Semantic search
| Entered date | Event description | |
|---|---|---|
| ENS 53908 | 3 March 2019 00:13:00 | On March 2, 2019 at 2237 EST, North Anna Unit 2 reactor was manually tripped, while operating at approximately 12 percent power, due to degrading vacuum in the main condenser. The unit was in the process of a planned shutdown for refueling when condenser vacuum degraded to greater than 3.5 inches of mercury absolute. The operations crew entered the reactor trip procedure and stabilized the unit in Mode 3 at normal operating pressure and temperature. All control rods fully inserted into the core following the reactor trip. The reactor protection system actuation is reportable per 10 CFR 50.72(b)(2)(iv)(B). There were no ESF system actuations. Decay heat is being removed by the Steam Generator Pressure Operated Relief valves. Unit 2 is in a normal shutdown electrical lineup. The NRC Resident Inspectors have been notified. The Louisa County Administrator will be notified. |
| ENS 53579 | 3 September 2018 15:20:00 | At 1045 (EDT) on 9/3/18, with Unit 1 and Unit 2 at 100% power, off-site power feed to the 'A' Reserve Station Transformer was lost which resulted in a loss of power to Unit 1'J' Emergency Bus. As a result of the power loss, the 1'J' Emergency Diesel Generator started as designed and restored power to the Emergency Bus. During this event, the Unit 1 'A' Charging Pump, 1-CH-P-1A automatically started as designed due to the loss of power event. The valid actuation of these ESF (Engineered Safety Features) components due to the loss of power is reportable per 10 CFR 50.72 (b)(3)(iv)(A). The Unit 1 'J' Emergency bus off-site power source was restored via the Unit 2 'B' Station Service bus and the 1 'J' Emergency Diesel was secured and returned to Automatic. The Unit 1 'A' Charging pump has been stopped and returned to Automatic. Both Units are in a stable condition. The apparent cause for the loss of power appears to be a bird strike to the 'A' RSST (Reserve Station Service Transformer) Overhead Cable. The licensee notified the NRC Resident Inspector. |
| ENS 49672 | 23 December 2013 13:00:00 | At 0828 EST on 12/23/2013, the North Anna control room was notified that the Virginia State Emergency Operations Center (EOC) had lost all power and all offsite communications. This included commercial phone lines, automatic ring downs, and the State ring down loop (lnsta-phone). At 0900 EST, all communications were restored once emergency generators were placed in service at Virginia State EOC. The Virginia State EOC initially lost offsite power only but all communications were supplied power by an Uninterruptable Power Supply (UPS). Subsequently, the UPS batteries depleted and all communications were lost. At that time (0828 EST) Virginia State EOC personnel notified the North Anna control room and supplied individual cellular phone numbers as an alternative method of contacting the Virginia State EOC. This report is reportable in accordance with 10CFR50.72(b)(3)(xiii), any event that results in a major loss of offsite communications capability, (e.g. Emergency Notification System). The licensee has notified the NRC Resident Inspector and Louisa County. |