Semantic search
| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 57201 | 30 June 2024 17:22:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification | The following information was provided by the licensee via phone and email: At 1222 CDT on 06/30/24, South Texas Project notified the Texas Commission on Environmental Quality (TCEQ) and the National Response Center regarding an oil spill of 280 gallons to the ground inside the protected area. This event was recorded as TECQ Event number: 20242394 and Incident Response Center incident number: 1403420. The spill occurred due to the overflow of an oily waste sump. The influent to the sump was stopped. The spill was confined to a 15 feet by 15 feet area on the ground and did not enter any waterway. This notification is being made solely as a four-hour, non-emergency notification for a notification to another government agency. This was determined to be reportable as required by 10CFR50.72(b)(2)(xi). There was no impact to the health and safety of the public or plant personnel. The NRC resident inspector has been notified. | ||
| ENS 56439 | 30 March 2023 06:03:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to ON-SITE Fatality | The following information was provided by the licensee via email: At approximately 0037 CDT on March 30, 2023, a non-responsive individual at South Texas Project (STP) Electric Generating Station was transported offsite for treatment at an offsite medical facility. The offsite medical facility notified STP Nuclear Operating Company that the individual had been declared deceased as of 0103 CDT. The fatality was not work-related, and the individual was outside of the radiologically controlled area. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi) as a four-hour, non-emergency notification for an on-site fatality and notification of another government agency. OSHA will be notified. The NRC Resident Inspector has been notified. | ||
| ENS 55918 | 25 May 2022 18:54:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification for Inadvertent Discharge of Halon | The following information was provided by the licensee via email: On 5/25/2022 at 1354 (CDT), during the replacement of two detectors, a halon actuation occurred which resulted in an unintentional release of approximately 384 pounds of halon gas into an enclosed room in the Unit 1 Electrical Auxiliary Building. There was no impact to plant operations or plant personnel. The room was verified by station Safety Personnel to be safe for normal access. On 5/27/2022 at 2038 (CDT), Region 12 (Houston) of the Texas Commission of Environmental Quality (TCEQ) was notified of an event which met the requirements of "Emission Event" for the TCEQ of a halon release that exceeded the reportable quantity threshold of 100 pounds in a 24 hour period. The halon discharge was contained within the site protected area. Therefore, this event is not significant with respect to the health and safety of the public. The licensee has notified the NRC Resident Inspector. | ||
| ENS 55053 | 30 December 2020 21:50:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Inadvertent Emergency Siren Activation | On December 30, 2020 at 1550 CST, South Texas Project (STP) received a report that two Emergency Notification System sirens inadvertently actuated. The sirens were heard by residents in the area who contacted the Matagorda County Sheriff's office, which notified the Emergency Response Division at STP of the siren actuation at 1557 CST. Both sirens were initially restored, however siren #24 subsequently actuated again at 1735 CST. Siren #24 has been disconnected. Siren #27 remains available. Thirty-one of thirty-two sirens are available. This notification is being made under 10CFR50.72(b)(2)(xi) as an event where other government agencies were notified. The sirens are no longer alarming. A social media release is planned. The NRC Resident Inspector has been notified of the event. The licensee believes the sirens actuated due to significant rain in the area but will be investigating the cause of the inadvertent actuation. | ||
| ENS 54714 | 14 May 2020 21:10:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification for Hydraulic Oil Release | At 1535 CDT, on 5/14/2020, it was determined that approximately 10 gallons of hydraulic oil was spilled during dredging activities into the STP Intake Basin (adjacent to the Colorado River). Cleanup using oil booms is underway and there is no longer a visible sheen. The cause of the hydraulic oil spill is under investigation. The Texas General Land Office was notified at 1610 CDT. The NRC Resident Inspector has been notified. | ||
| ENS 54587 | 17 March 2020 20:58:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Notification to Other Government Agency | At 1532 CDT, on 3/17/2020, it was reported to the Unit 1 Control Room that less than one gallon of hydraulic oil was spilled into the Colorado River during dredging activities. Cleanup using oil booms was completed at 1747 CDT. The cause of the hydraulic oil spill is under investigation. The Texas General Land Office was notified at 1558 CDT. The NRC Resident Inspector has been notified. | ||
| ENS 54561 | 4 March 2020 13:18:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | EN Revision Imported Date : 3/6/2020 NOTIFICATION TO OTHER GOVERNMENT AGENCY On March 4, 2020, an actual Unusual Event code was inadvertently sent to an offsite agency, Institute of Nuclear Power Operations (INPO), and to a former NRC Resident Inspector during a planned emergency response drill. The NRC Resident Inspector has been notified.
