NRC Event Notification Reports
whoopsie.mastodon.tds.xyz.ap.brid.gy
NRC Event Notification Reports
@whoopsie.mastodon.tds.xyz.ap.brid.gy
I share the Event Notifications published daily by the US Nuclear Regulatory Commission.

[bridged from https://mastodon.tds.xyz/@whoopsie on the fediverse by https://fed.brid.gy/ ]
EN Revision Imported Date: 11/26/2025
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 26, 2025 at 3:11 PM
STUCK OPEN SHUTTER
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 26, 2025 at 2:42 PM
MEDICAL EVENT
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 26, 2025 at 2:12 PM
LOST EXIT SIGNS
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' […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 25, 2025 at 3:41 PM
LOST EXIT SIGNS
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 25, 2025 at 3:11 PM
LOST CHROMATOGRAPH
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 25, 2025 at 2:41 PM
LOST SOURCES
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 25, 2025 at 2:11 PM
AUTOMATIC REACTOR TRIP
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 24, 2025 at 2:11 PM
MEDICAL EVENT
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 21, 2025 at 2:42 PM
GAUGE SHUTTER FAILURE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 21, 2025 at 2:12 PM
LOSS OF REACTOR ENCLOSURE RECIRCULATION
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) […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 20, 2025 at 2:12 PM
FITNESS FOR DUTY VIOLATION
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 19, 2025 at 2:41 PM
HPCI INOPERABLE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 19, 2025 at 2:13 PM
CONTROL ROOM EMERGENCY VENTILATION SYSTEM INOPERABLE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 18, 2025 at 2:13 PM
AUTOMATIC ACTUATION OF EMERGENCY AC POWER SYSTEM
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 17, 2025 at 3:42 PM
AUTOMATIC ACTUATION OF EMERGENCY DIESEL GENERATORS
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 17, 2025 at 3:12 PM
LOSS OF ALL OFFSITE POWER TO VITAL BUSSES
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 17, 2025 at 2:41 PM
LOST EXIT SIGNS
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' […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 17, 2025 at 2:12 PM
HIGH PRESSURE COOLANT INJECTION INOPERABLE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 4:41 PM
ACTUATION OF AUXILIARY FEEDWATER SYSTEM
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 4:11 PM
RECOVERED GAUGE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 3:41 PM
STUCK OPEN 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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 3:11 PM
DAMAGED GAUGE
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 2:42 PM
MEDICAL EVENT
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 14, 2025 at 2:11 PM
FITNESS FOR DUTY EVENT
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 […]
Original post on mastodon.tds.xyz
mastodon.tds.xyz
November 7, 2025 at 2:42 PM