Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 49707 | 9 January 2014 18:56:00 | On January 9, 2014 St. Lucie Unit 1 declared an Unusual Event based on a severe rain storm, a natural occurrence affecting the Protected Area. Specifically, visual sightings by station personnel that water levels are approaching storm drain system capacity. Countermeasures are being deployed and are currently operating satisfactorily. Both units continue to operate at full power. All safety systems remain available. The licensee has notified the NRC Resident Inspector, state, and other local authorities. Notified R2DO (Hopper), NRR EO (Lubinski) and IRD. Notified DHS SWO, DOE Ops Center, FEMA Ops Center, HHS Ops Center, NICC Watch Officer, and Nuclear SSA via email.
On January 10, 2014 at 0001 EST, St. Lucie Unit 1 terminated an Unusual Event. Site storm drain system functioning as required. Severe weather has passed, site water levels have returned to normal. Notified R2DO (Hopper), NRR EO (Lubinski) and IRD. Notified DHS SWO, DOE Ops Center, FEMA Ops Center, HHS Ops Center, NICC Watch Officer, and Nuclear SSA via email. |
| ENS 47987 | 2 June 2012 21:52:00 | At 1935 during normal full power operations, Unit 1 automatically tripped due to a loss of load caused by an instantaneous failure of the turbine control system. The trip was uncomplicated and all CEAs (control rods) fully inserted when the reactor was tripped. No automatic safety system actuations were required and none occurred. The cause and details of the turbine control system failure are under investigation. The plant is stable in Mode 3 at normal operating temperature and pressure. RCS Heat Removal is being maintained with Main Feedwater and Steam Bypass Control Systems with condenser vacuum. The offsite power grid is available and stable. This non-emergency notification is being made pursuant to 10 CFR 50.72(b)(2)(iv)(B) due to RPS actuation with the reactor critical. The licensee notified the NRC Resident Inspector. |
| ENS 47353 | 19 October 2011 07:32:00 | On October 19, 2011, at 0528, Unit 1 was manually tripped due to rising condenser backpressure. All (Control Element Assembly) CEAs fully inserted into the core. Decay Heat Removal is from Main Feedwater and Steam Bypass to the Main Condenser. The cause of the rising backpressure was an unplanned trip the Circulating Water Pump 1A1, which degraded the Circulating Water System performance. At the time of the trip, an additional Circulating Water Pump 1A2 was secured for planned maintenance. The cause of the Circulating Water Pump 1A1 trip is under investigation. This event is reportable pursuant to 10CFR 50.72(b)(2)(iv)(B) for the Reactor Trip. The plant is stable at normal operating temperature and pressure. The licensee notified the NRC Resident Inspector. |
| ENS 43863 | 21 December 2007 16:57:00 | With unit shut down in Mode 3 with all CEAs inserted preparing for startup, RCS Pressure Boundary leakage was identified. Leakage appears to be from a weld to Reactor Coolant Pump Seal Injection Line. Leakage is much less than one gallon per minute. Implementing Technical Specification LCO 3.4.6.2 Reactor Coolant System Operational Leakage Action (a) to place the unit in Cold Shutdown within the following 30 hours. Commencing plant cooldown for repair. The licensee notified the NRC Resident Inspector. |