Based on further review of the NRC reporting guidance relative to these criteria, STP has concluded that this condition is below the reporting threshold outlined in NUREG-1022 Revision 3. NUREG-1022 states the following (page 54): 'Licensees generally do not have to report media and government interactions unless they are related to the radiological health and safety of the public or on-site personnel, or protection of the environment. The condition originally reported in EN 54561 is not a news release or government notification and has no impact on the radiological health and safety of the public or on-site personnel, or protection of the environment. Therefore, STP is retracting EN 54561. The NRC Resident Inspector was notified on 3/5/2020 at 1310 CST. Notified R4DO Rick Deese. | |||
| ENS 54529 | 17 February 2020 23:17:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Notification to Other Government Agency | At 1647 CST on 2/17/2020, it was determined that approximately two quarts of hydraulic oil were spilled into the Colorado River during preparation for dredging activities. Cleanup using an oil dispersant and oil booms is underway. The cause of the hydraulic oil spill is under investigation. The Texas General Land Office was notified at 1717 CST. Additional reports were made to the Texas Commission of Environmental Quality, the Environmental Protection Agency National Response Center, and the Matagorda County Local Emergency Planning Committee. The NRC Resident Inspector has been notified. | ||
| ENS 54284 | 18 September 2019 12:50:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Communication with Emergency Operations Facility | At 0750 CDT, on September 18, 2019, South Texas Project Electric Generating Station (STPEGS) experienced an unplanned loss of the Integrated Computer System (ICS) to the Emergency Operations Facility (EOF). The loss of ICS resulted in a major loss of emergency assessment capability to the STPEGS EOF for greater than 90 minutes. Assessment capability has been verified to be available in the Unit 2 Technical Support Center (TSC) and the Unit 1 and Unit 2 Control Rooms. ICS was restored to the EOF at 0932 CDT on September 18, 2019. This report is being made pursuant to 10 CFR 50.72(b)(3)(xiii) as any event that resulted in a major loss of emergency assessment capability, offsite response capability, or offsite communications capability. There was no impact to the health and safety of the public or plant personnel. The NRC Resident Inspector has been informed. | ||
| ENS 54145 | 3 July 2019 15:26:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Offsite Notification Due to Radio Transmitter Out of Service | At 1026 CDT on July 3, 2019, the National Weather Service notified the South Texas Project (STP) that the Bay City NOAA radio transmitter was out of service. This affects the tone alert radios used to notify the public in the event of an emergency condition. This condition impacts the ability to readily notify a portion of the Emergency Planning Zone (EPZ) population for the STP Electric Generating Station. The loss of the alert radio system meets the reporting criterion for 10 CFR 50.72(b)(3)(xiii). The Matagorda County alert sirens, which are also part of the Public Prompt Notification System, remain operable. Compensatory measures have been verified to be available should the Prompt Notification System be needed. These measures consist of a reverse 911 system available from Matagorda County as well as local law enforcement personnel who would perform route alerting for the affected areas of the EPZ. The event has been entered into the Corrective Action Program and the NRC Resident Inspector has been notified. A return to service time for the radio transmitter is not currently available. Matagorda County was also notified by the National Weather Service and STP. This meets the reporting requirement for notification of an offsite agency, 10 CFR 50.72(b)(2)(xi).
At 1321 CDT, the National Weather Service communication tower was returned to service. South Texas Project verified that the automatic notification radios have been returned to service. The licensee has notified the NRC Resident Inspector. Notified R4DO (Haire). | ||
| ENS 54097 | 1 June 2019 21:18:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Gasoline Leakage to Site Drainage System | On June 1,2019, at 1618 (CDT), a notification under 10 CFR 50.72(b)(2) is being made due to notification to offsite agencies as a result of gasoline leakage to the site drainage system in the owner controlled area at South Texas Project. During a routine tour, the facilities department notified the site environmental group about a gasoline leak on fuel tank sight glass at the fuel island on site. The site environmental (group) has determined the leak amount requires notification to the Texas Commission of Environmental Quality and the Environmental Protection Agency National Response Center. The Texas Commission of Environmental Quality was notified at 1618 on June 1, 2019, and the Environmental Protection Agency National Response Center at 1626 on June 1, 2019. The NRC Resident Inspector has been notified. The licensee stated that approximately 1,384 gallons of gasoline leaked over a period of time. The spill is located at an equipment warehouse area at a distance from the plant. The leak has been isolated and the cleanup is expected to be completed by tomorrow. | ||
| ENS 53656 | 9 October 2018 05:00:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unplanned Loss of Emergency Response Equipment | At 2115 CST on October 9, 2018, South Texas Project Electric Generating Station (STPEGS) experienced an unplanned loss of the Integrated Computer System (ICS) to the Emergency Operations Facility (EOF). The loss of ICS resulted in a major loss of emergency assessment capability to the STPEGS Emergency Operations Facility (EOF) for greater than 75 minutes. Assessment capability has been verified to be available in the Unit 1 and Unit 2 Technical Support Centers (TSC) and the Unit 1 and Unit 2 Control Rooms. This report is being made pursuant to 10 CFR 50.72(b)(3)(xiii), any event that results in a major loss of emergency assessment capability, off site response capability, or off site communications ability. The NRC Resident Inspector has been informed. The cause of the unplanned loss is currently being investigated and compensatory measures are in place.
