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 Entered dateSiteRegionReactor typeEvent description
ENS 542565 September 2019 16:53:00CatawbaNRC Region 2This is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. A condition impacting functionality due to a loss of cooling of the Technical Support Center (TSC) ventilation system occurred on 4/28/19. Filtration capability was not impacted by this condition. Maintenance subsequently repaired the condition and the TSC ventilation system was returned to service on 5/1/19. This condition did not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) as the discovered condition affected the functionality of an emergency response facility."
ENS 5423320 August 2019 20:00:00CatawbaNRC Region 2While performing a purification on the Unit 2 Refueling Water Storage Tank (FWST), it was discovered that the single train system was inoperable due to the level being less than the required volume per SR (Surveillance Requirement) 3.5.4.2. The condition was discovered on 8/18/19 at 1700 (EDT). The FWST level was restored to greater than the required volume per SR 3.5.4.2 at 1744 on 8/18/19. This condition is being reported as an eight-hour, non-emergency notification per 10 CFR 50.72(b)(3)(v)(D) for an event or condition that could have prevented the fulfillment of a safety function. There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
ENS 5376230 November 2018 04:22:00CatawbaNRC Region 2

At 2300 EST on November 29, 2018 Catawba Nuclear Station (CNS) requested offsite transport for treatment of a contractor to an offsite medical facility. Upon arrival of the offsite medical personnel, the individual was declared deceased at 2354 EST on November 29, 2018.

The fatality was not work-related and the individual was outside of the Radiological Controlled Area.

No news release by CNS is planned. Notifications are planned to the South Carolina Division of Occupational Safety and Health. 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 5182428 March 2016 15:43:00CatawbaNRC Region 2Westinghouse PWR 4-LoopA non-licensed, licensee supervisory employee had a confirmed positive test for alcohol during a random fitness-for-duty test. The employee's access to the plant has been suspended. The licensee notified the NRC Resident Inspector.
ENS 5168425 January 2016 15:26:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) as the discovered condition affects the functionality of an emergency response facility. A condition impacting functionality due to a loss of cooling of the TSC (Technical Support Center) Ventilation system was discovered on 1/25/2016. At 1030 (EST), maintenance personnel reported the compressor local power breaker was tripped open and that all 3 phases of the compressor indicated grounded. Maintenance will begin repairs as soon as parts are made available. Estimated time to repair is unknown at this time. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable. If relocation of the TSC becomes necessary, the Emergency Coordinator will relocate the TSC staff to an alternate location in accordance with applicable emergency plan implementing procedures. The Emergency Response Organization team will be notified of the condition and the possible need to relocate during an emergency. This condition does not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified.
ENS 516355 January 2016 16:07:00CatawbaNRC Region 2Westinghouse PWR 4-LoopA condition impacting functionality of the TSC (Technical Support Center) ventilation system was discovered on 1/5/2016 at 1120 (EST). The issue involves a loss of cooling capability of the TSC ventilation system due to a failed compressor. Maintenance will begin repairs as soon as parts are made available. Estimated time to repair is unknown at this time. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable. If relocation of the TSC becomes necessary, the Emergency Coordinator will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team will be notified of the condition and the possible need to relocate during an emergency. This condition does not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified.
ENS 5110329 May 2015 20:17:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

This is non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) as the discovered condition affects the functionality of an emergency response facility. A condition impacting functionality of the TSC (Technical Support Center) Ventilation system was discovered on 05/29/2015 at 1230 (EDT). The issue involves a loss of cooling capability of the TSC ventilation system due to a failed relay. Maintenance will begin repairs at 0700 (EDT) on 05/30/2015. Estimated time to repair is unknown at this time. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Coordinator will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team will be notified of the condition and the possible need to relocate during an emergency. This condition does not affect the health and safety of the public or station employees. An update will be provided once the TSC ventilation has been restored to normal operation. The NRC Resident Inspector will be notified.

  • * * UPDATE FROM AARON MICHALSKI TO DANIEL MILLS AT 1557 EDT ON 6/12/15 * * *

The TSC ventilation system has been returned to service. The licensee will notify the NRC Resident Inspector. Notified R2DO (Guthrie).

