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| Entered date | Event description | |
|---|---|---|
| ENS 53116 | 12 December 2017 17:52:00 | A South Texas Project (STP) Offsite Emergency Notification Siren (#7) was inadvertently going off. A resident who lived near the siren notified the Matagorda County Sheriff's Office at 0905 CST of the event and subsequently left a message with the STP Emergency Response staff. The Emergency Response staff dispatched maintenance to repair the siren and then later notified the Control Room at 1519 CST that the Sheriff's department was notified. The siren was inspected and reset. No issues were found with the siren. The Matagorda County Sheriff's Office was the only offsite agency that has been notified. The NRC Resident Inspector has been notified. |
| ENS 52716 | 29 April 2017 17:59:00 | A grass fire was reported to the Unit 1 control room at 1102 CDT. The grass fire was reported to be in the owner controlled area 1/2 mile west of the protected area and switchyard. The local fire department was dispatched to fight the grass fire. The fire was reported to be out at 1155 CDT. No plant equipment was damaged and the operation of the plant was not affected. Region 12 (Houston) of the Texas Commission of Environmental Quality (TCEQ) was notified of the event at 1623 CDT for visible emissions resulting from the grass fire. No further actions are required by the TCEQ at this time and no press release is planned. An insulator on a 345 kV line failed and the attached line separated and hit the ground. A spark was created when the 345 kV line hit the ground and started a fire that eventually grew to a 20 feet x 20 feet area. The licensee notified the NRC Resident Inspector. |
| ENS 52583 | 28 February 2017 21:48:00 | Event Report per 10 CFR 26.719(b)(1). On February 28, 2017, a violation of the site Fitness For Duty policy was committed. A prohibited item was found inside the Protected Area. The licensee notified the NRC Resident Inspector. |
| ENS 46298 | 1 October 2010 01:35:00 | At 1904 (CDT) on 9/30/2010, the South Texas Project (STP) North switchyard bus was lost due to a Transmission & Distribution Service Provider (TDSP) human performance error that occurred while performing maintenance on breaker Y-0530. This resulted in a loss of power to Standby transformer 1 which was supplying power to the Unit 1 B Train Engineered Safety Features (ESF) 4160v bus. The B Train Standby Diesel Generator automatically started due to the Loss of Offsite Power (LOOP) on its associated bus. The Mode II (LOOP) ESF loads sequenced onto the bus. All safety related equipment responded as expected. Action (e) of Technical Specification (TS) 3.8.1.1, 'AC Electrical Power Sources', was momentarily entered due to the loss of two independent offsite circuits while the North bus was de-energized. The North bus was de-energized for approximately 5 minutes. Action (a) of Technical specification (TS) 3.8.1.1, 'AC Electrical Power Sources', was entered due to the loss of one independent offsite circuit. All Technical Specification Limiting Condition of operation have been exited at this time. An 8-hour notification is required for this event due to the valid actuation of safety related equipment as described in 10CFR50.72 (b) (3) (iv) (A). (A notification is required for) any event or condition that results in valid actuation of any of the systems listed in paragraph (b) (3) (iv) (B) of this section, except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation. The NRC Resident Inspector has been notified. Unit 2 briefly entered a Technical Specification Limiting Condition of Operation, while all electrical buses remained energized. |
| ENS 46191 | 20 August 2010 17:47:00 | At 1525 (hrs. CDT) on 08/20/10, Unit 1 experienced an automatic reactor trip while the plant was stable at 100% power in Mode 1. All systems actuated as designed. The reactor trip was caused by an inadvertent turbine trip signal initiated during testing. All ESF (Engineered Safety Features) systems actuated as designed. The following systems actuated: Auxiliary Feed Water and Feed Water Isolation. All control and shutdown rods fully inserted. The plant is currently stable at normal operating pressure and temperature with decay heat being removed via steam dumps to the condenser. No primary or secondary relief valves lifted during the transient. The plant is in its normal shutdown electrical lineup with no problems noted. The trip was uncomplicated. The turbine trip signal was generated by a human performance error during reactor trip breaker testing. The licensee has notified the NRC Resident Inspector. |
| ENS 43086 | 10 January 2007 16:36:00 | On 01/10/2007 at 1235 CST, the Unit 1 control room was notified that the offsite fiber cable from Palacios to Port Lavaca was cut at approximately 1155 hours by a building contractor just out of Palacios on Texas Highway 35. Verizon dispatched a crew to repair. Estimated time for repair is about 4 hours. Offsite communications is lost from both Unit 1 and Unit 2 control rooms including the state and county ring down lines, the NRC ring down line and the ability to transfer information from the Emergency Response Data System (ERDS) to offsite agencies. Satellite phones remain available. At 1258 CST, the NRC Operations Center was notified via satellite communications of alternate phone numbers to contact the Unit 1 and Unit 2 Control Rooms. This is a follow-up to make the notification of this event to the NRC pursuant to 10 CFR 50.72 (b)(3)(xiii). The NRC Senior Resident Inspector was notified of this issue.
All offsite lines have been restored as of 1716 CST on 01/10/07. The licensee informed the NRC Resident Inspector. Notified R4DO (Spitzberg). |