Semantic search
| Start date | Reporting criterion | Title | Event description | System | LER | |
|---|---|---|---|---|---|---|
| ENS 56850 | 12 November 2023 08:00:00 | 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 email: On November 12, 2023, at 0300 EST, a Watts Bar contractor was transported offsite for medical treatment due to a work-related injury. Upon arrival at an offsite medical facility, medical personnel determined the injury required the individual to be admitted into the hospital and will be kept overnight. The individual was inside of the Radiological Controlled Area, however was free released with no contamination. The injury and hospitalization were reported to the Occupational Safety and Health Administration (OSHA) under 29 CFR 1904.39(a)(2). The contracting agency informed OSHA at 1319 EST. Watt Bar Operations personnel were officially notified by the contracting agency of the report made to OSHA at 1945 EST. This is a four-hour notification, non-emergency for a notification of other government agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). The NRC Resident Inspector has been notified. | ||
| ENS 55590 | 18 November 2021 04:10:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Non-Work Related On-Site Fatality | At 2238 Eastern Standard Time (EST), on 11/17/2021, a Watts Bar Nuclear Plant contractor was transported offsite for treatment at an offsite medical facility. The offsite medical facility notified Watts Barr Nuclear Plant at 2310 EST that the individual had been declared deceased. The fatality was not work-related and the individual was inside of the Unit 1 Radiological Controlled Area. The individual was confirmed not to be contaminated. This is a four-hour notification, non-emergency for a notification of other government agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. The licensee will notify OSHA. | ||
| ENS 55550 | 28 October 2021 17:40:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Two Monitoring Wells Exceeding NEI GPI Tritium Threshold Values | At 1340 EDT on October 28, 2021, Watts Bar Nuclear Plant (WBN) Units 1 and 2 initiated voluntary communication to the State of Tennessee and local officials as part of the Nuclear Energy Institute (NEI) Groundwater Protection Initiative (GPI), after receiving analysis results for two on-site monitoring wells that indicated tritium activity above the GPI voluntary communication threshold. The suspected source, a permitted release line, has been isolated, and additional corrective actions are in progress. This condition did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. | ||
| ENS 54753 | 22 June 2020 17:04:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification - Groundwater Initiative | At 1304 EDT on June 22, 2020, Watts Bar Nuclear Plant (WBN) Units 1 and 2 initiated voluntary communication to the State of Tennessee and local officials as part of the Nuclear Energy Institute (NEI) Groundwater Protection Initiative (GPI), after receiving analysis results for one on-site monitoring well that indicated tritium activity above the GPI voluntary communication threshold. WBN identified and corrected the cause. This condition did not exceed any NRC regulations or reporting criteria. This notification is being made solely as a four-hour, non-emergency notification for a Notification of Other Government Agency. This event is reportable in accordance with 10 CFR 50.72(b)(2)(xi). There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. | ||
| ENS 52400 | 29 November 2016 12:32:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Chemical Spill Onsite | On 11/29/16 at 0654 EST, a chemical spill of approximately 525 gallons of Flo-guard was reported to the main control room from the raw water system chemical treatment control building (near the intake pumping station). No personnel injuries have resulted from this spill. The spill has stopped and is contained to the immediate area of the building. The spill has not reached the waters of the United States. The hazardous constituent of Flo-guard is Zinc Chloride. Source of spill was a piping failure that allowed the contents of a storage tank to drain onto the ground in the immediate vicinity overnight. The area has been contained and does not impact any plant operations. At 0728, TVA determined that due to the volume of spill (approximately 525 gal.) being greater than 306 gal. of Zinc Chloride, this event is reportable under the WBN (Watts Bar Nuclear) Integration Pollution Prevention Plan. The Shift Manager notified the National Spill Response Center at 0732 and the Tennessee Emergency Management Agency at 0738. Rhea County Emergency Response, Nuclear Duty Officer and NRC Resident have been informed. This is being reported under 10 CFR 50.72(b)(2)(xi), 'Any event or situation, related to the health and safety of the public or onsite personnel, or protection of the environment, for which a news release is planned or notification to other government agencies has been or will be made,' due to the notification of other government agencies of the spill. | ||
