ENS 52841
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ENS Event | |
|---|---|
05:00 Jul 5, 2017 | |
| Title | Abnormal Occurrence Due to Source Range Inoperability During Reactor Start-Up |
| Event Description | On 7/4/17 at 0232 CDT, the University of Missouri-Columbia Research Reactor (MURR) was shut down due to the suspected inoperability of the Source Range Nuclear Instrument Channel during reactor startup. This 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 TS 3.5.a.3. and its associated note (1). TS 3.5.a.3 states, 'The reactor shall not be operated unless the following instrument channels are operable: ...3. Source Range Nuclear Instrument Channel...'. Note (1) clarifies that the Source Range Nuclear Instrument Channel is 'required for reactor startup only.' During the first rod withdrawal of the reactor startup, the Source Range Nuclear Instrument Channel indication was erratic. Therefore, it was decided to shut down the reactor.
The Source Range Nuclear Instrument Channel was repaired by replacing two power supplies in its instrument drawer, the required compliance procedures were conducted on the nuclear instrument, and permission from the Facility Director was obtained prior to the reactor returning to operation later on 7/4/17. Currently, MURR is at 10 MW. A detailed event report will follow within 14 days as required by MURR TS 6.6.c.(3). |
| Where | |
|---|---|
| Univ Of Missouri-Columbia Columbia, Missouri (NRC Region 0) | |
| License number: | R-103 |
| Reporting | |
| Non | |
| Time - Person (Reporting Time:+11.32 h0.472 days <br />0.0674 weeks <br />0.0155 months <br />) | |
| Opened: | Bruce Meffert 16:19 Jul 5, 2017 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Jul 5, 2017 |
| 52841 - NRC Website | |
Univ Of Missouri-Columbia with Non | |
WEEKMONTHYEARENS 553802021-07-26T22:31:00026 July 2021 22:31:00
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