TRTR Facility Reportable Occurrences

Facility	Event #	Date	Type	Description	Follow-Up	Link
Massachusetts Institute Of Technology Reactor	53157	01/09/2018	Instrumentation / Control	Experiments were moved in the reactor core while required neutron flux monitoring instrumentation was inoperable.	ML18026A626	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180110en.html
Massachusetts Institute Of Technology Reactor	53174	01/18/2018	Instrumentation / Control	Required power monitoring channel failed during operation.	ML18036A187	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180119en.html#en53174
University of Florida Training Reactor	53222	02/20/2018	Instrumentation / Control	Power monitoring channel scram setpoint was set in excess of of license limits	ML18061A118	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180222en.html#en53211
Missouri University Research Reactor	53244	03/05/2018	Instrumentation / Control	Reactor emergency generator was momentarily disabled while the reactor was operating.	ML18078A298	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180306en.html#en53244
Missouri University Research Reactor	53433	05/31/2018	Instrumentation / Control	Failure of a Control Rod Drive Mechanism during operations	ML18164A027	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180531en.html#en53433
Kansas State University Research Reactor	53520	07/21/2018	Emergency Declared	Notification of Unusual Event declared due to gas leak on campus	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180723en.html#en53520
Reed Research Reactor	53725	11/08/2018	Staffing	Reactor key was left in the console unattended for approximately 30 seconds while the reactor was not secured	ML18345A047	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20181108en.html#en53725
Reed Research Reactor	53771	12/03/2018	Staffing	Reactor was unsecured with only a single Reactor Operator present. The required second person was not present.	ML19002A130	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20181204en.html#en53771
Missouri University Research Reactor	53841	01/22/2019	Coolant	Anti-siphon system was momentarily inoperable while the reactor was not secured.	ML19036A613	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190122en.html#en53841
Missouri University Research Reactor	53849	01/28/2019	Instrumentation / Control	Failure of a Control Rod Drive Mechanism during operations	ML19036A612	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190128en.html#en53849
General Electric Nuclear Test Reactor	53983	04/05/2019	Staffing	Violation of minimum staffing requirements during operations when the reactor key was left in the console unattended after the reactor was shutdown	ML19106A359	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190405en.html#en53983
Missouri University Research Reactor	54034	04/29/2019	Instrumentation / Control	Control Rod Drive Mechanism failed during an operation.	ML19134A075	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190430en.html#en54034
Missouri University Research Reactor	54149	07/05/2019	Confinement / Ventilation	Required automatically closing doors were temporarily disabled while the reactor was not secured, violating the requirements for confinement	ML19197A042	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190708en.html#en54149
Missouri University Research Reactor	54187	07/30/2019	Instrumentation / Control	Control Rod Drive Mechanism failed during an operation.	ML19221B563	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20190731en.html#en54187
Armed Forces Radiobiology Research Institute Research Reactor	54349	10/24/2019	Administrative	Fission chamber was declared lost after it could not be located during an annual inventory	ML22263A238	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20191104en.html#en54349
Kansas State University Research Reactor	54421	12/05/2019	Administrative	Tracking error lead to 4 fuel elements not being inspected within the required interval	ML19352E152	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20191206en.html#en54421
Missouri University Research Reactor	54436	12/11/2019	Instrumentation / Control	Control Rod Drive Mechanism failed during an operation.	ML19350A574	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2019/20191212en.html#en54436
University of Utah Training Reactor	54625	03/31/2020	Instrumentation / Control	Control rod drop times exceeded Technical Specification limits	ML20111A113	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20200401en.html#en54625
Washington State University Reactor	54627	04/01/2020	Emergency Declared	Notification of Unusual Event declared due to earthquake	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20200402en.html#en54627
Idaho State University AGN-201M	54628	04/01/2020	Emergency Declared	Notification of Unusual Event declared due to earthquake	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20200406en.html#en54628
Dow Chemical TRIGA Reactor	54719	05/19/2020	Emergency Declared	Notification of Unusual Event declared due to a dam break leading to potential flooding of the reactor site.	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20200522en.html#en54719
Purdue University Reactor - 1	54958	10/20/2020	Power Excursion	The reactor was operated in excess of its licensed power level due to an improper power calibration.	ML20311A264	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20201021en.html#en54958
NIST Center for Neutron Research	55034	12/14/2020	Emergency Declared	Notification of Unusual Event due to elevated release of Ar-41	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2020/20201215en.html#en55034
NIST Center for Neutron Research	55094	02/03/2021	Emergency Declared	Alert due to release of fission product from damaged fuel element, later downgraded to Unusual Event	ML21048A149	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210204en.html#en55094
General Electric Nuclear Test Reactor	55113	02/24/2021	Staffing	Two operators who had gone out of qaulification due to not taking the required annual operating exam in the required time frame operated the reactor.	ML21069A292	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210225en.html#en55113
