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Chanhassen, MN, 11/25/2025
Rosemount Nuclear Instruments, Inc. reported that certain Rosemount model 3154 pressure transmitters have exhibited a higher field return rate as a result of electronics assembly failure caused by an open circuit condition in […]
Chanhassen, MN, 11/25/2025
Rosemount Nuclear Instruments, Inc. reported that certain Rosemount model 3154 pressure transmitters have exhibited a higher field return rate as a result of electronics assembly failure caused by an open circuit condition in […]
Perdue Hill, AL, 11/17/2025
During routine bi-annual shutter checks, the licensee noted that their device had a malfunctioning shutter. The device's shutter failed in its normal open position. The licensee attempted to address the malfunction by spraying the shutter with […]
Perdue Hill, AL, 11/17/2025
During routine bi-annual shutter checks, the licensee noted that their device had a malfunctioning shutter. The device's shutter failed in its normal open position. The licensee attempted to address the malfunction by spraying the shutter with […]
Seattle, WA, 11/19/2025
At 1651 PST, the Department was notified of the misadministration of a 200 mCi Lu-177 prostate membrane specific antigen dose for a patient on a research protocol. The dose was administered using an infusion pump. The principal investigator (PI) of the study […]
Seattle, WA, 11/19/2025
At 1651 PST, the Department was notified of the misadministration of a 200 mCi Lu-177 prostate membrane specific antigen dose for a patient on a research protocol. The dose was administered using an infusion pump. The principal investigator (PI) of the study […]
Allenspark, CO, 11/18/2025
The licensee reported two exit signs, each containing 11.5 Ci of tritium, were lost in Allenspark, Colorado.
Manufacturer: Safety Light Corporation
Model number: 2040
Colorado event number: CO250044
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' […]
Allenspark, CO, 11/18/2025
The licensee reported two exit signs, each containing 11.5 Ci of tritium, were lost in Allenspark, Colorado.
Manufacturer: Safety Light Corporation
Model number: 2040
Colorado event number: CO250044
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' […]
Longmont, CO, 11/14/2025
The licensee reported three exit signs, each containing 17.51 Ci of tritium, were lost in Longmont, Colorado.
Manufacturer: SRB Technologies
Model number: BXU20GS
Colorado event number: CO250043
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF […]
Longmont, CO, 11/14/2025
The licensee reported three exit signs, each containing 17.51 Ci of tritium, were lost in Longmont, Colorado.
Manufacturer: SRB Technologies
Model number: BXU20GS
Colorado event number: CO250043
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' LEVEL OF […]
Lincolnwood, IL, 11/18/2025
The licensee reported to the Agency that a generally licensed gas chromatograph could not be located. The device was listed as in use at the licensee's site in Lincolnwood, IL. No record could be found of the device's disposal, and search efforts […]
Lincolnwood, IL, 11/18/2025
The licensee reported to the Agency that a generally licensed gas chromatograph could not be located. The device was listed as in use at the licensee's site in Lincolnwood, IL. No record could be found of the device's disposal, and search efforts […]
Carol Stream, IL, 11/18/2025
"The Agency was contacted on November 17, 2025, to advise of four missing I-125 brachytherapy seeds with an activity of approximately 0.23 millicuries each. Three seeds remain missing with the most likely disposition being lost in transit from the […]
Carol Stream, IL, 11/18/2025
"The Agency was contacted on November 17, 2025, to advise of four missing I-125 brachytherapy seeds with an activity of approximately 0.23 millicuries each. Three seeds remain missing with the most likely disposition being lost in transit from the […]
South Texas (TX), 11/21/2025
"At 1208 CST on 11/21/2025, with Unit 2 in Mode 1 at 100 percent power, [the] Unit 2 reactor automatically tripped due to a main transformer lockout. The trip was not complex, with all systems responding normally post-trip. One of three […]
South Texas (TX), 11/21/2025
"At 1208 CST on 11/21/2025, with Unit 2 in Mode 1 at 100 percent power, [the] Unit 2 reactor automatically tripped due to a main transformer lockout. The trip was not complex, with all systems responding normally post-trip. One of three […]
Santa Monica, CA, 11/12/2025
"The University of California Los Angeles (UCLA) health [center] reported that a patient being treated for liver cancer underwent a Y-90 Sirtex SirSpheres brachytherapy treatment on November 12, 2025. This is a preliminary report of a medical event, per […]
