ENS 55380

v t e ENS Event
22:31 Jul 26, 2021
Title	Reactor Shutdown Due to Control Rod Drive Failure
Event Description	On July 26, 2021 at 1731 CDT, while the reactor was subcritical during a reactor startup, the University of Missouri-Columbia Research Reactor (MURR) was manually shut down due to the failure of the control rod drive mechanism for shim control blade B. MURR was not in compliance with one (1) Limiting Conditions of Operations (LCO). TS 3.2.a states, 'All control blades, including the regulating blade, shall be operable during reactor operation.' A spare control rod drive mechanism was installed for control blade B, post-installation operability testing was conducted satisfactorily, and permission from the Reactor Facility Director was obtained prior to the reactor returning to operation later on July 26, 2021. Currently, MURR is operating at 10 MW [full power]. A detailed event report will follow within 14 days.

ENS 55380 +/-
Where
Univ Of Missouri-Columbia Columbia, Missouri (NRC Region 3)
License number:	R-103
Reporting

Non
Time - Person (Reporting Time:+15.42 h0.643 days <br />0.0918 weeks <br />0.0211 months <br />)
Opened:	Bruce Meffert 13:56 Jul 27, 2021
NRC Officer:	Thomas Herrity
Last Updated:	Jul 27, 2021
55380 - NRC Website
v • d • e

v t e Emergency Notification System
Univ Of Missouri-Columbia with Non
WEEKMONTHYEAR2021-07-26T22:31:00 [Table view]
[ENS list for Univ Of Missouri-Columbia]

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