Integrated Computer System was returned to service as of 0810 CDT on October 10, 2018. Notified R4DO (Gepford) and CAT via email. | ||
| ENS 53405 | 17 May 2018 03:02:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification of Fires in the Owner Controlled Area | On May 16, 2018 at approximately 1425 CDT, two grass fires started in the Owner Controlled Area surrounding South Texas Project (STP) Nuclear Generating Station. The Bay City Volunteer Fire Department was called to the site to fight the fire. Reinforcements from Tres Palacios Oaks, Midfield and Markham Fire Departments were called in to assist with firefighting efforts. The grass fires were extinguished on May 16, 2018 at 2046 CDT. The fires occurred outside the protected area of the plant and presented no danger to the public or the safe operation of the units. On May 16, 2018 at 2202 CDT, STP Nuclear Generating Station issued a press release to inform area residents. The licensee notified the NRC Resident Inspector.
On May 17, 2018, at 11:10 CDT STP Nuclear Generating Station notified the Texas Commission on Environmental Quality (TCEQ) of the grass fires, resulting in visible emissions, that occurred in the Owner Controlled Area of the STP Nuclear Generating Station on May 16, 2018, between the times of 14:25 and 20:46 CDT. No further press releases are planned. The licensee notified the NRC Resident Inspector. Notified R4DO (Gepford). | ||
| ENS 53141 | 1 January 2018 16:15:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification - Emergency Notification Siren Inadvertent Actuation | A South Texas Project Offsite Emergency Notification siren (#7) was inadvertently going off. The Matagorda County Sheriff's office notified the Emergency Response Organization at the station of the siren actuation. Station personnel are addressing the issue with the siren. The Matagorda County Sheriff's office was the only offsite agency that was contacted during this event. This notification is being made under 10CFR50.72(b)(2)(xi) as an event where other government agencies were notified. The licensee has personnel at the siren which is no longer alarming (1.5 hours after alarm notification). The licensee notified the NRC Resident Inspector | ||
| ENS 53118 | 12 December 2017 23:57:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Unplanned Loss of Emergency Response Equipment | At 1757 CST on December 12, 2017, South Texas Project Electric Generating Station (STPEGS) Unit 1 and Unit 2 experienced an unplanned partial loss of the Integrated Computer System (ICS). The partial loss of Unit 1 and Unit 2 ICS resulted in a major loss of emergency assessment capability to STPEGS Unit 1 and Unit 2 Technical Support Center (TSC) for greater than 75 minutes. Assessment capability has been verified to be available in the Emergency Operations Facility (EOF). This report is being made pursuant to 10 CFR 50.72(b)(3)(xiii), any event that results in a major loss of emergency assessment capability, off site response capability, or off site communications ability. The NRC Resident Inspector has been informed. | ||
| ENS 53116 | 12 December 2017 21:19:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Inadvertent Actuation of Emergency Notification Siren | 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 52911 | 17 August 2017 19:42:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Non Work Related Onsite Fatality | At 1315 Central Daylight Time (CDT) on 8/17/2017, the South Texas Project Unit 1 Control Room was notified that a contract employee had experienced a non-work-related medical emergency within the Protected Area. The individual was transported to Matagorda Regional Medical Center in Bay City, TX. At 1442 CDT, the Unit 1 Control Room was notified that the patient was declared deceased. The Occupational Safety and Health Administration (OSHA) will be notified. This notification is being made under 10CFR50.72(b)(2)(xi) as an event for which another government agency is being notified. The deceased individual was not radioactively contaminated. The NRC Senior Resident Inspector has been notified. | ||
| ENS 52775 | 30 May 2017 14:29:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Emergency Operations Facility Integrated Computer System Data for Planned Maintenance | On May 30, 2017 at 0929 (CDT), South Texas Project (STP) removed from service Integrated Computer System (ICS) connections to the Emergency Operations Facility (EOF) for planned maintenance. The ICS computers are used in the EOF to directly monitor selected plant parameters and to provide Emergency Response assessment capabilities. This planned maintenance implements a software modification and is expected to last for four days. This is reportable under 10 CFR 50.72(b)(3)(xiii) because the EOF assessment capabilities would not be able to be restored within the facility activation time and assessment capabilities cannot be performed at a backup facility (i.e., there is no backup EOF). While ICS connections in the EOF are out of service, if the Emergency Plan is entered and the Technical Support Center (TSC) and EOF are staffed, the EOF will not activate and Emergency Director authority will remain in the TSC. The Emergency Response Organization team members that report to the EOF and TSC have been notified regarding the status of the ICS computers in the EOF. The planned modification that impacts the ICS computers in the EOF does not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified. The licensee notified the Matagorda County Sheriff, and the State of Texas Department of Public Safety and the Department of State Health Services. | ||
