ENS 57948: Difference between revisions

From kanterella

Revision as of 06:45, 25 September 2025

v t e 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.

ENS 57948 +/-
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
v • d • e

v t e Emergency Notification System
University Of New Mexico with
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[ENS list for University Of New Mexico]

@@ Line 16: / Line 16: @@
 | event date = 09/24/2025 15:11 MDT
 | last update date = 09/24/2025
-| title =
+| title = NON-POWER Reactor - Unplanned HIGH-POWER Trip
-| event text =
+| event text = 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.
 | URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2025/20250925en.html#en57948
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