NIST Center for Neutron Research	55120	03/02/2021	Fuel	Fuel element was damaged when Safety Limit was exceeded	ML21064A523	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210303en.html#en55120
Texas A&M Nuclear Engineering and Science Center	55129	03/09/2021	Power Excursion	The reactor was beleived to have been operated in excess of licensed power levels, but the event was later retracted.	Not Applicable	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210310en.html#en55129
Massachusetts Institute Of Technology Reactor	55212	04/24/2021	Staffing	The reactor was operated with only a single Senior Reactor Operator onsite.	ML21132A251	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210426en.html#en55212
Missouri University of Science and Technology Reactor	55266	05/20/2021	Administrative	Failure to perform required experimental verification of calculated airborne effluent release values every five years	ML21153A432	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210524en.html#en55266
Purdue University Reactor - 1	55359	02/28/2021	Power Excursion	The reactor was operated in excess of its licensed power level due to an improper power calibration.	ML21181A403	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210720en.html#en55359
Missouri University Research Reactor	55380	07/26/2021	Instrumentation / Control	Control Rod Drive Mechanism failed during an operation.	ML21221A325	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210728en.html#en55380
University of Utah Training Reactor	55399	08/05/2021	Coolant	Exceeded Technical Specification limits for pool water conductivity and pH following an operation. This was believed to be due to an algaecide water treatment added to the pool several days prior to the operation.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20210809en.html#en55399
Missouri University Research Reactor	55516	10/11/2021	Instrumentation / Control	Required primary coolant pressure scram channel setpoint was found to be out of the required range.	ML21298A197	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211013en.html#en55516
Missouri University Research Reactor	55568	11/08/2021	Instrumentation / Control	Required pool level measurement channel was found to not actuate a run-in within the required level range.	ML21327A304	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211112en.html#en55568
Missouri University Research Reactor	55583	11/15/2021	Instrumentation / Control	Required flow rate scram channel was found to be inoperable.	ML21327A305	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211117en.html#en55583
Penn State Breazeale Reactor	55632	12/08/2021	Power Excursion	Operator error while operating in square wave mode lead to an inadvertent reactivity insertion. The resulting short period caused the reactor power to overshoot the maximum licensed power level before the reactor scrammed.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2021/20211209en.html#en55632
Ohio State Research Reactor	55739	02/15/2022	Confinement / Ventilation	Required exhaust fan failed during operations when a conduit carrying its power was accidentally cut through while a sink was being replaced.	ML22060A104	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20220217en.html#en55739
NC State University PULSTAR Reactor	55747	02/17/2022	Instrumentation / Control	Power channel dropped to a reading of 20% of power while the reactor was operating at 95% of full power.	ML22061A034	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20220218en.html#en55747
University of Utah Training Reactor	55914	05/24/2022	Fuel	Damaged fuel element was identified during a fuel inspection. The element was seen to have surface pitting and was discolored. As it was moved, bubbles began to emerge from the element, so the fuel cladding was believed to have failed.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20220526en.html#en55914
University of Texas - Austin Nuclear Engineering Teaching Laboratory	56198	11/02/2022	Fuel	Between January and October 2022 the reactor operated with 2 aluminum clad TRIGA fuel elements. The facility is only licensed for operations with stainless steel clad elements. There was no indication of any fuel damage or radioactive material released.	ML22322A114	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2022/20221103en.html#en56198
Missouri University Research Reactor	56296	09/22/2022	Staffing	An operator continued to perform licensed duties after the expiration of their license.	ML23017A207	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230106en.html#en56296
Reed Research Reactor	56308	01/11/2023	Confinement / Ventilation	Exhaust fan failed during the movement of irradiated fuel causing the ventilation system to become inoperable.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230112en.html#en56308
University of New Mexico AGN-201 Reactor	56313	11/23/2022	Power Excursion	High Power Scram caused by operator error.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230119en.html#en56313
University of California, Davis McClellan Nuclear Research Center	56331	01/31/2023	Coolant	Tritium concentrations in the pool water were found to be in excess of license limits. This was due to an incorrect tritium analysis during the relicensing process having led to the limit for tritium being set too low to be achieved.	ML23039A207	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230202en.html#en56331
Texas A&M Nuclear Engineering and Science Center	56489	04/25/2023	Instrumentation / Control	Required Area Radiation Monitor display in the Emergency Support Center was inoperable.	ML24350A006	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230427en.html#en56489
Missouri University Research Reactor	56534	05/23/2024	Instrumentation / Control	A single control blade was 1.4 inches below the other 3 while the reactor was operating above 100 kW	ML23157A214	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230524en.html#en56534
NC State University PULSTAR Reactor	56553	06/02/2023	Instrumentation / Control	Failure of a power monitoring safety channel (faulty high voltage power supply) was observed during an operation.	ML23163A190	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230605en.html#en56553