Santa Monica, CA, 11/12/2025
"The University of California Los Angeles (UCLA) health [center] reported that a patient being treated for liver cancer underwent a Y-90 Sirtex SirSpheres brachytherapy treatment on November 12, 2025. This is a preliminary report of a medical event, per […]
Centertown, KY, 11/12/2025
"The Department was notified on 11/12/2025, by the radiation safety officer (RSO) from Big Rivers Electric Corporation, that during a routine six-month inventory/shutter checks, two sources were identified to have problems with the shutters […]
Centertown, KY, 11/12/2025
"The Department was notified on 11/12/2025, by the radiation safety officer (RSO) from Big Rivers Electric Corporation, that during a routine six-month inventory/shutter checks, two sources were identified to have problems with the shutters […]
Limerick (PA), 11/19/2025
On November 18, 2025, at 0328 CST, as the licensee was initiating the standby gas treatment system in support of planned maintenance on normal reactor building ventilation, the '2A' reactor enclosure recirculation system (RERS) […]
Limerick (PA), 11/19/2025
On November 18, 2025, at 0328 CST, as the licensee was initiating the standby gas treatment system in support of planned maintenance on normal reactor building ventilation, the '2A' reactor enclosure recirculation system (RERS) […]
Palisades (MI), 11/18/2025
"On November 18, 2025, [non-licensed] supervisor violated the station's fitness for duty (FFD) policy. The employee's unescorted access to Palisades Nuclear Plant has been terminated. The event was determined to be reportable under 10CFR26 […]
Palisades (MI), 11/18/2025
"On November 18, 2025, [non-licensed] supervisor violated the station's fitness for duty (FFD) policy. The employee's unescorted access to Palisades Nuclear Plant has been terminated. The event was determined to be reportable under 10CFR26 […]
Dresden (IL), 11/17/2025
"At 1613 CST on November 17, 2025, it was discovered that the single train of high pressure coolant injection (HPCI) was inoperable. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function […]
Dresden (IL), 11/17/2025
"At 1613 CST on November 17, 2025, it was discovered that the single train of high pressure coolant injection (HPCI) was inoperable. Due to this inoperability, the system was in a condition that could have prevented the fulfillment of a safety function […]
Sequoyah (TN), 11/17/2025
"At 0911 EST, on 11/17/2025, it was discovered that both trains of the control room emergency ventilation system were simultaneously inoperable due to an unauthorized door breach of a door in the control room envelope […]
Sequoyah (TN), 11/17/2025
"At 0911 EST, on 11/17/2025, it was discovered that both trains of the control room emergency ventilation system were simultaneously inoperable due to an unauthorized door breach of a door in the control room envelope […]
Oconee (SC), 11/14/2025
"At 2254 EST, on November 14, 2025, with Unit 2 in no mode at zero percent power, an actuation of the emergency AC power system occurred during verification of electrical system alignment. The reason for the Keowee Hydro […]
Oconee (SC), 11/14/2025
"At 2254 EST, on November 14, 2025, with Unit 2 in no mode at zero percent power, an actuation of the emergency AC power system occurred during verification of electrical system alignment. The reason for the Keowee Hydro […]
Clinton (IL), 11/14/2025
"At 1351 CST on 11/14/25, with the unit in mode 1 at 99 percent power, an actuation of the division 1, 2, and 3 emergency diesel generators (EDGs) occurred when a fault occurred on the emergency reserve auxiliary […]
Clinton (IL), 11/14/2025
"At 1351 CST on 11/14/25, with the unit in mode 1 at 99 percent power, an actuation of the division 1, 2, and 3 emergency diesel generators (EDGs) occurred when a fault occurred on the emergency reserve auxiliary […]
Clinton (IL), 11/14/2025
On November 14, 2025, at 1351 CST, while in a system outage window, for the reserve auxiliary transformer 'B' bus work inspections, the emergency reserve auxiliary transformer tripped. This resulted in the loss of offsite power […]
Clinton (IL), 11/14/2025
On November 14, 2025, at 1351 CST, while in a system outage window, for the reserve auxiliary transformer 'B' bus work inspections, the emergency reserve auxiliary transformer tripped. This resulted in the loss of offsite power […]
Commerce City, CO, 11/05/2025
The licensee reported two exit signs, each containing 6.0 Ci of tritium, were lost in Commerce City, Colorado.