| ENS 52163 | 9 August 2016 18:15:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Oil Sheen in Cooling Tower Basin | On 8/09/2016 at 1415 EDT, TVA (Tennessee Valley Authority) notified the National Response Center that Watts Bar Nuclear (WBN) Plant has noted an oil sheen in the Unit 2 Cooling Tower Basin. An oil sheen was observed within the Unit 2 Cooling Tower Basin at WBN. The sheen did not cover the entire cooling tower basin. The sheen covered approximately 4 square feet. No oil sheen was visible in the yard holding ponds or Tennessee river from the bank above the diffuser pipes. Notifications were also made to TEMA (Tennessee Emergency Management Agency). Oil levels from the suspected source did not indicate any change in oil reservoir levels. Unit 1 remains in Mode 1 at 85 (percent) power - reduced power due to main condenser back pressure limits. Unit 2 remains in Mode 1 at 25 (percent) power - initial startup testing. This event is reportable under 10 CFR 50.72(b)(2)(xi) as a condition that was reported to an outside Government Agency. The NRC Resident Inspector has been notified. | Main Condenser | |
| ENS 52126 | 26 July 2016 19:36:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Oil Sheen in Cooling Tower Basin | On 7/26/2016 at 1536 EDT, TVA (Tennessee Valley Authority) notified the National Response Center that Watts Bar Nuclear Plant had noted an oil sheen on the Cooling Tower Basin. An oil sheen was observed within the U1 Cooling Tower basin at WBN. The sheen did not cover the entire Cooling Tower basin. The sheen covered approximately two square feet. Estimate of oil released into the Cooling Tower basin is less than four ounces. No oil sheen was visible in the Tennessee River from the bank above the diffuser pipes. Notifications were also made to TEMA (Tennessee Emergency Management Agency). Follow-up observations within 20 minutes of the sheen being reported indicated that the oil sheen had dissipated and was no longer visible. Oil levels from the suspected source did not indicate any change in oil reservoir levels. Unit 1 remains in Mode 1 at 79 percent power - reduced power due to main condenser back pressure limits. Unit 2 remains in Mode 1 at 74 percent power - initial startup testing This event is reportable under 10 CFR 50.72(b)(2)(xi) as a condition that was reported to an outside Government Agency. The NRC Resident Inspector has been notified. | Main Condenser | |
| ENS 52021 | 18 June 2016 15:06:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notifications to Uscg National Response Center and Tema | On 6/18/16 at 1106 EDT, TVA (Tennessee Valley Authority) notified the National Response Center that Watts Bar Nuclear Plant has an oil sheen on the Cooling Tower Basin. 1. Oil sheen was observed within the Cooling Tower basin at WBN (Watts Bar Nuclear). Sheen was light brown to red and did not cover the entire Cooling Tower basin. Estimate of oil released into the Cooling Tower basin is less than 1 quart. 2. No oil sheen was visible in the Tennessee River from the bank above the diffuser pipes. 3. Notifications were also made to TEMA (Tennessee Emergency Management Agency). 4. Follow-up observations within one hour of the sheen being reported indicated that the oil sheen had dissipated and was no longer visible. Oil levels from the suspected source did not indicate any change in oil reservoir levels. Unit 1 remains in Mode 1 at 92% power - reduced power due to main condenser back pressure limits Unit 2 remains in Mode 1 at 33% power - initial startup testing This event is reportable under 10 CFR 50.72(b)(2)(xi) as a condition that was reported to an outside Government Agency. The NRC Resident Inspector has been notified. | Main Condenser | |
| ENS 51885 | 27 April 2016 02:13:00 | 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 | Alert and Notification System Feedback System Inoperable | On April 26, 2016 at 2213 EDT, Watts Bar Nuclear Plant authorized notification of State agencies for the partial loss of the WBN Alert and Notification System (ANS) feedback system. The ANS feedback system provides monitoring capability of the off-site sirens surrounding the facility in the event of a plant Emergency. Without the feedback system in service, sirens may be activated remotely from State and local facilities but verification of successful activation is impaired. State agencies were notified to evaluate if other methods of alerting the public were warranted. No compensatory methods are required for this failure, as the ANS activation feedback systems remain fully functional at the State and local facilities. The cause for the loss of the ANS feedback system is under investigation. This is being reported under 10 CFR 50.72(b)(2)(xi) and 10 CFR 50.72(b)(3)(xiii). The NRC Senior Resident has been notified.
