|Entered date||Site||Region||Reactor type||Event description|
|ENS 55059||8 January 2021 14:15:00||Dow Chemical Company||NRC Region 3||The following is a synopsis of the phone call and email from Dow Chemical, Midland: While conducting a troubleshooting evaluation on the process gauge, personnel became aware that the shutter for the gauge was stuck in the open (normal operating) position. The unit is located approximately fifteen feet above the operating level. Personnel exposure is precluded by the location. The vendor has been contacted to determine a resolution plan and will be on-site next week. Gauge Info: Manufacturer: Vega Americas Source Holder Model: SH-F2B Isotope and quantity: Cesium-137, 750 mCi Source serial number 9006CP Source holder serial number 46168107|
|ENS 54719||19 May 2020 20:28:00||Dow Chemical Company||NRC Region 0|
At approximately 1930 EDT on May 19, 2020, the Dow Chemical Company TRIGA Reactor received notification of an upstream dam break in Sanford, Michigan and the potential to flood the facility. A Notification of Unusual Event was subsequently declared at 1930 EDT. The reactor was in a shutdown condition at the time of the event and has been due to COVID-19. The licensee is monitoring the flood situation in the area and licensee personnel have responded to the site. The NRC remains in the normal mode of operations. Notified DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
At 0850 EDT on May 21, 2020, the Dow Chemical Company TRIGA Reactor Terminated the Notification of Unusual Event. The event was terminated after flood water receded. The flood water receded faster than was expected. As stated, the reactor was in a shutdown condition at the time of the event. There was no effect on the reactor due to the flood water. Notified NPR PM (Wertz and Reed), NRR EO (Miller) IR MOC (Grant), DHS SWO, FEMA Operations Center, CISA IOCC, FEMA NWC (email), DHS Nuclear SSA (email), and FEMA NRCC SASC (email).
|ENS 53542||9 August 2018 16:38:00||Dow Chemical Company||NRC Region 4||The following information was received via E-mail: On August 9, 2018, the Agency (Texas Department of State Health Services) received a notice from the radiation safety officer that a line level gauge was stuck in the open normal operating position. The gauge was found to be stuck during a blow-down operation yesterday afternoon. The gauge is a Ronan SA1-F37 with a Cesium-137 100 milliCurie source (serial number M5513). The gauge is to be serviced by the manufacturer's technician next week. The RSO was contacting the licensing section to request an amendment to the permit to operate the gauge in the stuck open position. The gauge is fixed at least 20 feet above ground level on a vessel and should not cause any effects to personnel. No exposures were reported upon discovery and the gauge does not present an exposure risk to any individual. The RSO will report the repair or disposal once the gauge is serviced/inspected. The investigation into this event is on-going. Updates to be provided in accordance with SA300. Texas Incident #: I-9605|
|ENS 51945||19 May 2016 22:08:00||Dow Chemical Company||NRC Region 4||The following information was received via E-mail: Event Type: 30.50(b)(2), Events in which equipment is disabled or fails to function as designed. Event Narrative: On May 19, 2016 the Agency (Texas Department of State Health Services) was notified by the licensee's radiation safety officer (RSO) that while performing routine shutter checks, the shutter on an Ohmart model SHLM-BR4 could not be closed. The gauge contains a 5.0 curie cesium-137 source. Open is the normal operating position of the gauge. The source does not create any additional risk of exposure to the workers or members of the general public. The RSO stated they will call their service company to repair the gauge. The RSO stated the gauge is scheduled to be replaced during their next outage this fall. Additional information will be provided as it is received in accordance with SA-300. Texas Incident #: I-9405.|
|ENS 51933||16 May 2016 17:12:00||Dow Chemical Company||NRC Region 4||The following information was received via E-mail On May 16, 2016 the Agency (Texas Department of State Health Service) was notified by the licensee's radiation safety officer that the facility was unable to isolate a gauge for maintenance when the shutter failed to operate. The gauge is an Ohmart Vega model SHF2 containing a 200 millicurie cesium - 137 source, serial number 7548GK. The shutter was left in the normal operating, unshielded position. The source does not pose any additional risk of exposure to the workers or members of the general public. The RSO stated they have called TechStar to repair the gauge. Additional information will be provided as it is received in accordance with SA-300. Texas Incident #: I 9404|
|ENS 45795||26 March 2010 14:37:00||Dow Chemical Company||NRC Region 3||A 5.862 mCi sample of C-14 in a dipropylene glycol propyl ether mix was identified as missing on 2/26/10 during the annual physical inventory of radioactive materials. The sample had been present in its approved storage location during the 2009 physical inventory. The material was lost sometime between March 2009 and February 2010. The licensee has taken the following actions to locate the material: - Spoke with all authorized users to identify location or usage within the last year; - Detailed search of all storage areas and radioisotope-approved labs; and - Checked waste disposal records. 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 45091||22 May 2009 13:30:00||Dow Chemical Company||NRC Region 4||On March 21, 2009, at 1050 AM, the Agency (Texas Department of Health) received a report from the licensee that while performing the biannual test on a Ronan Engineering nuclear gauge, model # SA-1, containing an original activity of 100 millicuries (calculated current activity of 75 millicuries) of Cesium (Cs) - 137, the shutter failed to close. The gauge is installed on the side of a vessel approximately 50 feet above ground and is used for level detection. A dose rate measurement taken at the gauge indicated 0.03 millirem per hour, and poses no risk of radiation exposure to their workers. The manufacturer has been contacted to provide corrective maintenance on the shutter. Texas Incident # I-8635I|
|ENS 45040||4 May 2009 13:40:00||Dow Chemical Company||NRC Region 4||The following report was received from the Texas Department of State Health Services via e-mail: The licensee reported that during the performance of a routine six month inspection, the shutter on an Ohmart/VEGA level gauge model SH-F2, containing a 200 mCi Cesium (Cs) - 137 source, serial # 7548GK, would not properly close. The gauge is used as a level monitor on a vent stack. The source was left in its normal operating position and does not pose an exposure risk to individuals. Radiation levels in the area were measured and found to be normal. As a corrective action, the licensee lubricated the operating mechanism on the gauge. They again tried to operate the mechanism, but could not. They continued to lubricate the mechanism periodically in an effort to free the mechanism. The licensee contacted a service provider and arrangements were made for assistance in closing the shutter if needed. On 4/29/09, the licensee was able to close the mechanism and operate the shutter normally. There was no apparent damage to the shutter operating mechanism. Texas Report Number I-8633|