Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 49712 | 10 January 2014 13:27:00 | On January 10, 2014, Florida Power and Light reported to the Florida Department of Environmental Protection that the St. Lucie Nuclear Plant temporarily bypassed the normal storm collection outfall path at 17:45 EST on January 9, 2014. The bypassed flow of water was a result of severe rainfall at the station and a blockage in the normal outfall path. This non-emergency notification is being made pursuant to 10CFR50.72(b)(2)(xi) due to the notification of the Florida Department of Environmental Protection. The licensee originally made the offsite notification to the State of Florida agency associated with the emergency declaration and severe weather event on January 9, 2014 (see Event Notification 49707). The licensee has notified the NRC Resident Inspector. |
| ENS 49536 | 14 November 2013 14:57:00 | On November 14, 2013 at 1218 EST, Unit 2 was manually tripped due to a lowering 2B Steam Generator level caused by the spurious closure of 2B Main Feedwater Isolation Valve HCV-09-2A. All CEAs (Control Element Assemblies) fully inserted into the core. All safety systems responded as expected with the 2B Train Auxiliary Feedwater Actuation System Channel 2 (AFAS 2) actuating on low 2B Steam Generator level. Decay Heat Removal is from Main Feedwater to the 2A Steam Generator and Auxiliary Feedwater to the 2B Steam Generator with Steam Bypass to the Main Condenser. This event is reportable pursuant to 10CFR 50.72(b)(2)(iv)(B) for the Reactor Trip and 10CFR 50.72(b)(3)(iv)(A) for the AFAS 2 actuation. The plant is in its normal shutdown electrical lineup. No safeties or relief valves lifted during this event. The NRC Resident Inspector has been notified by the licensee. |
| ENS 48818 | 12 March 2013 18:01:00 | On 3/12/13 at 1451 EDT, during normal full power operations, Unit 1 automatically tripped due to the Thermal Margin/ Low Pressure trip setpoint being exceeded. The trip was uncomplicated and all CEAs (control element assembly) fully inserted when the reactor was tripped. Main Steam Safety valves lifted momentarily post trip and reseated. No automatic safety system actuations were required and none occurred. The cause and details of the automatic trip 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 Atmospheric Dump Valves in operation. The operation of the Steam Bypass Control System is under review by Engineering. The Offsite power grid is available and stable. The licensee has notified the NRC Resident Inspector and there was no impact on Unit 2. |
| ENS 48369 | 3 October 2012 12:15:00 | On October 3, 2012, with Unit 2 in a defueled condition, a failure occurred on the 2B Startup Transformer, causing an undervoltage condition on an essential bus and resulted in the automatic start and loading of the 2B Emergency Diesel Generator (EDG). Prior to the event, the 2B EDG was available and not required by Technical Specifications; however, the 2B EDG was inoperable. Additionally, the 2A EDG is available. All equipment responded as expected. Currently maintaining the plant in a defueled condition. Decay heat removal is being supplied by the 2A Fuel Pool Cooling train and was never interrupted. There was no impact on the Shutdown Safety Assessment. This event is reportable pursuant to 10CFR50.72(b)(3)(iv)(A). Due to common high side feed, the loss of the 2B Startup Transformer resulted in the loss of the 1B Startup Transformer. Prior to the event, the 1A EDG was out of service for maintenance. As a result, Unit 1 entered Technical Specification 3.8.1.1 Action C. due to the loss of one offsite AC circuit and one diesel generator inoperable. The licensee has notified the NRC Resident Inspector. |
| ENS 45874 | 26 April 2010 11:51:00 | On April 25, 2010, at 1130 EDT, the Control Room Emergency Ventilation system on St. Lucie Unit 1 was declared out of service due to removing both Control Room Booster fans from service in order to support charcoal absorber replacement in the common filtration train as part of scheduled outage maintenance. The Technical Support Center (TSC) ventilation system is part of the Unit 1 Control Room Emergency Ventilation system, therefore, the TSC ventilation system has been rendered non-functional during the course of the work activities. The TSC ventilation is expected to be returned to service on 4/26/10. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures. Should the TSC become uninhabitable, the TSC staff will relocate to an alternate TSC location in accordance with applicable site procedures. This notification is being made in accordance with 10CFR 50.72 (b)(3)(xiii) due to the potential loss of an Emergency Response Facility (ERF). An update will be provided once the TSC ventilation system has been restored to normal operation. The NRC Resident Inspector has been notified. * * * UPDATE FROM FRED POLLACK TO DONG PARK AT 0321 EDT ON 5/1/2010 * * * Charcoal absorber replacement and post maintenance testing has been completed satisfactorily and the Control Room Emergency Ventilation System, and thus the Technical Support Center Ventilation System, has been declared back in service at 0140 on 05/01/2010. The NRC Resident Inspector has been notified. Notified R2DO (McCoy). |
| ENS 45817 | 7 April 2010 16:48:00 | A non-licensed contract employee had a confirmed positive for alcohol during a fitness-for-duty test. The contractor's access to the facility has been terminated. Contact the Headquarters Operations Officer for further details. The licensee notified the NRC Resident Inspector. |