ENS 54653

v t e ENS Event
06:00 Apr 8, 2020
Title	Research and Test Reactor Forced Shutdown Due to Failure of Regulating Blade Drive Mechanism
Event Description	On 4/8/20 at 0100 CDT, the University of Missouri-Columbia Research Reactor (MURR) was shut down due to a failure of the regulating blade drive mechanism to move the regulating blade during reactor operation. This email is a required notification per MURR Technical Specification (TS) 6.6.c.(1) to report to the NRC Operations Center that an Abnormal Occurrence, as defined by MURR TS 1.1, had occurred. Specifically, MURR was not in compliance with all Limiting Conditions for Operations (LCOs). MURR was not in compliance with two (2) LCOs: 1. TS 3.2.a states, 'All control blades, including the regulating blade, shall be operable during reactor operation,' and 2. TS 3.2.f states, 'The reactor shall not be operated unless the following rod run-in functions are operable.' Specifically, the rod run-in function that occurs when the regulating blade position is less than or equal to 10 percent withdrawn was not operable as TS 3.2.f.8 requires. The regulating blade drive mechanism was repaired, post-maintenance operability testing was conducted on the regulating blade, and permission from the Reactor Facility Director was obtained prior to the reactor returning to operation later on 4/8/20. Currently, MURR is at 10 MW. A detailed event report will follow within 14 days as required by MURR TS 6.6.c.(3).

ENS 54653 +/-
Where
Univ Of Missouri-Columbia Columbia, Missouri (NRC Region 0)
License number:	R-103
Reporting

Non
Time - Person (Reporting Time:+27.58 h1.149 days <br />0.164 weeks <br />0.0378 months <br />)
Opened:	Bruce Meffert 09:35 Apr 9, 2020
NRC Officer:	Howie Crouch
Last Updated:	Apr 9, 2020
54653 - NRC Website
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v t e Emergency Notification System
Univ Of Missouri-Columbia with Non
WEEKMONTHYEAR2021-07-26T22:31:00 [Table view]
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