ENS 52062: Difference between revisions
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| event date = 07/01/2016 09:14 MDT | | event date = 07/01/2016 09:14 MDT | ||
| last update date = 07/05/2016 | | last update date = 07/05/2016 | ||
| title = Usgs Research Reactor Scram Due | | title = Usgs Research Reactor Scram Due to One of Three Power Instruments Not Functioning | ||
| event text = At 0914 MDT on 7/1/16, a routine GSTR [Geological Survey TRIGA Reactor] startup and ascent to 900 kW was initiated after successful completion of the daily prestart checks and an excess reactivity check. At 0919 as power was passing through approximately 50 kW, it was clear to the operator that one of the three power instruments (the NP1000) was not functioning since it was still reading 0 percent when it should have been reading >5 percent. The reactor was scrammed, Reactor Supervisor notified, and troubleshooting commenced. Shortly after this, the NP1000 signal cable was found to have an intermittent connection through a tee connector that was installed at the instrument box. The connector was replaced to resolve the problem and tested satisfactorily. At 1050 the reactor was started up again. All power instrumentation operated correctly and the daily power operation was performed without further problems. | | event text = At 0914 MDT on 7/1/16, a routine GSTR [Geological Survey TRIGA Reactor] startup and ascent to 900 kW was initiated after successful completion of the daily prestart checks and an excess reactivity check. At 0919 as power was passing through approximately 50 kW, it was clear to the operator that one of the three power instruments (the NP1000) was not functioning since it was still reading 0 percent when it should have been reading >5 percent. The reactor was scrammed, Reactor Supervisor notified, and troubleshooting commenced. Shortly after this, the NP1000 signal cable was found to have an intermittent connection through a tee connector that was installed at the instrument box. The connector was replaced to resolve the problem and tested satisfactorily. At 1050 the reactor was started up again. All power instrumentation operated correctly and the daily power operation was performed without further problems. | ||
The NP1000 is a required safety instrument for operation of the reactor, so malfunction of the instrument is a violation of the facility's Technical Specifications. | The NP1000 is a required safety instrument for operation of the reactor, so malfunction of the instrument is a violation of the facility's Technical Specifications. | ||
Latest revision as of 20:44, 1 March 2018
| Where | |
|---|---|
| U. S. Geological Survey Denver, Colorado (NRC Region 0) | |
| License number: | R-113 |
| Reporting | |
| Research And Test Reactor Event | |
| Time - Person (Reporting Time:+95.7 h3.988 days <br />0.57 weeks <br />0.131 months <br />) | |
| Opened: | Tim Debey 14:56 Jul 5, 2016 |
| NRC Officer: | Jeff Herrera |
| Last Updated: | Jul 5, 2016 |
| 52062 - NRC Website | |