ENS 505229 October 2014 11:30:00CatawbaNRC Region 2Westinghouse PWR 4-LoopA non-license supervisor has been found in violation of the Duke Energy Fitness for Duty Policy. The individual's access to the plant has been suspended. The NRC Resident Inspector has been informed. The licensee will be notifying State and Local authorities.
ENS 5031629 July 2014 05:05:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency eight hour notification for a loss of emergency assessment capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 07/29/2014 to the Technical Support Center (TSC) HVAC. The work includes performance of breaker inspections and corrective/preventative AHU (Air Handling Unit) maintenance. The planned work activity duration is approximately 48 hours. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency. The NRC Resident Inspector has been notified. This condition does not affect the health and safety of the public or station employees. The licensee will be notifying state and local authorities.
ENS 499902 April 2014 21:08:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency notification. As part of converting to NFPA (National Fire Protection Association) 805, Catawba determined that there are conditions that may not ensure required equipment remains available under certain postulated fire scenarios. The determination concluded that the effects of a postulated fire in specific fire areas could prevent critical systems or components from performing their intended functions, potentially resulting in the inability to achieve and maintain safe shutdown. Affected fire areas are as follows (elevation numbers are in parentheses): 1. Residual Heat Removal/Containment Spray Pump Room (522) 2. Unit 2 Auxiliary Feedwater Pump Room (543) 3. Unit 1 Auxiliary Feedwater Pump Room (543) 4. Auxiliary Building Common Area (543) 5. Unit 2 Electrical Penetration Room (560) 6. Unit 1 Electrical Penetration Room (560) 7. 2ETB Switchgear Room (560) 8. 1ETB Switchgear Room (560) 9. Unit 2 Battery Room (554) 10. Unit 1 Battery Room (554) 11. Auxiliary Building Common Area (560) 14. Unit 2 ETA Switchgear Room (577) 15. Unit 1 ETA Switchgear Room (577) 17. Unit 1 Cable Room (574) 18. Auxiliary Building Common Area (577) 20. Unit 1 Electrical Penetration Room (594) 45. Unit 1 Cable Room Corridor (574) 46. Unit 2 Cable Room Corridor (574) 48. Unit 2 Inside Doghouse 49. Unit 1 Inside Doghouse RB1. Unit 1 Reactor Building RB2. Unit 2 Reactor Building This is reportable as an unanalyzed condition that significantly degrades plant safety in accordance with 10 CFR 50.72(b)(3)(ii)(B). Fire watches have been implemented as appropriate in response to this determination. This condition has been entered into the Catawba Corrective Action Program. The NRC Resident Inspector will be notified. The licensee will notify the State of North Carolina and South Carolina and well as the local counties.
ENS 4995624 March 2014 21:30:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

This is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 03/24/14 starting at approximately 2300 (EDT) to the Technical Support Center (TSC) ventilation system. The work includes performance of planned carbon bed filter sample. The planned work activity duration is approximately 5 hours. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The NRC Resident Inspector has been notified. This event poses no threat to the public or station employees.

  • * * UPDATE FROM THOMAS GARRISON TO HOWIE CROUCH AT 0325 EDT ON 3/25/14 * * *

The TSC was returned to service at 0325 EDT on 3/25/14. The licensee will be notifying the NRC Resident Inspector. Notified R2DO (Shaeffer).