| ENS 52733 | 5 May 2017 02:03:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Miscommunication During On-The-Job Training | On 5/4/17 at 2103 CDT, the South Texas Project (STP) Security Department was conducting on-the-job training for Bomb Threat response. While simulating the Bomb Threat Checklist via phone call, the trainer mistakenly contacted the Brazoria County, TX Child Protective Services (CPS) and reported a bomb threat. In response, the Child Protective Services notified the City of Brazoria, TX Police Department of the threat. The Brazoria Police Dept. then contacted both the Bay City, TX Police Department and the STP Security Department. By approximately 2130 CDT, all agencies had been notified by the STP Security Department of the mistaken phone call and that no actual bomb threat existed. The NRC Senior Resident Inspector was notified of the issue. | ||
| ENS 52716 | 29 April 2017 21:23:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Small Grass Fire in Owner Controlled Area | 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 52142 | 1 August 2016 20:18:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Unintentional Release of Halon | At 1118 (CDT) during planned maintenance activities there was an unintentional release of approximately 146.5 pounds of Halon gas into an enclosed room in the Unit-2 Electrical Auxiliary Building. There was no impact to plant operations or plant personnel. The room was verified by station Safety Personnel to be safe for normal access. At 1518, Region 12 (Houston) of the Texas Commission of Environmental Quality (TCEQ) was notified of an event which met the requirements of 'Emission Event' for the TCEQ of a HALON release that exceeded the reportable quantity threshold of 100 pounds in a 24 hour period. No further actions are required by the TCEQ at this time and no press release is planned. The halon discharge was contained within the site protected area. Therefore, this event is not significant with respect to the health and safety of the public. The licensee has notified the NRC Resident Inspector. | ||
| ENS 52106 | 13 July 2016 16:00:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Exercise Press Releases Aired on Radio as an Actual Event | During the planned NRC/FEMA evaluated drill exercise on 7/13/16, two press releases written in the Joint Information Center (JIC) were published in the Public Information and Emergency Response (PIER) system without 'THIS IS A DRILL' denoted at the top of the page. The original press release was stamped with 'THIS IS A DRILL' at the top of page 1 and at the bottom of page 2. When it was added into the PIER system for publication/faxing, it was not noticed the top of the document denoting 'THIS IS A DRILL' was cut off. The local radio station affiliate was not aware of STP's (South Texas Project's) exercise on 7/13/16. As a result, the affiliate station thought it was a real event and read the press releases over the airwaves at 1014 (CDT) and again at 1046 (CDT). At approximately 1400 (CDT) on the same day, the radio station told their listening audience of the mistake and stated STP was having a training exercise not a real event. The correction was broadcast over the airwaves three times every hour until midnight. This unplanned media event is being reported in accordance with 10CFR50.72(b)(2)(xi). This event is not significant with respect to the health and safety of the public. The licensee notified the NRC Resident Inspector. | ||
| ENS 51964 | 28 May 2016 01:46:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to an Inadvertent Actuation of One Emergency Siren | A South Texas Project offsite emergency notification siren was inadvertently going off. The Matagorda County Sheriff's Office notified Site Security that a siren had actuated. At the time of the inadvertent siren actuation the area was experiencing lightning and rain. Suspect lightning caused the inadvertent siren actuation. Station Personnel are addressing the issue with the siren. The Matagorda County Sheriff's Office was the only offsite agency that was contacted during the event. The licensee has notified the NRC Resident Inspector. | ||
| ENS 51787 | 14 March 2016 07:47:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Inadvertent Actuation of Offsite Emergency Notification Siren | A South Texas Project, Offsite Emergency Notification Siren, was inadvertently going off. The Matagorda County Sheriff's Office notified Site Security that a siren had actuated for no apparent reason. Station personnel are addressing the issue with the siren. The Matagorda County Sheriff's Office was the only offsite agency that was contacted during the event. The siren was tested and is considered functional at this time. Additional testing will be completed during daylight hours. The licensee will notify the NRC Resident Inspector. | ||
