Larson 18:47 Jul 22, 2009 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jul 22, 2009 |
| 45223 - NRC Website
Loading map... {"minzoom":false,"maxzoom":false,"mappingservice":"leaflet","width":"350px","height":"250px","centre":false,"title":"","label":"","icon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"zoom":6,"defzoom":14,"layers":["OpenStreetMap"],"image layers":[],"overlays":[],"resizable":false,"fullscreen":false,"scrollwheelzoom":true,"cluster":false,"clustermaxzoom":20,"clusterzoomonclick":true,"clustermaxradius":80,"clusterspiderfy":true,"geojson":"","clicktarget":"","imageLayers":[],"locations":[{"text":"\u003Cb\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003E\u003Ca class=\"mw-selflink selflink\"\u003EENS 45223\u003C/a\u003E - \u003Ca href=\"/Grand_Gulf\" title=\"Grand Gulf\"\u003EGrand Gulf\u003C/a\u003E\n\u003C/p\u003E\u003C/div\u003E\u003C/b\u003E\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003ELoss of a Local Power Range Monitor Detector Containing Special Nuclear Material\n\u003C/p\u003E\u003C/div\u003E","title":"ENS 45223 - Grand Gulf\n","link":"","lat":32.009233333333334,"lon":-91.04695833333334,"icon":"/w/images/7/79/Entergy_icon.png"}],"imageoverlays":null} | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 452232009-07-22T22:33:00022 July 2009 22:33:00
[Table view]10 CFR 20.2201(a)(1)(ii) Loss of a Local Power Range Monitor Detector Containing Special Nuclear Material 2009-07-22T22:33:00 | |