The cause of the partial loss of WBN ANS Feedback System was determined to be an equipment failure. AT&T has completed the work and the modem has been reset. The Corporate TVA Operational Duty Specialist (ODS) has been monitoring (the system) and there have been no issues identified with the feedback system. Therefore, the issue has been repaired. In addition, further confirmation from the State of Tennessee and Rhea County was received that the sirens were fully functional at all times. The Feedback Monitoring System for the ANS was not available to the ODS only. Therefore, TVA Watts Bar is retracting the 10 CFR 50.72 (b)(3)(xiii) notification for Loss of Emergency Preparedness Capabilities. The licensee has notified the NRC Resident Inspector. Notified the R2DO (Ehrhardt). | ||
| ENS 50580 | 30 October 2014 15:00:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification and Press Release Regarding Boone Dam Stability Issues | On October 30, 2014, at 1100 EDT, TVA conducted a briefing for government officials and other stakeholders regarding the decision to accelerate the Boone Reservoir annual drawdown after discovery of a sink hole near the base of the embankment and a small amount of water and sediment found seeping from the river below the dam. TVA is continuously monitoring the dam and conducting an investigation to determine the source of the water seepage. The dam is located upstream of all three TVA nuclear sites. There are currently no nuclear plant operability or safety issues, and TVA is assessing the impacts on the plant licensing bases. A press release was issued at approximately 1300 EDT. This notification is being made in accordance with 10 CFR 50.72(b)(2)(xi) due to notification of other government agencies and a news release. The NRC Senior Resident Inspector was notified. The licensee is evaluating this event for potential impact on the design basis flooding level. | ||
| ENS 49950 | 24 March 2014 16:55:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Death of Employee | On March 24, 2014, at approximately 0200 EDT, with Watts Bar Nuclear Unit 1 at 0% power while commencing a planned refueling outage and Unit 2 under construction, a radiation protection technician was found unresponsive in the protected area. An emergency medical team responded and the individual was transported off site to a medical facility where he was pronounced dead at 0530 EDT. The individual was not contaminated and there were no radiological or industrial safety issues associated with Watts Bar Nuclear Plant. Due to notification of OSHA at 1255 EDT, this report is submitted pursuant to 10 CFR 50.72(b)(2)(xi), as a notification to a government agency. The NRC Senior Resident Inspector has been notified. | ||
| ENS 49736 | 17 January 2014 16:43:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Onsite Death of an Employee | On January 17, 2014, at approximately 0931 EST, with Watts Bar Nuclear Unit 1 at 100% power and Unit 2 under construction, an off duty security officer was found unresponsive in a personal vehicle in an owner controlled parking lot located outside of the Protected Area. An emergency medical team responded and the individual was transported off site to a nearby medical facility where he was pronounced dead at 1143 EST. The individual was not contaminated and there were no radiological or industrial safety issues associated with Watts Bar Nuclear Plant. Due to notification of local sheriff and OSHA, this report is submitted pursuant to 10 CFR 50.72(b)(2)(xi), as a notification to a government agency. NRC Senior Resident Inspector has been notified. | ||
| ENS 49650 | 18 December 2013 14:32:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Contract Employee Collapsing within the Protected Area | On December 18, 2013, at approximately 0700 EST, with Watts Bar Nuclear Unit 1 at 100% power and Unit 2 under construction, a contract employee on his way to his job site collapsed. The emergency team responded and the individual was transported via ambulance offsite. The individual was declared deceased at Rhea County Medical Center. The individual was not contaminated. Due to a required report to OSHA at 0932 EST, this report is submitted pursuant to 10 CFR 50.72(b)(2)(xi), as a notification of other government agency. NRC Senior Resident Inspector has been notified. | ||
| ENS 48950 | 21 April 2013 06:11:00 | 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 Shots Fired within the Owner Controlled Area | An unidentified individual fired a shot at a site security vehicle. "Watts Bar Nuclear Plant Declared a Notice of Unusual Event (NOUE) at 0211 EDT April 21, 2013. (The licensee notified) Rhea and Meigs County Sheriff departments for on-site support. A notification of the event discussed above was made to the State of Tennessee. A notification of the event discussed above was made (to the) U.S. Department of Energy (DOE) Electricity Delivery and Energy Reliability." The licensee notified the NRC Resident Inspector. Notified DHS, FEMA, USDA, HHS, DOE, NICC, EPA, FBI SIOC and Nuclear SSA via email. * * * UPDATE FROM DAMON FEGLEY TO PETE SNYDER AT 0634 EDT ON 4/21/13 * * * This information is being provided to the NRC for a 10CFR50.72(b)(2)(xi) notification. TVA is planning on making a news release to local media affiliates and posting the news release on TVA's website. This news release is in reference to the Notification of Unusual Event (NOUE) Watts Bar Nuclear Plant recently entered for a security condition. Notified R2DO (Vias).
