ENS Event | |
|---|---|
19:57 Aug 24, 2008 | |
| Title | Manual Reactor Trip Due to Feedwater Flow Oscillations |
| Event Description | The 'A' Condensate Pump became uncoupled, lowering Condensate flow. Operators began to manually lower reactor power to maintain deaerator level. Reactor power was lowered to approximately 62 percent. At this power, [feedwater] flow oscillations began and were excessive. With these flow oscillations increasing the decision was made to manually trip the Reactor. The Reactor was manually tripped at 1557 hours0.018 days <br />0.433 hours <br />0.00257 weeks <br />5.924385e-4 months <br />. There were no safety system actuations other than RPS (Manual). The plant is stable in a normal post trip configuration.
All control rods inserted into the core during the reactor trip. Offsite power is available and powering safety loads. The steam generator safeties lifted during the transient and reseated. There is no known primary to secondary leakage. Decay heat is being removed via steam dumps to the condenser using normal feedwater to the steam generator. The emergency feedwater system was not initiated during the reactor trip. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Crystal River  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation | |
| LER: | 05000302/LER-2008-003 Manual Reactor Trip Due to Main Feedwater System Oscillations Caused by an Inconsistent Procedure |
| Time - Person (Reporting Time:+-1.9 h-0.0792 days <br />-0.0113 weeks <br />-0.0026 months <br />) | |
| Opened: | William Kisner 18:03 Aug 24, 2008 |
| NRC Officer: | Vince Klco |
| Last Updated: | Aug 24, 2008 |
| 44438 - NRC Website
Loading map... | |
Unit 3 | |
|---|---|
| Reactor critical | Critical |
| Scram | Yes, Manual Scram |
| Before | Power Operation (100 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 452862009-08-24T15:00:00024 August 2009 15:00:00
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