ENS 56815
ENS Event | |
|---|---|
04:00 Jul 6, 2022 | |
| Title | Lost Sealed Sources |
| Event Description | The following information was provided by the licensee via phone and email:
This is a non-emergency 30-day notification for missing licensed material. This event is reportable in accordance with 10 CFR 20.2201(a)(1)(ii). On September 25, 2023, while performing the required semi-annual source leak check and inventory, radiation protection personnel could not locate seven sealed radioactive sources. Five of the sources exceed the reporting threshold of ten times the activity listed in 10 CFR 20 Appendix C. Of the five sources, four were Ni-63 sources previously utilized in security bomb detection equipment with a current source radioactivity of between 7.1 and 8.7 mCi. The fifth sealed source exceeding the reporting threshold is an Am-241 former lab calibration standard with a source radioactivity of 0.97 microcuries. These sources were last accounted for on July 6, 2022. Pilgrim's accountability process does not require leak checks or physical inventory of sources that are out of service. A search was conducted for the missing sources; however, they could not be located. These sealed sources are classified as Category 5 radioactive sources in accordance with the International Atomic Energy Agency (IAEA) Safety Guide No. RS-G-1.9. Sources that are less than Category 3 (Cat 4 and 5 sources) are very unlikely to cause permanent injury to individuals. Based on the activity of Ni-63 and Am-241 present in the sources, this 30-day phone notification to NRC is provided pursuant to 10CFR20.2201(a)(1)(ii). The required written report pursuant to 10CFR20.2201(b)(1) will be provided to NRC within 30 days. The Resident Inspector has been notified. The licensee will notify State and local authorities. 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. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf |
| Where | |
|---|---|
| Pilgrim Massachusetts (NRC Region 1) | |
| Reporting | |
| 10 CFR 20.2201(a)(1)(ii) | |
| Time - Person (Reporting Time:+11435.15 h476.465 days <br />68.066 weeks <br />15.664 months <br />) | |
| Opened: | David Noyes 15:09 Oct 25, 2023 |
| NRC Officer: | Ernest West |
| Last Updated: | Oct 25, 2023 |
| 56815 - NRC Website
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Pilgrim with 10 CFR 20.2201(a)(1)(ii) | |
WEEKMONTHYEARENS 568152022-07-06T04:00:0006 July 2022 04:00:00
[Table view]10 CFR 20.2201(a)(1)(ii) Lost Sealed Sources ENS 426612006-05-26T19:25:00026 May 2006 19:25:00 10 CFR 20.2201(a)(1)(ii) Potential Loss of Licensed Nuclear Material 2022-07-06T04:00:00 | |