(At) 1230 EDT Watts Bar Nuclear plant terminated the Notification of Unusual Event. TVA is planning on making an additional news release to local media affiliates and posting the news release on TVA's website. This news release is in reference to the Notification of Unusual Event (NOUE) Watts Bar Nuclear Plant recently terminated. The licensee notified the NRC Senior Resident Inspector. Notified the R2 IRC, IRD (Grant), NSIR (Wiggins), NRR (Uhle), ILTAB (Johnson), DHS, FEMA, USDA, HHS, DOE, NICC, EPA, FBI SIOC and Nuclear SSA via email. | ||
| ENS 48075 | 6 July 2012 14:12:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Loss of 7 Offsite Sirens Due to Inclement Weather | On the evening of July 5, 2012, a severe thunderstorm warning was issued by the National Weather Service for the Tennessee Valley Authority (TVA) area. These storms included wind and tree damage to the surrounding area. On the morning of July 6, 2012, TVA pulsed the sirens in the emergency response system by providing an electrical signal to each of the siren towers. It was determined there had been localized power outages and possible tree damage to 7 out of the total of 99 offsite sirens. While the number of sirens out does not meet the required notification, this data was given to the state for informational update. This information was provided to the Tennessee Emergency Management Agency (TEMA) at 1012 EDT. Due to the interaction with the state and local government agencies, this report is being made as a four hour notification under 10 CFR 50.72(b)(2)(xi). The sirens will be repaired as needed and returned to service. There were no plant events that required siren actuation, and all plant systems are operating as required. The NRC Senior Resident Inspector has been notified. | ||
| ENS 47348 | 18 October 2011 00:50:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unit 1 Declared an Unusual Event Based on Ammonia Levels Exceeding Osha Limits | Normal Operation of WBN (Watts Bar Nuclear) Unit 1 impeded in the Turbine Building, El. 685, West side of the Unit 1 Main condenser due to Toxic Gas (ammonia) concentrations of 75-79 ppm exceeding the OSHA Permissible Exposure Limit (PEL) of 50 ppm, and the ACGIH (American Conference of Governmental Industrial Hygienists) limit of 25 ppm. WBN Unit 1 returned to approximately 100% RTP on Monday, October 17, 2011, following a maintenance outage. Suspect excessive ammonia concentrations due to condenser vacuum pump continuous drains which may need throttling open to increase drain flow, following Unit startup. (Ammonia is used to treat feedwater for secondary chemistry control). There have been no injuries from this event. NRC Senior Resident (Inspector) has been notified. (Event Class 4.4.A, Toxic Gas, Unusual Event). The licensee informed both the State and local agencies. Notified FEMA (Blankenship) and DHS (Konopka).
At 0047 EDT on 10/18/2011, the licensee terminated the Notification of Unusual Event condition based on ammonia concentrations having been reduced to approximately 6 ppm. Normal personnel access to the affected area has been restored. Unit 1 remained at 100% power during this event with no changes or challenges to plant operations. During the event there were no additional EAL designators. During the event there were no significant changes in plant conditions. During the event there were no significant changes in plant radiological conditions. During the event there were no offsite protective recommendations made by the licensee. The licensee notified the NRC Resident Inspector and State and local agencies. Notified R2DO (Lesser), NRR EO (Brown), IRD (Morris), DHS (Gates), and FEMA (Blankenship).
