NRC Event Notification Reports

LOST SOURCES
Las Vegas, NV, 03/31/2026
"On April 1, 2026, RCP was notified by the licensee that members of a cleaning crew disposed of radioactive sources through the common trash. The licensee was in the process of moving to a new location and they left their sources in a marked box for a local radiopharmacy to move the sources to the new location and to dispose of two sources that were past their useful activity. The landlord's cleaning crew entered the building and d…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260513en.html#en58268

POTENTIAL MEDICAL EVENT
Grand Rapids, MI, 04/01/2026
On April 1, 2026, the radiation safety officer (RSO) at BAMF Health Clinic received notification from their clinical trial sponsor, Heart Bio, that they identified unexpected trace amounts of thorium-228 in their ARTISAN AB001-101 trial medication that is currently being tested and administered via intravenous injection. The sponsor's preliminary dose analysis estimated that four different organs and tissues will rece…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260409en.html#en58230

AUTOMATIC REACTOR SCRAM
Hatch (GA), 04/23/2026
"On April 23, 2026, at 1408 EDT, with Unit 1 in mode 1 at 100 percent power, the reactor automatically tripped on high reactor pressure. The cause of the high reactor pressure is currently under investigation. The trip was not complex, with all systems responding normally post-trip.

"Operations responded and stabilized the plant. Reactor water level is being maintained by the feedwater system. Decay heat is being removed…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260424en.html#en58257

MANUAL REACTOR SCRAM
Fermi (MI), 05/18/2026
"At approximately 1803 EDT on May 18, 2026, the operating crew responded to a fire below the main generator. The fire was identified on the Y-phase of the isophase ducts. At 1807, the reactor was manually scrammed, and a level 3 isolation signal was received due to the scram. The scram was non-complicated. The fire was confirmed extinguished at 1810.

"Operations responded and stabilized the plant. Reactor water level is being…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260519en.html#en58286

LOST SOURCES
Mobile, AL, 04/30/2026
On April 30, 2026, the Agency attempted to conduct a site visit for Pope Testing Services, LLC at its licensed storage address in Mobile, Alabama. The current building owner reported that the licensee vacated the storage space for roughly a year and removed all equipment at that time. No licensed material or company property remains at the location. All recent attempts to contact the licensee have been unsuccessful. The last confirmed…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260512en.html#en58264

LEAKING SOURCE
Boston, MA, 09/30/2025
"On May 14, 2026, Boston Medical Center notified the Agency that on September 30, 2025, a Cs-137 sealed source was found to be leaking.

"The source is a Cs-137 sealed source, manufactured by Eckert & Ziegler, serial number 1356-1-5. The source has an activity of 165 microcuries. The analysis indicated a contamination level of 0.00617 microcuries, which exceeds the regulatory limit. Upon discovery, the source was immediately isolate…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260522en.html#en58279

TECHNICAL SPECIFICATION ABNORMAL OCCURRENCE
Columbia, MO, 05/17/2026
"On May 17, 2026, at 0457 CDT, the control room received a firemain low pressure alarm with indication reading 0 psi. The firemain provides the source of water to the emergency pool fill system as required by Technical Specification 3.9.b. At 0501 it was confirmed this was an actual firemain rupture and not just an indication. At 0502 the reactor was manually scrammed. At 0514 the ruptured firemain was…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260519en.html#en58282

STOLEN MOISTURE DENSITY GAUGE
Irving, TX, 05/11/2026
"On May 11, 2026, at 1630 CDT, the Department was notified by the licensee that an InstroTek model 3500 moisture density gauge was stolen from their pickup truck. The gauge contained a 10 mCi Cs-137 source and a 40 mCi Am-241/Be source. The theft was reported to the Dallas Police Department. The source handle was secured with a lock. There is no immediate threat to the public.

"Additional information will be reported…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260518en.html#en58275

LOST EXIT SIGNS
Indianapolis, IN, 04/22/2026
The licensee reported three exit signs, manufactured by SRB Technologies and each nominally containing 50 Ci of tritium, were lost in Indianapolis, IN. The loss was discovered during an inventory of exit signs performed on April 22, 2026.

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 perm…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260518en.html#en58274

LOST EXIT SIGNS
Denver, CO, 12/01/2025
The licensee reported eight exit signs, containing 7.62 Ci of tritium each (60.96 Ci total), were lost in Denver, Colorado.