| ENS 51536 | 13 November 2015 12:39:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Notification of Unusual Event Due to Unidentified Rcs Leakage Greater than 10 Gpm | While in Mode 3, South Texas Project Unit 1 declared an Unusual Event at 0639 CST on 11/13/15, due to SU7 of EAL1- Unidentified RCS or Pressure Boundary leakage greater than 10 gpm. The excessive leakage to the WHT (waste holding tank) occurred when a letdown system demineralizer was placed in service. Operators bypassed the demineralizer and the RCS leakage was stopped. The excess leakage lasted for approximately 8 minutes and the maximum leakage was estimated to be 12-15 gpm. There was no impact on South Texas Unit 2 which continues to operate at 100% power. South Texas Project Unit 1 exited the Unusual Event at 0802 CST on 11/13/15, after verifying Unidentified RCS leakage less than 1 gpm. The demineralizer drain valve was partially open and was the cause of the excess leakage. The drain valve has been closed. The licensee has notified the NRC Resident Inspectors. Notified DHS SWO, FEMA Ops Center, FEMA NWC, NICC Watch Officer, and NuclearSSA via email
Due to entering the STP (South Texas Project) Emergency Plan (Unusual Event), STP has officially determined to make a planned press release. Per 10 CFR 50.72(b)(2)(xi), STP is making a notification to the NRC via the emergency notification system (ENS). The NRC Resident Inspector has been notified of the press release. The planned press release shares the following information: On November 13, 2015, STP Nuclear Operating Station, Unit 1, declared an Unusual Event at 0639 CST. Plant operators identified increasing reactor coolant system leakage in Unit 1. Plant Operators took immediate actions to verify the source and safely isolate and stop the leakage. Upon identifying the source of the leakage, the Unusual Event was exited at 0802 CST on November 13, 2015. The leakage was captured and maintained within an on-site storage tank and there was no radioactive release to the environment. STP Unit 1 is preparing for restart following a scheduled refueling and maintenance outage. Notified the R4DO (Gaddy).
The purpose of this report is to retract the ENS report made in accordance with 10 CFR 50.72 (a)(1)(i) on November 13, 2015, at 08:21 EST (ENS # 51536). STP Nuclear Operating Company declared an Unusual Event at 0639 CDT on November 13, 2015, based on Initiating Condition for Reactor Coolant System (RCS) Leakage Emergency Action Level (EAL) SU7. The event was reported to the NRC under EN # 51536 and the event was subsequently terminated on November 13, 2015 at 0802 CST. After further review, the emergency declaration is being retracted because the source of the leakage was from the Chemical and Volume Control System (CVCS) and not from the RCS. The NRC Resident Inspector will be notified. Notified the R4DO (Hagar). | Reactor Coolant System | |
| ENS 51339 | 23 August 2015 18:00:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Grass Fire in Owner Controlled Area | A fire was reported to the unit 2 control room at 1300 central time (CDT). The fire was reported to be in the owner controlled area 3/4 of a mile west of the protected area and switchyard. The local fire department was dispatched to fight the fire. The fire burned approximately 1.5 acres. The fire was reported to be out at 1417 central time. 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 1509 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. The fire was caused by a downed 12.5 kV power line which powers outlying plant areas. The licensee notified the NRC Resident Inspector. | ||
| ENS 51115 | 1 June 2015 15:26:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Unit 2 Ventilation Radiation Monitor Operability | On June 2, 2015 at 2027 CDT, it was discovered that the unit vent radiation monitor was inoperable beginning on June 1, 2015 at 1026 CDT. Compensatory measures were not taken in accordance with the Offsite Dose Calculation Manual (ODCM) during this time period and the radiation monitor was unable to be used to assess Emergency Action Levels in accordance with the Emergency Plan. On June 3, 2015 it was recognized that because no compensatory measures were implemented during the period of inoperability that the condition resulted in a major loss of emergency assessment capability which is reportable under 10CFR50.72(b)(3)(xiii). Compensatory measures were implemented per the ODCM upon discovery on June 2 at 2027, thus there is currently no major loss of emergency assessment capability. This event did not result in any challenges to the fission product barriers and it did not adversely affect the safe operation of the plant or the health and safety of the public. The NRC Resident Inspector will be notified. | ||