Texas A&M Nuclear Engineering and Science Center	56595	06/28/2023	Fuel	Fuel element that failed to pass inspection due to swelling. The entire core was inspected following this finding.	ML24350A003	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230703en.html#en56595
University of New Mexico AGN-201 Reactor	56602	06/30/2023	Administrative	Failure to complete alarm testing within the required 7.5 month interval.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230703en.html#en56602
University of California, Davis McClellan Nuclear Research Center	56643	07/27/2023	Fuel	A fuel element was found with unusual pitting and discoloration during a fuel inspection. All fuel elements that had not been inspected within the last year were inspected.	ML23222A187	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20230731en.html#en56643
Missouri University of Science and Technology Reactor	56878	12/01/2023	Instrumentation / Control	A failed amplifier caused a high power scram indication. This was considered a reactor safety system component malfunction. Actual reactor power remained at normal levels during the event.	ML23349A206	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2023/20231206en.html#en56878
Texas A&M Nuclear Engineering and Science Center	56898	12/15/2023	Instrumentation / Control	It was found that the confinement pressure monitor was not tied into the trip system and was not visible to operators in the control room leading to a potential violation of the Limiting Conditions for Operation. This event was later withdrawn.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20241216en.html#en56898
University of New Mexico AGN201	56927	01/17/2024	Staffing	After directing a trainee to shut down the reactor, the Reactor Operator left the control room while the key remained in the reactor console.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240119en.html#en56927
Reed Research Reactor	57014	03/07/2024	Staffing	Reactor key was left in the console unattended for approximately 20 minutes following a planned shutdown.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240308en.html#en57014
Oregon State University TRIGA Reactor	57113	05/07/2024	Staffing	Following a reactor shutdown, there was an indication that one control rod was not fully inserted. Both the reactor operator and reactor engineer left the control room to investigate, leaving it unattended, and discovered that one control rod was not fully inserted meaning that the reactor was not secured.	ML24145A126	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240509en.html#en57113
Missouri University Research Reactor	57125	05/10/2024	Confinement / Ventilation	Tech Spec required filter monitors were not positioned on the correct filter banks. There was no evidence of any radioactive material release.	ML24145A182	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240514en.html#en57125
Texas A&M Nuclear Engineering and Science Center	57174	06/14/2024	Fuel	2 fuel elements were found to be outside of the Tech Spec limit for transverse bend during fuel inspection.	ML24350A004	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240626en.html#en57174
Missouri University Research Reactor	57180	06/17/2024	Confinement / Ventilation	Exhaust filters were found to have not been meeting Technical Specification requirements between July 2022 and April 2024.	ML24184A113	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240620en.html#en57180
US Geological Survey TRIGA Reactor	57191	06/25/2024	Fuel	Numerous fuel elements failed visual inspections.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240809en.html#en57191
NC State University PULSTAR Reactor	57196	06/27/2024	Instrumentation / Control	Required power monitoring channel failed during operation.	ML24193A107	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240628en.html#en57196
Maryland University Training Reactor	57207	07/03/2024	Confinement / Ventilation	Operator momentarily switched on a ventilation fan while the reactor was not secured, violating the Technical Specifications for Confinement.	Not Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240705en.html#en57207
Missouri University of Science and Technology Reactor	57239	07/24/2024	Staffing	Key was left unattended in the reactor console after the reactor was shutdown.	ML24221A288	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240725en.html#en57239
Missouri University Research Reactor	57382	10/14/2024	Instrumentation / Control	A required scram channel (Fluxtrap Irradiations Reactivity Safety Trip) was found to be inoperable during pre-startup checks.	ML24299A074	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20241016en.html#en57382
Missouri University Research Reactor	57445	11/25/2024	Instrumentation / Control	The switch which allows control blades to be selected for manual operation failed during an operation.	ML24344A113	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20241127en.html#en57445
Massachusetts Institute Of Technology Reactor	57487	01/06/2025	Staffing	The reactor key was left unattended in the console for approximately 3 minutes while the reactor was not secured.	ML25021A251	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250107en.html#en57487
Penn State Breazeale Reactor	57545	02/14/2025	Instrumentation / Control	The reactor was pulsed with a required power monitoring channel bypassed, so pulse power was not recorded.	ML25052A222	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250218en.html#en57545
Armed Forces Radiobiology Research Institute Research Reactor	57730	05/22/2025	Power Excursion	The Log Channel malfunctioned and failed to provide a period signal. This lead to a power overshoot and the reactor momentarily exceeded its licenesed power level.	ML25041A137	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250523en.html#en57730
Massachusetts Institute Of Technology Reactor	57824	07/24/2025	Confinement / Ventilation	The console key switch was inserted while not having containment integrity. The reactor was shut down at the time.	Not Yet Available	https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250725en.html#en57824
Facility	Event #	Date	Type	Description	Follow-Up	Link