ENS 53849
From kanterella
Revision as of 08:30, 1 January 2020 by StriderTol (talk | contribs) (Created page by program invented by StriderTol)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
ENS Event | |
|---|---|
01:13 Jan 28, 2019 | |
| Title | Control Blade Inoperable |
| Event Description | On January 27, 2019, at 1913 CST, with the University of Missouri-Columbia Research Reactor (MURR) operating at 10 MW in the automatic control mode, the Lead Senior Reactor Operator (LSRO) was conducting surveillance Technical Specification (TS) 4.2.a, which states, 'All control blades, including the regulating blade, shall be verified operable within a shift.' During this shiftily verification of control blade operability, all blades were initially verified operable. However, when banking the control blades to their final position after all blades were satisfactorily tested a few seconds earlier, shim control blade 'A' would not move in the inward direction. The LSRO then immediately shut down the reactor by initiating a manual scram by placing the Master Control Switch 1S1 to the 'TEST' position. The LSRO completed all immediate and subsequent actions of reactor emergency procedure REP-2, 'Reactor Scram,' and verified all shim control blades were fully inserted.
The inability to manually insert shim control blade 'A' with Control Rod Operate Switch 1S4, which inserts and withdraws the control blade, is a deviation from TS 3.2.a, which states, 'All control blades, including the regulating blade, shall be operable during reactor operation.' Troubleshooting revealed a problem with an electrical contact on Control Rod Operate Switch 1S4, and it has since been replaced. The reactor has not returned to operation at the time of this email. However, permission from the Reactor Facility Director has been obtained to restart the reactor once scheduled maintenance activities have been completed. 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:+13.8 h0.575 days <br />0.0821 weeks <br />0.0189 months <br />) | |
| Opened: | Bruce Meffert 15:01 Jan 28, 2019 |
| NRC Officer: | Brian P. Smith |
| Last Updated: | Jan 28, 2019 |
| 53849 - 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 | |
Retrieved from "https://kanterella.com/w/index.php?title=ENS_53849&oldid=2294845"