| ENS 51073 | 15 May 2015 22:53:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Inadvertent Siren Actuation | A South Texas Project Offsite Emergency Notification siren was (inadvertently) going off. The Matagorda County Sheriff's office notified the Emergency Response organization at the station that a siren had actuated during a severe thunderstorm moving through the area. Station personnel are addressing the issue with the siren. The Matagorda County Sheriffs office was the only offsite agency that was contacted during this event. The licensee notified the NRC Resident Inspector. | ||
| ENS 50716 | 5 January 2015 23:45:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Death of Employee | At approximately 1545 CST on 1/5/15, an employee was found unconscious by fellow teammates. His teammates, who are certified in cardiopulmonary resuscitation (CPR), commenced resuscitation until Matagorda County EMS arrived on the scene and transported the individual to Matagorda County Regional Hospital for medical treatment. The individual was evaluated by the Emergency Room Physician and was later pronounced deceased due to Cardiopulmonary Arrest. STP is investigating the incident. STP has reported this to the Occupational Safety and Health Administration (OSHA) and as such is reporting this in accordance with 10 CFR 50.72 (b)(2)(xi). A press release is not planned at this time. The NRC Resident Inspector was notified. | ||
| ENS 48448 | 27 October 2012 19:15:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Offsite Communications | On 10/27/2012 at 1415 CDT, the control room was notified of a loss of telephone communications. Reason is unknown at this time. Offsite communications lost includes the state and county ring down lines, the NRC ring down line. The ability to transfer information from the Emergency Response Data System (ERDS) to offsite agencies is believed not to be available. Satellite phones remain available. At approximately 1500 CDT, the NRC Operations Center was notified via satellite communications of alternate phone numbers to contact the Unit 1 Control Room and that Unit 2 Control Room satellite phone is not available to receive calls. This is a follow up to make the notification of this event to the NRC pursuant 10 CFR 50.72(b)(3)(xiii). The NRC Senior Resident Inspector was notified of the issue." State and local agencies were notified via alternate means.
Emergency Notification System has been returned to service. The cause of the loss of communications was a cut fiber optic line. Notified R4DO (Hagar). | Emergency Response Data System | |
| ENS 47362 | 20 October 2011 21:50:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to the Offsite Fatality of an Employee | On October 20, 2011 at approximately 1335 hours, a South Texas Project employee suffered an apparent heart attack offsite while attending a fire brigade training exercise. The person was transported to Matagorda County Regional hospital. The individual was evaluated by emergency room personnel and later pronounced deceased. OSHA is being notified pursuant to the requirements of 29CFR1904.39. This ENS report is being made in accordance with 50.72(b)(2)(xi). There was no radioactive contamination involved in this event. The licensee does not plan any media or press release. The NRC Resident Inspector has been notified. | ||
| ENS 46588 | 2 February 2011 14:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Partial Loss of Prompt Notification System (Pns) Emergency Sirens Due to a Loss of Power | At approximately 0830 (CST) on 2/2/2011, eleven (11) of thirty-two (32) STP Prompt Notification System (PNS) sirens were not operable due to loss of power. The sirens were subsequently polled at approximately 0909 (CST) and all sirens except 3 were operable. The loss of power was caused by rolling outages due to unusually severe cold weather. ERCOT issued an order requiring load shedding to maintain a steady state system frequency of 59.8 Hertz (Hz) on the grid. The outages were suspended at 1400 hrs but rolling outages could continue through the end of the week potentially affecting the sirens. All 32 sirens were likely affected during the outages for some un-quantified period of time. Continuous polling of the sirens was not performed or advisable since polling depletes the batteries which could affect the operability of the sirens. STPNOC (South Texas Project Nuclear Operating Company) has notified Matagorda County Sheriff Department. Compensatory measures have been verified to be available should the Prompt Notification System be needed. This consists of using Local Law Enforcement Personnel for 'Route Alerting' of the affected areas of the Emergency Planning Zone (EPZ). Matagorda County Emergency Management has verified that the Matagorda County Sheriffs Department is on standby for Route Alerting. STPNOC is currently transitioning to new sirens. While the new sirens are not currently credited in the STP Emergency Plan, we have received final FEMA approval. All of the new battery-backed sirens were tested and verified to remain operable and capable of notifying the population in the EPZ. This notification is being made under 10 CFR 50.72(b)(3)(xiii) due to a significant loss of the offsite Prompt Notification System. It is possible that rolling outages may recommence in the next several days. The licensee informed the NRC Resident Inspector and the offsite agencies identified above. | ||
