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 Entered dateSiteRegionReactor typeEvent description
ENS 5301213 October 2017 15:46:00Idaho State UniversityNRC Region 4A series 50 nuclear accident dosimeter S/N AP237 with a 1 gram 62 mCi Pu-239 source was determined missing on 10/13/17. The dosimeter was one of 14 received by Idaho State University from the Department of Energy (DOE) in 1991. In 2003, this particular dosimeter was found to have detectable surface contamination and determined to have a compromised source. The device was removed from local inventory in 2003 pending transfer. Attempts were made to transfer the device to Idaho National Lab (INEL), but were declined. The device is believed to have been placed in the Idaho State University nuclear waste stream, and may have been transferred in 2006 or 2011 with other waste via Thomas Gray to US Ecology, but there are no supporting records. Investigation is ongoing. 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
ENS 462252 September 2010 15:45:00Idaho State UniversityNRC Region 4

On 9/2/2010, the licensee concluded that they were unable to account for two (2) Pu-239 solid sources that are about the size of a quarter each. Each source is estimated to weight about 1 gm with a source strength of 60 milliCuries and is in a non-dispersible form. The licensee noted that these sources were missing as a result of a normal inventory and leak test procedure on 8/19/10. Since that time the licensee has conducted an intensive search for the material both visually and using detection instrumentation but was unable to locate the material. The licensee discovered that the lost sources were last checked out of their storage location as part of a group of 10 such sources in April 2010. In July 2010 records indicate that only 8 of 10 sources were checked out since only 8 were available at the time. The licensee has restricted access to the sources and implemented additional controls for being able to check out the sources that include using a two man rule.

  • * * UPDATE AT 1727 EST ON 2/11/11 FROM BREY TO HUFFMAN * * *

As of 2/11/11 at approximately 1710 EST, the licensee has formally declared the two plutonium button sources lost. The licensee stated that following extensive searching the sources are considered lost. The licensee notes that it has been in contact with responsible staff at NRC Region 4 and that the NRC had sent inspectors to the facility on October 4 and October 18, 2010. The licensee will continue to stress an awareness of the missing sources to personnel and emphasize continued vigilance for finding the sources. The licensee has not reached any conclusion as to what happened to the lost sources. R4DO (Clark), FSME (McConnell), and ILTAB (Hahn) notified.

  • * * UPDATE FROM RICHARD BREY TO JOE O'HARA AT 1705 EDT ON 4/6/11 * * *

The two missing plutonium sources have been found inside a source vault mixed in with other radioactive materials in storage for decay purposes. Notified R4DO(O'Keefe), FSME(Michalak), and ILTAB(Johnson). 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 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

ENS 4077626 May 2004 09:38:00Idaho State UniversityNRC Region 4During routine annual maintenance, a fueled control rod was determined to have a cladding failure. The control rod end cap weld was broken and the fuel in the fueled control rod had been exposed. A preliminary radiological assessment was performed and showed negligible release. There was minimum surface contamination isolated to the area of the breach. Radiation readings on contact were less than 20 millirem/hour. All air sample concentrations were well below 10CFR20 Derived Air Concentration (DAC) limits. Licensee notified the NRC Program Manager for Non Power Reactors and the Region 4 RA.