Manufacturer: Isolite Corporation
Model number: 2000

Colorado event number: CO260005

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 co…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260512en.html#en58265

LOSS OF THE PUBLIC PROMPT NOTIFICATION SYSTEM
Cooper (NE), 05/09/2026
"On May 9, 2026, at 1529 CDT, the National Weather Service reported to Cooper Nuclear Station that the National Warning System radio tower near Shubert, Nebraska was not functioning. The Shubert tower transmitter activates the emergency alert system and tone alert radios used for public notification. Additional information from the National Weather Service received at 1244 CDT on May 10, 2026, determi…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260511en.html#en58272

TECHNICAL SPECIFICATION VIOLATION
Rolla, MO, 04/09/2026
"On April 9, 2026, at approximately 1230 CDT, upon reviewing operator requalification data, Missouri University of Science and Technology Reactor (MSTR) staff determined that a licensed reactor operator did not have a current medical evaluation as required by 10 CFR 55.21. A follow-up examination was due no later than March 21, 2026. The operator was suspended from further operations until compliance with 10 CFR 55…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260413en.html#en58240

STUCK SHUTTER
Morris, IL, 04/02/2026
"On April 3, 2026, the Agency was notified by the radiation safety officer (RSO) at Nouryon Surface Chemistry, LLC (IL-01445-01), to advise of a fixed gauge with a stuck shutter in the open position. The issue was discovered on April 2, 2026, during a routine 6-month maintenance check/inventory on the following Ronan nuclear gauge: 3M Model 4F6S (S/N M2377) Cs-137 (300 mCi as of June 1988). The RSO reported that the source normally o…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260413en.html#en58233

LOST SOURCE
Morgantown, WV, 04/02/2026
In 2023, an Agilent gas chromatograph had its source (15 mCi Ni-63) removed and was sent for recycling. The source was placed in storage on-site. In March 2026, the licensee began returning all stored material to the manufacturer for disposal. It was determined that the stored source contained no radioactive material and the Ni-63 could not be located. After performing multiple searches, the source was deemed lost at 1445 EDT on Ap…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260413en.html#en58232

MEDICAL EVENT
Charleston, SC, 04/02/2026
"The South Carolina Department of Environmental Services was notified via telephone at approximately 0730 EDT on April 3, 2026, that a medical event had been discovered by the licensee on April 2, 2026, at approximately 1400 EDT. The Medical University of South Carolina (MUSC) reported an underdose to a patient's liver during a Y-90 microsphere procedure by 76 percent of the prescribed 550 Gy dose. The licensee estimates that the…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260413en.html#en58231

LOST RADIOACTIVE MATERIAL IN TRANSIT
River Bend (LA), 03/05/2026
On March 5, 2026, at 1224 CST, River Bend declared a radioactive materials shipment lost after it was supposed to be delivered by February 2, 2026. The last time the shipment was scanned in the tracking system was on February 11, 2026, at the [common carrier] distribution warehouse in Pearl, MS. The device is a digital acquisition unit inside a Pelican case which contains 122 microcuries of Co-60. River Be…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260407en.html#en58225

UNPLANNED CONTAMINATION
Fort Carson, CO, 03/30/2026
On March 30, 2026, at 0730 MDT, a nuclear technician dropped a vial containing 200 millicuries of technetium-99m in the hot lab. The technician's shoes, lab floor, and surrounding areas were contaminated. The technician's shoes and the lab floor were decontaminated. Areas that still had detectable levels of contamination were covered with a lead apron. The spread of contamination was limited to the hot lab. Access to…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260407en.html#en58223

LOST I-125 SEED
Phoenix, AZ, 03/27/2026
"The Department received notification from the licensee of a lost I-125 seed used for localization. A patient was implanted with a 0.133 millicurie I-125 seed on March 18, 2026, with the placement of the seed verified by x-ray. The patient returned on March 27, 2026, to have the tissue and seed removed. The tissue with seed was verified by x-ray and then sent to pathology, where no seed was [found]. The operating room was survey…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260407en.html#en58222

MEDICAL EVENT
Clifton, NJ, 03/27/2026
Summit Health Cancer Center reported that a patient scheduled to receive a 200 mCi Lu-177 Pluvicto treatment only received 150 mCi. The underdose was due to either faulty or improperly connected tubing. The licensee is investigating and will forward a full report.

A Medical Event may indicate potential problems in a medical facility's use of radioactive materials. It does not necessarily result in harm to the patient.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260403en.html#en58220

MEDICAL EVENT
New Haven, CT, 03/25/2026
"On March 25, 2026, at 1511 EDT, a patient was planned for coronary brachytherapy for treatment to the proximal left circumflex coronary artery for an injury 30 millimeter (mm) in length and a target vessel mean luminal diameter of 3 mm. A proximal margin into the left main coronary artery and a distal margin further into the left circumflex vessel were also included. The planned treatment was to deliver 18.4 Gy at 2 mm depth usin…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260403en.html#en58219

UNANALYZED CONDITION
Peach Bottom (PA), 04/01/2026
"At 0924 EDT on April 1, 2026, it was determined that Unit 3 was in an unanalyzed condition because two emergency diesel generators (EDGs) were inoperable. One EDG was inoperable due to scheduled maintenance, and the second EDG was inoperable due to blocking for an emergent plant issue. This condition is not bounded by existing design and licensing documents; however, it poses no impact to the health and safety of the p…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260402en.html#en58228

UNATTENDED RADIOGRAPHY CAMERA
Baton Rouge, LA, 03/03/2026
"On March 3, 2026, the site work coordinator at the ExxonMobil refinery in Baton Rouge reported that a radiography camera had been found unattended. The camera was discovered by an employee of IRIS Inspection Company.