| ENS 46387 | 3 November 2010 15:21:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation 10 CFR 50.72(a)(1)(i), Emergency Class Declaration 10 CFR 50.72(b)(3)(iv)(A), System Actuation | Unusual Event Declared Due to an Explosion in the Protected Area Which Affects Normal Operations | On November 3, 2010 at 1021 CDT, operators attempted to start the Unit 2 startup feedpump to support a two hour maintenance run. The feeder breaker for the startup feedpump exploded causing an undervoltage condition on Auxiliary Bus 1H and Standby Bus 1H which resulted in an automatic reactor trip due to reactor coolant pump undervoltage. All control rods inserted into the core. At 1038 CDT, the site declared an UNUSUAL EVENT (HU-2) due to an explosion in the protected area which affects normal plant operations. The standby diesel generator (EDG-23) started and loaded to the 'C' train loads which sequenced properly. The auxiliary feedwater system automatically started as expected providing feedwater to the steam generators. The normal feedwater pumps were secured. Decay heat is being removed from Unit 2 using the normal steam dump valves to the main condenser. There is no primary to secondary leakage. The plant is stable and in MODE 3 with no challenges to reactor safety. There was no impact on Unit 1. At 1240 CDT the licensee terminated the UNUSUAL EVENT. The licensee is investigating the cause of the breaker explosion and if the other standby diesel generator (EDG-21) should have started due to the undervoltage condition. The licensee notified the NRC Resident Inspector.
A News Release is being planned so this condition is also being reported pursuant to 10 CFR 50.72(b)(2)(xi). During the electrical fault condition, some Train A components stopped running although no Train A low voltage ESF actuation occurred, The reason for this occurrence is not fully understood, The breaker malfunction did not result in a fire. The licensee will notify the NRC Resident Inspector. Notified: R4DO (Spitzberg); NRR (Thorp); R4RA (Collins); NRR (Boger); IRD (Gott) DHS (Hill); FEMA (Hollis)
The licensee called to correct an editorial error in the original report above. The second sentence of the original report above should refer to Auxiliary Bus 2H and Standby Bus 2H since this is a Unit 2 issue. Notified: R4DO (Spitzberg). | Steam Generator Feedwater Auxiliary Feedwater Main Condenser Control Rod | |
| ENS 45262 | 13 August 2009 20:41:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to a Grass Fire in the Owner Controlled Area | A fire was reported to the unit-2 control room at 1541 Central time (CDT). The fire was reported in the Owner Controlled Area. Local (Bay City) fire department was dispatched to fight the fire. The fire occupied approximately 2 acres. The fire was reported to be under control at 1635 (CDT). No plant equipment was damaged nor was the operations of the unit affected. Region 12 of the Texas Commission of Environmental Quality was notified at 1721 (CDT) and no further actions were required by the Agency (Texas Department of Environmental Quality). The licensee notified the NRC Resident Inspector. | ||
| ENS 43612 | 1 September 2007 21:58:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Related to Fatality | The purpose of this report is to notify the NRC of a fatality involving a contract worker at the South Texas Project. Specifically, at 15:35 (CST), the South Texas Project Unit 1 Control Room was notified that an individual located outside of the protected area but in the owner controlled area had loss consciousness. The site emergency medical team responded and an ambulance was requested at 15:39. At 16:58 the South Texas project was notified that the individual was pronounced dead upon arrival at Matagorda General Hospital. The South Texas Project will be notifying OSHA of the fatality. A press release is not planned at this time, but is under consideration. The resident NRC inspector has been notified | ||
| ENS 43595 | 25 August 2007 12:30:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Erds System and Portions of Plant Computer Out of Service for Planned Maintenance Outage | The licensee will perform a planned power outage on Unit 1 which will take the ERDS system, 25% of the control room annunciators, and portions of the plant computer out of service. Some points on the plant computer will not be able to be monitored during the outage. However, the licensee has compensatory measures in place to monitor those parameters on the control boards. The outage is scheduled from 0730 CDT until 1800 CDT. The licensee will enter Technical Specification LCO 3.1.3.1 and 3.1.3.2. The licensee notified the NRC Resident Inspector.
