ENS 41243: Difference between revisions
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| event date = 12/04/2004 04:17 EST | | event date = 12/04/2004 04:17 EST | ||
| last update date = 12/04/2004 | | last update date = 12/04/2004 | ||
| title = Automatic Reactor Scram Due | | title = Automatic Reactor Scram Due to an Auto Voltage Regulator Trip | ||
| event text = On December 4, 2004 at 0417 [EST], the Reactor Scrammed as the result of an AVR [Automatic Voltage Regulator] trip. AVR Channels A and B were both operating at the time. The AVR trip caused a Main Generator trip which caused a Main Turbine trip. The Main Turbine trip causes a direct Reactor SCRAM on Turbine Valve position. RPS functioned properly and all rods inserted [fully]. MSIVs remain open with Reactor Level being maintained in the normal band of 173 to 214 inches. Reactor Pressure is being maintained with the Main Turbine Bypass valves. Isolations expected for Reactor Level 3 occurred and have been reset. | | event text = On December 4, 2004 at 0417 [EST], the Reactor Scrammed as the result of an AVR [Automatic Voltage Regulator] trip. AVR Channels A and B were both operating at the time. The AVR trip caused a Main Generator trip which caused a Main Turbine trip. The Main Turbine trip causes a direct Reactor SCRAM on Turbine Valve position. RPS functioned properly and all rods inserted [fully]. MSIVs remain open with Reactor Level being maintained in the normal band of 173 to 214 inches. Reactor Pressure is being maintained with the Main Turbine Bypass valves. Isolations expected for Reactor Level 3 occurred and have been reset. | ||
Previous to the reactor scram, the AVR alarm was being monitored. All other safety systems functioned as required. Similar event occurred 09/04/04 (EN#41017). | Previous to the reactor scram, the AVR alarm was being monitored. All other safety systems functioned as required. Similar event occurred 09/04/04 (EN#41017). | ||
Latest revision as of 22:22, 1 March 2018
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000341/LER-2004-004 |
| Time - Person (Reporting Time:+-4.17 h-0.174 days <br />-0.0248 weeks <br />-0.00571 months <br />) | |
| Opened: | P. Fallon 05:07 Dec 4, 2004 |
| NRC Officer: | Arlon Costa |
| Last Updated: | Dec 4, 2004 |
| 41243 - NRC Website
| |