Manufacturer: Isolite Corporation
Model Number: SLX60
Colorado Event Number: CO250042
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' […]
Commerce City, CO, 11/05/2025
The licensee reported two exit signs, each containing 6.0 Ci of tritium, were lost in Commerce City, Colorado.
Manufacturer: Isolite Corporation
Model Number: SLX60
Colorado Event Number: CO250042
THIS MATERIAL EVENT CONTAINS A 'Less than Cat 3' […]
Fermi (MI), 11/12/2025
"On November 12, 2025, at approximately 1250 EST, during surveillance testing of the high-pressure coolant injection (HPCI) system the HPCI minimum flow valve (E4150F012) would not open during stroke testing. HPCI had been removed […]
Fermi (MI), 11/12/2025
"On November 12, 2025, at approximately 1250 EST, during surveillance testing of the high-pressure coolant injection (HPCI) system the HPCI minimum flow valve (E4150F012) would not open during stroke testing. HPCI had been removed […]
Callaway (MO), 11/12/2025
"At 0748 CST, on November 12, 2025, Callaway Plant experienced an automatic actuation of the auxiliary feedwater (AFW) system in response to auxiliary feedwater actuation signals (AFAS). A low suction pressure signal was also […]
Callaway (MO), 11/12/2025
"At 0748 CST, on November 12, 2025, Callaway Plant experienced an automatic actuation of the auxiliary feedwater (AFW) system in response to auxiliary feedwater actuation signals (AFAS). A low suction pressure signal was also […]
Breckenridge, CO, 11/07/2025
"A gauge service provider reported that a member of the public had contacted them after finding an uncontrolled portable nuclear gauge. The individual observed the gauge fall from the back of a truck and called the service provider's number displayed […]
Breckenridge, CO, 11/07/2025
"A gauge service provider reported that a member of the public had contacted them after finding an uncontrolled portable nuclear gauge. The individual observed the gauge fall from the back of a truck and called the service provider's number displayed […]
Queen City, TX, 11/07/2025
"On November 7, 2025, the Department was notified by the licensee's radiation safety officer that while removing a Berthold model LB7440 gauge for disposal, the shutter was found in the stuck open position. Open is the normal position for the shutter […]
Queen City, TX, 11/07/2025
"On November 7, 2025, the Department was notified by the licensee's radiation safety officer that while removing a Berthold model LB7440 gauge for disposal, the shutter was found in the stuck open position. Open is the normal position for the shutter […]
Wytheville, VA, 11/06/2025
The VRMP was notified by phone of an incident at a soil compaction project site in Wytheville, VA. At approximately 1120 EST, on November 6, 2025, a Troxler 3440 portable nuclear gauge (S/N 71116, 8 mCi Cs-137 and 40 mCi Am-241) was struck by a motor […]
Wytheville, VA, 11/06/2025
The VRMP was notified by phone of an incident at a soil compaction project site in Wytheville, VA. At approximately 1120 EST, on November 6, 2025, a Troxler 3440 portable nuclear gauge (S/N 71116, 8 mCi Cs-137 and 40 mCi Am-241) was struck by a motor […]
Dallas, TX, 09/11/2025
"On November 6, 2025, the Department received a report from the licensee's radiation safety officer (RSO) stating that they had discovered three under exposure events had occurred using Y-90 TheraSphere beads. The events were discovered during a review of […]
Dallas, TX, 09/11/2025
"On November 6, 2025, the Department received a report from the licensee's radiation safety officer (RSO) stating that they had discovered three under exposure events had occurred using Y-90 TheraSphere beads. The events were discovered during a review of […]
Millstone (CT), 11/06/2025
"On November 6, 2025, at 1014 [EST], it was determined that a licensed supervisory operator was in violation of the licensee's fitness for duty (FFD) policy. The test result was negative but determined to be reportable under 10 CFR 26 […]
Millstone (CT), 11/06/2025
"On November 6, 2025, at 1014 [EST], it was determined that a licensed supervisory operator was in violation of the licensee's fitness for duty (FFD) policy. The test result was negative but determined to be reportable under 10 CFR 26 […]