ENS 45633
ENS Event | |
|---|---|
21:00 Jan 18, 2010 | |
| Title | Missing Radioactive Sources Greater than 10 Times the Limit |
| Event Description | In 2009, a radioactive source inventory was conducted by a Prairie Island Radiation Protection Specialist. During the inventory, it was determined that two sources were missing that are greater than 10 times the quantity specified in 10CFR20 Appendix C. These two sources include a 0.07 [micro]Ci U-234 radiation monitor detector and a 0.2 [micro]Ci mixed gamma standard that contains 0.09 [micro]Ci of Am-241 (a 60 ml vial used for HPGe calibration.) The U-234 source is normally stored in the Hot I&C Shop and the mixed gamma standard with Am-241 is normally stored in the Hot Chemistry Lab. The inventory, that concluded on December 18, 2009, listed these sources as lost. Four other sources, that do not exceed 10 times any quantity specified in 10CFR20 Appendix C, were also unaccounted for during this inventory. Radiation Protection is still in the process of locating the missing sources that were identified during this inventory.
The licensee will provide information on the four other sources to the Operations Center on 1/19/2010. The licensee has informed the NRC Resident Inspector.
The four sources that do not exceed 10 times any quantity specified in 10CFR20 Appendix C: Isotope Ci Content C-14 TLD check source 0.5 [micro]Ci Cs-137 check source 8.8 [nano]Ci mixed gamma calibration source 1.9 [micro]Ci mixed gamma calibration source 2.0 [micro]Ci The 2.0 [micro]Ci mixed gamma source (previously reported as 0.2 [micro]Ci) that contains 0.09 [micro]Ci of Am-241(60 ml vial used for HPGe calibration) has been located in the Hot Chemistry Lab. Investigation into the five remaining sources continues. The licensee has informed the NRC Resident Inspector. Notified R3DO (Pelke), NRR EO (Cunningham), FSME EO (Camper), and Canada via fax.
Current status update on the sources that exceed 10 times any quantity specified in 10CFR20 Appendix C: The 2.0 [micro]Ci mixed gamma source - located and properly stored. The source was within the controlled area. (Previously reported) The 0.07 [micro]Ci U-234 radiation monitor detector - installed in Containment (located by maintenance documentation review). (Previously reported) While conducting a verification of all sources, a different 0.07 [micro] Ci U-234 radiation monitor detector was discovered to be missing. This detector is the same design as the originally reported U-234 detector but a different serial number. (New item) The station has completed a verification of all sources; the results are undergoing management review. Search for the missing sources continues. The Resident Inspector has been notified. Notified R3DO (Pelke), NRR EO (Cunningham), FSME (Camper), and Canada via fax. THIS MATERIAL EVENT CONTAINS A "NOT RECORDED" LEVEL OF RADIOACTIVE MATERIAL 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 | |
|---|---|
Prairie Island  Minnesota (NRC Region 3) | |
| Reporting | |
| 10 CFR 20.2201(a)(1)(ii) | |
| LER: | 05000282/LER-2009-009 |
| Time - Person (Reporting Time:+2.05 h0.0854 days <br />0.0122 weeks <br />0.00281 months <br />) | |
| Opened: | John Kempkes 23:03 Jan 18, 2010 |
| NRC Officer: | Dong Park |
| Last Updated: | Jan 20, 2010 |
| 45633 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Critical |
| Scram | No |
| Before | Power Operation (100 %) |
| After | Power Operation (100 %) |
WEEKMONTHYEARENS 456332010-01-18T21:00:00018 January 2010 21:00:00
[Table view]10 CFR 20.2201(a)(1)(ii) Missing Radioactive Sources Greater than 10 Times the Limit 2010-01-18T21:00:00 | |