Event Notification Report for November 25, 2024
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/24/2024 - 11/25/2024
EVENT NUMBERS
57445
57445
Non-Power Reactor
Event Number: 57445
Rep Org: University of Missouri - Columbia
Licensee: University of Missouri - Columbia
Region: 0
City: Columbia State: MO
County: Boone
License #: R-103
Agreement: N
Docket: 0500123
NRC Notified By: Deborah Farnsworth
HQ OPS Officer: Robert A. Thompson
Licensee: University of Missouri - Columbia
Region: 0
City: Columbia State: MO
County: Boone
License #: R-103
Agreement: N
Docket: 0500123
NRC Notified By: Deborah Farnsworth
HQ OPS Officer: Robert A. Thompson
Notification Date: 11/26/2024
Notification Time: 14:13 [ET]
Event Date: 11/25/2024
Event Time: 14:40 [CST]
Last Update Date: 11/27/2024
Notification Time: 14:13 [ET]
Event Date: 11/25/2024
Event Time: 14:40 [CST]
Last Update Date: 11/27/2024
Emergency Class: Non Emergency
10 CFR Section:
10 CFR Section:
Person (Organization):
Jessica Lovett (NRR)
Edward Helvenston (NRR)
Andy Waugh (NRR)
Jessica Lovett (NRR)
Edward Helvenston (NRR)
Andy Waugh (NRR)
EN Revision Imported Date: 11/27/2024
EN Revision Text: TECHNICAL SPECIFICATION ABNORMAL OCCURRENCE
The following report was provided by the licensee via email:
"This event is being reported as an 'Abnormal Occurrence,' per the University of Missouri Research Reactor technical specification (TS) 6.6.c, which requires 'Abnormal Occurrences,' defined by TS 1.1, be promptly reported to the NRC Operations Center within one working day.
"At approximately 1440 CST on 11/25/24, during the banking of all four control rods at 50 kW, the '1S3' control blade selector switch became inoperable. The control blade selector switch allows selection of the control blades for manual operation. The inability to select control blades for manual operation resulted in a violation of TS 3.2.a, which requires all control blades, including the regulating blade, be operable during reactor operation.
"The reactor was immediately scrammed and placed in a safe shutdown condition. All applicable safety functions were completed as expected. As a result, there was no impact on the health and safety of the public or facility staff due to this condition. Investigation determined that the internal spring of the '1S3' switch had failed, preventing the switch from selecting a specific control blade for manual control. The spring was replaced and approval to proceed per TS 6.4.c was obtained from the reactor facility director. Post-maintenance testing was completed at 1525 CST on 11/25/24, prior to returning the reactor to normal operations."
The NRC project manager has been notified.
EN Revision Text: TECHNICAL SPECIFICATION ABNORMAL OCCURRENCE
The following report was provided by the licensee via email:
"This event is being reported as an 'Abnormal Occurrence,' per the University of Missouri Research Reactor technical specification (TS) 6.6.c, which requires 'Abnormal Occurrences,' defined by TS 1.1, be promptly reported to the NRC Operations Center within one working day.
"At approximately 1440 CST on 11/25/24, during the banking of all four control rods at 50 kW, the '1S3' control blade selector switch became inoperable. The control blade selector switch allows selection of the control blades for manual operation. The inability to select control blades for manual operation resulted in a violation of TS 3.2.a, which requires all control blades, including the regulating blade, be operable during reactor operation.
"The reactor was immediately scrammed and placed in a safe shutdown condition. All applicable safety functions were completed as expected. As a result, there was no impact on the health and safety of the public or facility staff due to this condition. Investigation determined that the internal spring of the '1S3' switch had failed, preventing the switch from selecting a specific control blade for manual control. The spring was replaced and approval to proceed per TS 6.4.c was obtained from the reactor facility director. Post-maintenance testing was completed at 1525 CST on 11/25/24, prior to returning the reactor to normal operations."
The NRC project manager has been notified.