This information is being provided to the NRC for a 10CFR50.72(b)(2)(xi) notification. TVA is planning on making a news release to local media affiliates and posting the news release on TVA's website. This news release is in reference to the Notification of Unusual Event (NOUE) Watts Bar Nuclear Plant recently entered and exited for ammonia levels exceeding OSHA limits (reference EN 47348 and update). The licensee notified the NRC Senior Resident Inspector." Notified R2DO (Lesser). | Feedwater Main Condenser | |
| ENS 47021 | 4 July 2011 17:36:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Spurious Siren Activation | TVA received notification from Tennessee Emergency Management Agency (TEMA) at 1336 Eastern Daylight Saving Time (EDT) that Rhea County 911 operators had received several calls (approximately 6) regarding a siren sounding in north Rhea County. An electronic poll of the siren closest to the location of the reporting parties (Siren 43) indicated no response, although that siren did successfully respond to the 0700 daily poll on 7/4/2011. This may indicate that this siren is not operable. A severe thunderstorm warning had been issued by the National Weather Service for the time period this potential activation was reported. During this period there were several spurious acoustic monitor alarms from three additional sirens, although there were no other indications of siren activations (e.g., rotate or timer signals). A field investigation has been initiated, and the siren will be repaired as needed in accordance with TVA's corrective action program. There was no plant event that required siren actuation, and all plant systems are operating as required. The licensee will notify the NRC Resident Inspector. | ||
| ENS 46967 | 16 June 2011 17:09:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Chemical Release from Intake Pumping Station. | A notification of the event discussed below was made to the Tennessee Department of Environment and Conservation (TDEC) at approximately 09:48 (hrs EDT) on June 17,2011. As a result of the notification made to the state, NRC is being notified in accordance with 10 CFR 50.72(b)(2)(xi), 'News Release or Notification of Other Government Agency.' On June 16, 2011, a chemical treatment of the raw water system for Watts Bar Nuclear Plant (WBN) was underway. The treatment was a routine injection of biocide (Sodium Hypochlorite and Flogard MS6237) for the treatment of microbiologically induced corrosion (MIC) and to inhibit the growth of asiatic clams. At approximately 13:09 (hrs EDT) on June 16, 2011, WBN personnel noticed that a small stream of water was releasing through the splash guard of a trough on the outside (lake side) of the Intake Pumping Station (IRS) and entering the Intake Forebay. This initial leak was secured by approximately 14:30. At approximately 14:35, a second leak from a broken pipe was identified. The second leak was terminated at approximately 16:05. The cause of the initial leak was determined to be a tree growing in a trough in the intake structure and degraded sealant on the trough's splash guard. TVA's (Tennessee Valley Authority) biologist performed a survey of the intake channel and the river downstream from the plant and found no dead fish or abnormal bird activity. TVA's review of the chemical release to the lake determined that no Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) reportable quantities were exceeded. The reporting requirements contained in WBN's Environmental Protection Plan (EPP) were reviewed and not found applicable to this event. WBN's (NRC) Resident Inspector has been notified of the event and the need for the event notification. | ||
| ENS 46469 | 6 December 2010 13:15:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification - Osha Contacted Due to Fatality of Contractor Employee | At 0815 Eastern Standard Time on December 6, 2010, TVA Construction Contractor, Bechtel, notified the Occupational Safety and Health Administration (OSHA), in accordance with 29 CFR 1904.39, that a Bechtel employee had suffered a fatality from an apparent heart attack, while working on the Watts Bar Unit 2 Construction completion project. This information was also provided to Tennessee Department of Labor and Workforce Development, Division of Occupational Safety and Health (TOSHA). This event had no consequences to the health and safety of the public, other onsite workers, or the environment. The NRC Resident Inspector has been notified of this event. The employee's heart attack happened while he was operating a fork lift at the Parts/Receiving area. Offsite responders were called to the scene, however, the employee was unresponsive to their actions. Employee was transported to the Rhea County Hospital where he was pronounced dead. | ||
| ENS 46448 | 2 December 2010 21:10:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to an Individual Contamination | TVA notified TN Dept of Environment and Conservation (TDEC) of an incident at Watts Bar as follows: On December 2, 2010, a contractor employee of PAR-Westinghouse was processing in through Watts Bar Nuclear Plant Radiological Protection Program for his first day of work. He was discovered to have been previously contaminated with radioactive material from another worksite. It is clear that the radioactive contamination did not come from any TVA source and was found before he entered the rad control area. The contamination was discovered during required in-processing activities for workers by TVA's radiation monitoring and detection equipment. The contamination was found to be a particle on the individual's shoe. The individual's clothing was also found to contain measurable contamination and was confiscated. The radioactive contamination found on the individual has been safely contained. TDEC Division of Radiological Health was notified of this event as of 1610 Eastern Time and this notification under 10 CFR 50.72(b)(2)(xi) is for that Government Agency notification. TVA has notified the NRC Resident Inspector and Regional Administrator of this incident. | ||
| ENS 43002 | 21 November 2006 11:15:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release 10 CFR 50.72(a)(1)(i), Emergency Class Declaration | Unusual Event Declared Due to Unidentified Leakage | Licensee reported 20 GPM of unidentified leakage from indication of VCT lowering level. RCS pressure is 50 psig. Source of the leak has not been identified and it is not known at this time where the RCS leakage is going. All air and liquid releases are within specifications and no protective action recommendations are needed at this time. The licensee has notified the State and Local emergency agencies. The licensee will notify the NRC Resident Inspector.