The licensee restored ERDS to service at 1805 CDT on 8/25/07 and will inform the NRC Resident Inspector. Notified R4DO (Jeff Clark). | ||
| ENS 43086 | 10 January 2007 18:35:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Loss of Offsite Landline Communications Capability Due to Cut Fiber Optic Cable | 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). | Emergency Response Data System | |
| ENS 42757 | 8 August 2006 20:43:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Inadvertent Emergency Notification Siren Activation | At approximately 15:43 (CDT) on 8/8/2006, all STP Emergency Notification System (ENS) sirens inadvertently/spuriously activated. The sirens automatically secured after approximately 3 minutes. All sirens except one at El Maton have subsequently been polled operable. STPNOC is investigating the cause of the activation. STPNOC has notified Matagorda County Sheriff Department and radio station KZRC. Inquiries from the public have been received. This notification is being made under 10CFR50.72(b)(2)(xi) as an event where other government agencies were notified. The licensee notified the NRC Resident Inspector. | ||
| ENS 42579 | 16 May 2006 14:45:00 | 10 CFR 50.72(b)(3)(xiii), Loss of Emergency Preparedness | Disruption of Incoming and Outgoing Telephone Communciation Capability | On 05/16/2006 at 0945 CDT, the control room was notified that problems with Bell South and Verizon phone services had occurred which disrupted incoming and outgoing telephone communications capability for both Unit 1 and Unit 2. Subsequent attempts from the control room confirmed that the State and County ringdown line was dead as well as the Emergency Notification System line. It was also determined that although outgoing calls from the control room and Emergency Operations Facility via land line were possible, incoming calls could not be received. The NRC Operations Center was contacted via land line at 09:50 CDT to inform the NRC of the issue. Alternate communication via cell phone and satellite phone was established to allow incoming calls from the NRC, State and County. The NRC Senior Resident Inspector was notified of the issue. Telephone service was restored at 13:50 CDT which re-established all normal and emergency telephone communications capability. | ||
| ENS 42322 | 8 February 2006 22:30:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification | Notification is being made that the South Texas Project is notifying the State of Texas Department of State Health Services not to use the Delta Temperature method (primary method) (used to determine atmosphere stability input to offsite dose assessment calculations) for dose assessment. South Texas Project will be using the Backup method until the Delta Temperature problems are resolved. The licensee notified the NRC Resident Inspector. | ||
| ENS 41505 | 19 March 2005 14:27:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Injured Contract Employee | The following information was obtained from the licensee via facsimile (licensee text in quotes): South Texas Project Nuclear Operating Company has been in contact with various news agencies following an industrial accident that occurred at 0827 this morning. A contract employee fell approximately eight to ten feet while descending a permanent plant ladder on a structure in the secondary plant. The individual sustained injuries to his head and back, and has been transported to Herman Hospital in Houston, TX by a Life Flight Helicopter. The NRC Regional Office has been informed. The individual was conscious and in stable condition when he left the facility. The licensee notified the NRC Resident Inspector. | ||
| ENS 41394 | 10 February 2005 02:20:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Press Release for Plant Shutdown | The following information was obtained from the licensee via facsimile: STP (South Texas Project) Nuclear Operating Co. will be making a press release concerning the shut down of Unit 2. STPNOC will be sharing the press release with various locals and state government agencies and the media. NRC was notified of the TS (Technical Specification) required shutdown on 2/9/05 (EN# 41392) The licensee has notified the NRC Resident Inspector.
STP Nuclear Operating Company (STPNOC) issued a press release at 1503 today concerning the status of the shutdown of Unit 2. STPNOC has shared the press release with various local and state government agencies and the media. NRC was notified of the Technical Specification required shutdown on 2/9/05 (Reference EN# 41392). The licensee informed the NRC Resident Inspector. Notified R4DO (Blair Spitzberg). | ||
| ENS 40657 | 8 April 2004 14:44:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification of a Fatality | The purpose of this report is to notify the NRC of a fatality involving a contract worker at the South Texas Project. Specifically, at 0810 (CDT), the South Texas Project Unit 1 Control Room was notified that an individual located outside of Unit 2 in a non-radiological area had lost consciousness. The site emergency medical team responded and an ambulance was requested at 0812. At 0836, the worker left the site in an ambulance. At 0944, South Texas Project was notified that the individual passed away at Matagorda General Hospital. This fatality was the result of a medical emergency and was not occupationally related. South Texas Project has notified OSHA of the fatality. A press release is not planned. The individual was a contractor working in a temporary tool storage area outside Unit 2. The Licensee notified the NRC Resident Inspector. |