Event Notification Report for July 10, 2025

EN Revision Imported Date: 7/10/2025

EN Revision Text: LOSS OF THE PUBLIC PRIMARY ALERT NOTIFICATION SYSTEM

The following information was provided by the licensee via phone and fax:

"On 6/29/2025, at 1641 CDT, the National Weather Service reported to Cooper Nuclear Station that the National Warning System (NAWAS) radio tower near Shubert, Nebraska was non-functional. The Shubert Tower transmitter activates the Emergency Alert System (EAS)/tone alert radios used for public prompt notification which is part of Cooper's primary alert and notification system (ANS). On 6/30/2025, at 1641 CDT, the Shubert Tower transmitter remained non-functional for 24 hours.

"This primary ANS equipment was not restored to service within 24 hours, and therefore this condition is reportable under 10 CFR 50.72(b)(3)(xiii), since the backup alerting methods do not meet the primary system design objective. The backup notification system is available to use for notifications if needed.

"The NRC Resident Inspector has been notified."

* * * UPDATE ON 07/09/2025 AT 1453 EDT FROM BAILEY GILES TO ERIC SIMPSON * * *

"At 1045 CDT, on 7/09/2025, Cooper Nuclear Station was informed that the NAWAS radio tower near Shubert, Nebraska has been restored to service.

"The NRC Resident Inspector was notified."

Notified R4DO (Dodson).

AGREEMENT STATE REPORT - LOST EXIT SIGN

The following is a summary of information received from the Colorado Department of Public Health and Environment via email:

One exit sign, containing 10 curies of tritium, was determined to be lost by the licensee.

Manufacturer: SRB Technologies
Model Number: BX-10-BK

Colorado Event Number: CO250019

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

AGREEMENT STATE REPORT - RUPTURED SEALED SOURCE

The following information was provided by the Georgia Radioactive Materials Program Environmental Protection Division (the State) via email:

"On June 27, 2025, a krypton-85 sealed source capsule ruptured while unloading a Honeywell model 2201 series thickness gauge. The manufacturing engineer immediately turned on the fume hood and left the room when it was noticed the radiation monitors in the area rapidly increased in dose. It was determined the capsule had ruptured. The highest dose rate in the area of the source was 7 mR/h. The source was placed in the fume hood to allow gas to escape. The dose rate returned to normal approximately an hour after the source was placed in the fume hood. The dose rate at the source was then indistinguishable from background. The empty capsule was placed in a paint can containing cat litter and placed in their radiation source storage area.

"As a corrective action, all persons performing this activity have been retrained on loading and unloading the model 2201 source capsule, and regarding the importance of safety when unloading sealed source capsules containing [radioactive material].

"The thermoluminescent dosimeter badge of the manufacturing engineer will be sent to Landauer [the manufacturer] and the licensee will notify the State when they receive those results. Respirators are not utilized in their daily operations. The State will continue to investigate the incident and will follow up with new information."

Additional information on the sealed source:
Model: KAC.D5
Serial number: TW911
Activity: 14.8 GBq of krypton-85 as of December 2, 2011

Georgia incident number: 101

AGREEMENT STATE REPORT - LOSS OF LICENSED MATERIAL

The following information was received from the Wisconsin Department of Health Services (the Department) via email:

"On June 11, 2025, the Department received a telephone notification that the licensee was unable to locate two vials of carbon-14, with an aggregate activity of 1.92 mCi. The vials were identified by the licensee as missing on June 10, 2025. The licensee completed an investigation by June 26, 2025, and submitted a written report to the Department. The licensee determined the package in the original transport box was mistakenly picked up by a third-party cleaning service and disposed of as normal trash. The landfill was contacted. There are no suspected health or safety risks to any worker or member of the public. The Department will perform an investigation into this incident."

WI Event Report ID No: WI250006

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

AGREEMENT STATE REPORT - STOLEN GAUGE

The following report was received via email by the Virginia Radioactive Materials Program (VRMP):

"At approximately 1515 EDT on 7/2/2025, VRMP was notified of an incident involving a stolen portable nuclear gauge. Sometime between the hours of 1500 on 7/1/2025 and 0700 on 7/2/2025, a Troxler model 3411 portable nuclear density/moisture gauge containing 9 mCi Cs-137 and 44 mCi Am-241 was discovered missing from a construction site. The authorized user notified the radiation safety officer (RSO) who went to the site to search and then notified the VRMP.

"Per the RSO, at approximately 1500 on 7/1/2025, the authorized user left the gauge on the site to carry other items to his vehicle outside the fenced construction site a short distance away when it started to rain and then found the gate to the site locked when he returned to retrieve the gauge. He did not notify the RSO at that time. He returned at approximately 2030 on 7/1/2025 to find the gauge missing. He returned to the licensee's office and notified the RSO around noon on 7/2/2025. The RSO went to the site to search for the gauge. When he could not find it, he contacted the VRMP. He is also contacting the Alexandria Police Department to report the theft. The gauge was not in the transportation box when it was left on the site.

"VRMP will follow up with an investigation."

Virginia Event Report Number: VA250002

* * * UPDATE ON 07/08/2025 AT 1740 EDT FROM SHEILA NELSON TO ROBERT THOMPSON * * *

The following information was provided by the Virginia Radioactive Materials Program (VRMP) via email:

"The VRMP was notified at 1230 EDT that the missing gauge has been recovered. The gauge appears to be undamaged with no signs of tampering. The licensee will obtain a leak test and evaluate the gauge for serviceability. The agency will schedule an in-person investigation."

Notified R1DO (Bickett), NMSS Events Notification (email), ILTAB (email).

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

AGREEMENT STATE REPORT - UNABLE TO RETRACT SOURCE

The following information was received from the Minnesota Department of Health (MDH), Radioactive Materials Unit via email:

"On July 2, 2025, MDH received an email stating that on July 2, 2025, at 1130 [CDT] the licensee had a source retrieval [issue] of a 35.64 Ci Ir-192 source in a SPEC 150 camera. The licensee's radiation safety officer (RSO) was notified that a radiographer was unable to retract the source to its fully shielded position during radiographic operations. The radiographer's assistant cranked the source out and realized that he had gone too far and notified the radiographer. The radiographer investigated the situation and observed the source was spooled on the ground. The radiographer alerted the RSO. The RSO informed all radiation workers to establish a 2 mR/hr boundary. The RSO and a staff member, who is trained in source retrieval, were able to crank the source back into its fully shielded position at 1203 [CDT]. The radiographer received 144.9 mrem whole body. The RSO calculated the radiographer received 526.27 mrem to the feet. The RSO received 4.5 mrem and the source retrieval staff received 0.3 mrem. MDH plans on conducting an investigation next week."

Minnesota Event Report ID: MN250003