Unidentified leakage is now calculated to be 2 GPM based on inventory balance using charging and letdown flow and VCT level. It is believed that the indication of a leak may be from an incomplete vacuum fill of the S/G after the S/G replacement modification and when the RCS was pressurized, the remaining voids in the S/Gs were filled. There has been no visible leakage found outside of the RCS. Notified NRREO (Wermiel), R2DO (Haag), IRD Manager (Wilson / Leach).
The licensee terminated the Unusual Event (UE) at 0737 due to indicated RCS leakage being less than 2 GPM. The site's emergency action criteria for a UE is 10 GPM unidentified leakage. No water has been found to have leaked outside the RCS. The licensee notified the NRC Resident Inspector. Notified NRREO (Wermiel, Ross-Lee), R2DO (Haag), IRD Manager (Wilson, Leach), DHS SWO (Gray), FEMA (LaForty)
The cause of the apparent leakage is under investigation by plant and TVA personnel. No actual leakage is believed to have transpired. Current plant conditions are stable. The licensee notified the NRC Resident Inspector. Notified R2DO (Haag), NRREO (Ross-Lee), IRD Manager (Wilson)
As a result of the declaration of a Notification of Unusual Event earlier today relative to a suspected RCS leak, a News Release is being made. The purpose of the release is to clarify to local officials and residents the nature of the suspected leak and the actions taken by school officials. The cause of the suspected leak remains under investigation. The licensee notified the NRC Resident Inspector. Notified R2DO (Haag). | ||
| ENS 41400 | 10 February 2005 22:01:00 | 10 CFR 50.72(b)(2)(xi), Notification to Government Agency or News Release | Offsite Notification Due to Tritium Sample Exceeding Offsite Dose Calculation Manual (Odcm) Reporting Level | The following information was obtained from the licensee via facsimile: On 2/10/2005 with Watts Bar, Unit 1 operating at 100 percent Reactor Power, TVA plans to voluntarily notify the State of Tennessee's radiological and environmental health agencies and Department of Energy that a tritium sample obtained from a onsite monitoring well was confirmed to be above the Offsite Dose Calculation Manual (ODCM) reporting level for ground water samples. This result was for an ODCM required composite sample obtained over a month (12/29/04 through 1/25/05). On 2/8/2005, Chemistry confirmed this result and established a team to investigate the source of this contamination, the cause of the increased tritium levels, and the extent of where the tritium is found. Additional samples have been collected from selected monitoring wells, and the results of these tests are being analyzed. At this time, there is no indication of any offsite release, there is no threat to the public or company employees, and the situation does not pose a public health hazard. This notification is in accordance with 10 CFR 50.72, (b)(2)(xi), 'News Release or Notification of Other Government Agency'. The licensee has notified the NRC Resident Inspector. | ||
| ENS 41049 | 17 September 2004 09:00:00 | 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 | Loss of Emergency Siren Capability and Notification of Offsite Agency | On Sept. 17, 2004, with Watts Bar Unit 1 at 100% power, the main control room was notified that the 99 sirens which make up the Public Prompt Notification System were not functional. The system uses two repeaters to control the sirens. As the remnants of Hurricane Ivan were passing through the Tennessee River Valley one of the repeaters (Pone Knob) was found to be without power around midnight. The siren system operators confirmed the second repeater (Grandview) was still functioning. Approximately 5:00 a.m., however, communications were lost with the second repeater. A maintenance crew was dispatched to the second repeater on loss of communications and they determined the radio transmitter was not functioning at 0955 and Watts Bar was immediately notified. This event is reportable under 10 CFR 50.72(b)(3)(xiii) as a loss of emergency preparedness capability. . As a result of the above siren loss, TVA notified the Tennessee Emergency Management Agency (TEMA) at 10:13a.m. Sept. 17, 2004. This government agency notification is reportable under 10 CFR 50.72(b)(2)(xi). No TVA press release is planned and TVA is not aware of any specific actions planned to be taken by TEMA. Maintenance activities to restore power to the first repeater station by the use of a portable generator are underway. The 99 sirens constitute 100% of the emergency siren capability. The licensee had no estimate for completion of repairs and restoration of the siren capability. The licensee informed the State of Tennessee and the NRC Resident Inspector.
Restoration of power by use of a portable generator has been completed, reducing the number of non-functional sirens to seven of ninety-nine. The licensee informed local and State authorities, and the NRC Resident Inspector. Notified R2 DO (A. Boland). |