ENS Event | |
|---|---|
09:15 Mar 25, 2012 | |
| Title | Research Reactor Manual Scram |
| Event Description | At 0356 hrs. EDT, while operating at full power, the reactor automatically scrammed on a high signal on period channel 3. At that time, it was believed that the scram was due to noise on the channel. All channels were checked and at 0449 hrs. it was decided that to restart the reactor.
During the startup, the rods were pulled to the estimated critical position (ECP) without indication on any of the period channels (3 channels installed). It was decided that the xenon could be precluding the reactor so it was decided to bump the rods out. After bumping out the rods, no increase in period was indicated. During the ensuing discussion, the operator observed power increasing and, at approximately 4 Mw, decided to manually scram the reactor. Investigation into this event is ongoing. |
| Where | |
|---|---|
| Massachusetts Institute Of Tech Cambridge, Massachusetts (NRC Region 1) | |
| License number: | R-37 |
| Reporting | |
| Non | |
| Time - Person (Reporting Time:+24.82 h1.034 days <br />0.148 weeks <br />0.034 months <br />) | |
| Opened: | Tom Newton 10:04 Mar 26, 2012 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Mar 26, 2012 |
| 47770 - NRC Website | |
Massachusetts Institute Of Tech with Non | |
WEEKMONTHYEARENS 531742018-01-17T17:28:00017 January 2018 17:28:00
[Table view]Non Non-Power Reactor Manually Scrammed ENS 531572018-01-08T21:00:0008 January 2018 21:00:00 Non Technical Specification Violation ENS 477702012-03-25T09:15:00025 March 2012 09:15:00 Non Research Reactor Manual Scram ENS 472292011-08-12T22:00:00012 August 2011 22:00:00 Non Potential Violation of Technical Specifications ENS 467842011-04-24T11:00:00024 April 2011 11:00:00 Non Violation of Technical Specification 3.2.3, Reactor Protection System ENS 467832011-04-22T02:30:00022 April 2011 02:30:00 Non Violation of Technical Specification 3.3.2.2, Core Purge Blower 2018-01-08T21:00:00 | |