"The licensee crew consisted of two state-carded radiographers and one instructor radiographer. The crew entered the unit, set up the barricade, and completed one exposure. After completing the ex…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260310en.html#en58183

MEDICAL EVENT
Pittsburgh, PA, 03/31/2026
"On March 31, 2026, the licensee informed the Department of a medical event involving an administration of a dose to the wrong individual. It is reportable as per 10 CFR 35.3045(a)(1)(ii)(c).

"On March 31, 2026, a patient was scheduled to receive Tc-99m sestamibi. The nuclear medicine technologist accidentally administered 1 mCi of I-131 that was intended for another patient. Details are still incoming at this time. The patient…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260408en.html#en58226

FITNESS FOR DUTY
Cook (MI), 05/11/2026
"On May 11, 2026, at 0600 EDT, a fitness for duty (FFD) employee had a confirmed positive test result for a controlled substance during a random fitness for duty test. The employee's access to the plant has been denied. This notification is being made under 10 CFR 26.719 (b)(2)(ii), significant FFD policy violations or programmatic failures, as a twenty-four (24) hour report.

"The licensee has notified the NRC Resident Inspector."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260512en.html#en58273

MISSING GAUGE
Merriville, IN, 05/07/2026
During a routine audit, it was discovered that a CPN moisture density gauge was missing. The licensee contacted their alternate storage sites and work sites and performed searches for the missing gauge. The gauge was then declared missing. Searches have been suspended pending further direction from the Radiation Safety Officer.

Gauge information:
Model: MC1-DPR
Serial number: 10400193
Sources: 10 mCi Cs-137, 50 mCi Am-241/Be

T…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260515en.html#en58270

STUCK SHUTTER
Morris, IL, 03/20/2026
On March 20, 2026, the Agency was notified after hours via email regarding a stuck shutter on a Vega model SH-F2 (serial number 2767CO) containing 300 mCi of Cs-137. The normally open, vessel mounted gauge was found stuck open during routine maintenance. No vessel entry or potential elevated exposures are expected.

On March 21, 2026, maintenance personnel lubricated the shutter and were able to successfully close the shutter. The sh…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260330en.html#en58214

POSSIBLE OVEREXPOSURE
Gray, TN, 04/03/2026
The Department was notified on April 3, 2026, at 1504 EDT, of a minor skin contamination event that took place at one of Precision Nuclear's radiopharmacy facilities, resulting in a possible overexposure. The employee's clothing, personal badge (dosimeter), and skin were contaminated with less than 1 mCi of flourine-18. Decontamination efforts began immediately after the event and were completed on the same day. Since the emplo…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260413en.html#en58234

LOSS OF SEISMIC MONITORING
Vogtle 1/2 (GA), 03/31/2026
"At 0750 EDT on March 31, 2026, the Vogtle 1 and 2 seismic monitoring panel was discovered [to be] nonfunctional while performing operator rounds in the control room. Compensatory measures for seismic event classification have been implemented in accordance with Vogtle procedures.

"This is an eight-hour, non-emergency notification for a loss of emergency assessment capability. This event is reportable in accordance…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260401en.html#en58224

LOST MOISTURE DENSITY GAUGE
Escanaba, MI, 01/01/2021
An NRC inspection of the licensee found that one of three Troxler model 3440 moisture density gauges, containing 10 mCi of Cs-137 and 40 mCi of Am-241/Be, was no longer in the licensee's possession. The licensee reported that the gauge had been sold to a company in Wisconsin approximately five years ago. No records of the sale were available. The licensee is attempting to locate additional information about the missin…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260519en.html#en58276

FITNESS FOR DUTY
LaSalle (IL), 05/15/2026
"At 0906 CDT on 05/15/2026, it was determined that a non-licensed supervisor tested positive in accordance with the fitness for duty testing program. The individual's authorization for site access has been terminated. The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260518en.html#en58280

FITNESS FOR DUTY
Vogtle 3/4 (GA), 05/21/2026
"At 0800 EDT on May 21, 2026, it was determined that a contract supervisor failed a test specified by the fitness for duty testing program. The individual's authorization for site access has been terminated.

