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. |
| 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 | |
Univ Of Missouri-Columbia with Non | |
WEEKMONTHYEARENS 553802021-07-26T22:31:00026 July 2021 22:31:00
[Table view]Non Reactor Shutdown Due to Control Rod Drive Failure ENS 546602020-04-09T19:32:0009 April 2020 19:32:00 Non Abnormal Occurrence ENS 546532020-04-08T06:00:0008 April 2020 06:00:00 Non Research and Test Reactor Forced Shutdown Due to Failure of Regulating Blade Drive Mechanism ENS 544532019-12-20T03:21:00020 December 2019 03:21:00 Non Technical Specification Deviation ENS 544362019-12-10T06:12:00010 December 2019 06:12:00 Non Technical Specification Violation Requiring Shutdown ENS 541872019-07-30T00:03:00030 July 2019 00:03:00 Non Technical Specification Deviation ENS 540342019-04-28T11:33:00028 April 2019 11:33:00 Non Control Blade Inoperable ENS 538492019-01-28T01:13:00028 January 2019 01:13:00 Non Control Blade Inoperable ENS 538412019-01-21T18:35:00021 January 2019 18:35:00 Non Deviation of Ts 3.3.A(1) for Anti-Siphon Device Found Inoperable ENS 534332018-05-30T12:10:00030 May 2018 12:10:00 Non Technical Specification Deviation ENS 532442018-03-04T09:08:0004 March 2018 09:08:00 Non Technical Specification Deviation ENS 531422017-12-30T13:17:00030 December 2017 13:17:00 Non Technical Specification Required Report for an Abnormal Occurrence ENS 528412017-07-05T05:00:0005 July 2017 05:00:00 Non Abnormal Occurrence Due to Source Range Inoperability During Reactor Start-Up ENS 527022017-04-20T19:49:00020 April 2017 19:49:00 Non Technical Specification Required Report for an Abnormal Occurrence 2021-07-26T22:31:00 | |