ENS Event | |
|---|---|
21:11 Sep 24, 2025 | |
| Title | NON-POWER Reactor - Unplanned HIGH-POWER Trip |
| Event Description | The following information was summarized from the licensee via phone and email: On September 24, 2025, at 1511 MDT, a high-power trip occurred (operation of safety channels 2 and 3). The reactor was being operated by a senior reactor operator (SRO) and a student authorized operator. A positive-period excess reactivity measurement was being performed. The reactor power rose to 5.64 watts. The technical specifications power limit of 6 watts plus was not exceeded, and both safety channels functioned to shut the reactor down. This prompt notification for a high-power trip is in accordance with current procedures and technical specification 6.9.2.a.7. The proximate cause of this event was operator distraction. The reactor room had two visitors at the time of the event, an NRC inspector and a University of New Mexico nuclear engineering instructor. The instructor was engaging the student authorized operator and the SRO on matters relating to a laboratory activity ongoing in another part of the building. The SRO responded to the rising power too slowly to avoid the high-power trip. |
| Where | |
|---|---|
| University Of New Mexico Albuquerque, New Mexico (NRC Region 0) | |
| License number: | R-102 |
| Organization: | Univ Of New Mexico (Newm) |
| Reporting | |
| Time - Person (Reporting Time:+-3.83 h-0.16 days <br />-0.0228 weeks <br />-0.00525 months <br />) | |
| Opened: | Carl Willis 17:21 Sep 24, 2025 |
| NRC Officer: | Ernest West |
| Last Updated: | Sep 24, 2025 |
| 57948 - NRC Website | |
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