"The NRC Resident Inspector has been notified."
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260522en.html#en58288

LOST AND RECOVERED GAUGE
Raleigh, NC, 05/05/2026
The following is a summary of information that was provided by the North Carolina Department of Health and Human Services Radioactive Materials Branch (RMB) email:

On May 5, 2026, RMB reported that the licensee lost control of a nuclear density gauge after it was improperly secured and fell from a moving vehicle. The North Carolina Department of Transportation observed and responded to the incident and then took readings…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260512en.html#en58267

LOST LOCALIZATION SEED
New York City, NY, 03/12/2026
The licensee reported that three I-125 seeds were implanted in a patient on March 11, 2026, and explanted on March 12, 2026. On March 17, 2026, during an inventory check, one of the seeds could not be located. They believe the seed was inadvertently discarded with the specimen in the bio waste. The seed activity was estimated as 98 microcuries on the date of use and 89 microcuries on the date it was discovered missing…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260521en.html#en58278

STUCK SHUTTER
Jesup, GA, 03/30/2026
The licensee reported that a normally open Berthold model P2623-100 fixed gauge (S/N 2571-8-90) with a 250 mCi Cs-137 source was found stuck in the open position during an annual maintenance shutdown. After the shutdown the licensee plans to move the source to their radiation storage trailer. The source will ultimately be sent for proper disposal.

Georgia incident number: 118
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260407en.html#en58221

EQUIPMENT FAILURE
Libertyville, IL, 05/15/2026
"The Agency was contacted on May 15, 2026, by the corporate radiation safety officer at Isomedix Operations, Inc. (IL-01123-02) in Libertyville, IL, to advise of a reportable equipment failure. According to the report, the L375 radiation monitor used to perform required radioactivity measurements of the pool water (e.g., leak testing of the pool irradiator sources) on a pool irradiator failed at some point during the last m…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260522en.html#en58281

INVALID SPECIFIED SYSTEM ACTUATION
Browns Ferry (AL), 02/03/2026
"This 60-day telephone notification is being made per the reporting requirements specified by 10 CFR 50.73(a)(2)(iv)(A) and 10 CFR 50.73(a)(1) to describe an invalid actuation of a general containment isolation signal affecting more than one system.

"On February 3, 2026, Unit 3 experienced a loss of 'A' reactor protection system (RPS). The 3A RPS motor generator (MG) set was found tripped and coasting…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260407en.html#en58235

LOST SOURCE
Sergeant Bluff, IA, 03/25/2026
"On March 25, 2026, the licensee informed the Department of a possible reportable event. It is reportable as per 10 CFR 20.2201(a)(1)(i) (greater than 1,000 times the quantity specified in Part 20 Appendix C; Co-60 = 1 microcurie).

"The service provider (Berthold) came on site to retrieve the third Co-60 source from inside the dip tube that had come detached from the rod and cable. Upon surveying the tube, no source was detect…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260401en.html#en58216

STUCK RADIOGRAPHY SOURCE
Chanute, KS, 03/31/2026
On April 1, 2026, KDHE was notified of a source retrieval incident which occurred on March 31, 2026, involving Innovative Plant Consulting at the Babcock and Wilcox Chanute facility. A 55.4 Ci Ir-192 source from a QSA Global 880D radiography camera became non-retrievable after a wind-driven welding screen struck and displaced the magnetic stand supporting the guide tube assembly. The radiography crew and radiation safety…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260521en.html#en58277

FAILED ACCESS CONTROL SYSTEM
College Park, MD, 04/06/2026
On May 4, 2026, at 1613 EDT, MDE received an email from the licensee's radiation safety officer (RSO) detailing a reportable event. The report came from the irradiator facility director, and the details are as follows.

On April 6, 2026, at approximately 0930 EDT, the irradiator vault door became inoperable when its drive chain snapped during routine monthly surveillance activities. This failure rendered the acc…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260512en.html#en58266

LOST SOURCE
Houston, TX, 04/01/2026
"On February 6, 2026, the Department received a complaint from an individual listing several concerns regarding a licensee. One of the concerns was that the licensee was unable to locate two moisture density gauges. On March 5, 2026, the Department performed an on-site investigation. The investigators found that a new radiation safety officer (RSO) had been hired two weeks prior to the investigators arriving. During the investigatio…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260408en.html#en58227

LOST MEDICAL SOURCE
Tampa, FL, 03/31/2026
"On April 1, 2026, at approximately 1315 EDT, a radioactive medical source was identified as missing from Moffitt Cancer Center in Tampa, Florida. It was discovered that the drug Lutathera, which is a lutetium-177 (Lu-177) medical unsealed source used for intravenous therapy, had been accidentally discarded on March 31, 2026, at approximately 1600 EDT by a nuclear medicine technician. At the time of disposal, the activity was ap…
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2026/20260408en.html#en58229