ENS 44942: Difference between revisions
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| event date = 03/28/2009 01:46 EDT | | event date = 03/28/2009 01:46 EDT | ||
| last update date = 03/28/2009 | | last update date = 03/28/2009 | ||
| title = Reactor Scram Due | | title = Reactor Scram Due to Mode Switch Being Placed in Shutdown Following High Vibration on Main Turbine #1 Bearing | ||
| event text = At 0146 EDT 3/28/09, the reactor mode switch was taken to shutdown in response to high vibration levels on the Main Turbine #1 bearing. Reactor power was at its reduced level in preparation for entry into Refueling Outage #13 which was scheduled to begin at 0300 EDT. All control rods fully inserted into the core. The lowest reactor vessel water level reached was 162 inches. HPCI & RCIC did not initiate. No safety relief valves (SRV) actuated. Reactor water level is being controlled in the normal band using the Control Rod Drive (CRD) system. All isolations and actuations for reactor vessel water level 3 occurred. | | event text = At 0146 EDT 3/28/09, the reactor mode switch was taken to shutdown in response to high vibration levels on the Main Turbine #1 bearing. Reactor power was at its reduced level in preparation for entry into Refueling Outage #13 which was scheduled to begin at 0300 EDT. All control rods fully inserted into the core. The lowest reactor vessel water level reached was 162 inches. HPCI & RCIC did not initiate. No safety relief valves (SRV) actuated. Reactor water level is being controlled in the normal band using the Control Rod Drive (CRD) system. All isolations and actuations for reactor vessel water level 3 occurred. | ||
The cause of the high main turbine vibrations is currently under investigation. There was no maintenance or testing in progress that would explain the high turbine vibration levels. At the time of the scram all ECCS systems and Emergency Diesel Generators were operable. This report is being made in accordance with 10CFR50.72(b)(2)(iv)(B), any event that results in actuation of the reactor protection system (RPS) when the reactor is critical. | The cause of the high main turbine vibrations is currently under investigation. There was no maintenance or testing in progress that would explain the high turbine vibration levels. At the time of the scram all ECCS systems and Emergency Diesel Generators were operable. This report is being made in accordance with 10CFR50.72(b)(2)(iv)(B), any event that results in actuation of the reactor protection system (RPS) when the reactor is critical. | ||
Latest revision as of 22:12, 1 March 2018
| Where | |
|---|---|
Fermi  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000341/LER-2009-001 |
| Time - Person (Reporting Time:+-2.02 h-0.0842 days <br />-0.012 weeks <br />-0.00277 months <br />) | |
| Opened: | Geoffrey Miller 03:45 Mar 28, 2009 |
| NRC Officer: | Donald Norwood |
| Last Updated: | Mar 28, 2009 |
| 44942 - NRC Website
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