ENS 4945721 October 2013 15:02:00CatawbaNRC Region 2Westinghouse PWR 4-LoopA spill of greater than 100 gallons of water, containing a low-level tritium concentration with the potential to reach groundwater has occurred on the Catawba site. The tritium levels in this water were 8,314 picocuries per liter, less than one-half of the US Environmental Protection Agency drinking water standard for tritium of 20,000 picocuries per liter. While conducting planned Unit 2 maintenance activities, water from the main condenser was being pumped to a site collection pond and overflowed due to exceeding capacity. The source of the spill was stopped. Based upon the on-site spill location and low tritium levels, there is no health or safety risk to the public or employees. In accordance with the industry voluntary Groundwater Protection Initiative, the NRC Resident Inspector, states, and counties will be notified.
ENS 4942610 October 2013 15:19:00CatawbaNRC Region 2Westinghouse PWR 4-LoopOn August 5, 2013, annunciators were received for diesel generator (DG) 2B low lube oil inlet and outlet temperature. Investigation revealed that a control relay in motor control center cubicle 2EMXF F02D was not operating as expected. A work order was generated to replace the relay. While working the work order, a relay contact pad was found resting next to the relay. An inspection of the relay revealed that the contact pad came from the backside of the left movable contact. With the relay coil in the energized state and the contact pad missing, the relay contact would not engage. This prevented the lube oil heaters from energizing. The failed relay was sent to the Duke Energy Metallurgy Laboratory. It was observed that the gold brazing material was miniscule where the pad should have been attached. The laboratory observed the same brazing issue with the adjacent relay contact pads that were still attached on the failed relay. The material could barely be seen under the pads: it should have protruded out the edges for good brazing. It was determined that the overseas manufacturer of the relays had insufficiently bonded the relay contact pads to the movable contact arms for at least one known batch of relays. The failed relay is a Cutler-Hammer relay, Model Number 9575H3A000. The failed relay had been installed on July 30, 2013 to replace obsolete relay Model Number 9575H2612A. The replacement relay type was purchased by Duke Energy as a commercial grade item and dedicated for use in safety related applications. The failed relay batch number is 1111AF. Similar relays had been installed in the DG lube oil sump tank heater and the DG jacket water heater applications for DGs 2A and 2B. Duke Energy concluded that for these two installed applications, no substantial safety hazard existed, as DGs 2A and 2B were determined to be operable. (The heaters operate while the DGs are in standby to maintain required lube oil and jacket water temperature. Failure of these heaters to automatically start would be detected by alarms and the DGs could be started to maintain temperature. The heaters do not operate when the DGs are running.) However, because similar affected relays were in inventory, they theoretically could have been utilized in other safety related applications (even though they were not actually utilized in any other safety related applications). The most significant safety related applications where the affected relays could have been utilized were in circuitry associated with safety related ventilation system fans. Had they been utilized in these systems, a failure could have prevented the affected ventilation system fan from starting on an actuation signal. Catawba's evaluation that concluded that this issue could have resulted in a substantial safety hazard was completed on October 7, 2013. However, there was no actual impact to public health or safety. The required company officer notification was made on October 9, 2013. Catawba is the only Duke Energy site that had the affected relays. In addition, none of the affected relays were sold or transferred to other utilities by Duke Energy. Notifications will he made to the Catawba NRC Resident Inspector and to the required state and local agencies. The licensee will also be notifying North and South Carolina State, York, Gaston, and Mecklenburg Counties.
ENS 493194 September 2013 04:13:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10CFR50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 09/04/13 to the Technical Support Center (TSC) HVAC. The work includes performance of planned outside air intake valve electrical repair. The planned work activity duration is approximately 12 hours. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency. The NRC Resident Inspector has been notified. This event poses no threat to the public or station employees.
ENS 4931128 August 2013 03:20:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 08/28/13 in the Technical Support Center (TSC) HVAC. The work includes performance of planned outside air intake valve electrical troubleshooting. The planned work activity duration is approximately 16 hours. If an emergency is declared requiring TSC activation during period, the TSC will be staffed and activated using existing emergency planning procedure unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency. The NRC Resident Inspector has been notified. The event poses no threat to the public or station employees.
ENS 4919516 July 2013 14:20:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis 60-day optional report as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10 CFR 50.73 (a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Nuclear Service Water (RN) system. This event had no impact on public health and safety. During work to replace a timer associated with an RN (Nuclear Service Water) level circuit, electrical adapters and jumpers were installed incorrectly, resulting in generation of an Emergency Low Pit Level signal. This resulted in an unplanned actuation for RN to realign its suction source from Lake Wylie (normal source) to the alternate source, the SNSWP (Standby Nuclear Service Water Pond). On 5/28/13, with both units at 100% power, a lo-lo level signal was received for A Train RN Pit, initiating the realignment to the SNSWP for both A and B trains. Prior to this event, both trains of RN were aligned to the SNSWP for maintenance. The lo-lo level signal did initiate a start of all available RN Pumps. Associated valves, including RN crossover valve, return header isolation valves and non-essential header isolation valves closed as expected. This separated RN trains A and B. This was a complete actuation for Train A and the system performed as designed for existing plant conditions. This event was entered into the site corrective action program for resolution. The licensee will notify the NRC Resident Inspector, as well as, the State and local governments.
ENS 4916130 June 2013 22:53:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

The Auxiliary Feedwater System was inoperable due to elevated hotwell temperatures from 1720 to 1739 EDT on 6/30/13. At no time was there a risk to the health and safety of the public. The elevated hotwell temperatures resulted from the loss of multiple cooling tower fans due to a lightning strike. Cooling tower fans and hotwell temperatures have been restored. Power was slightly reduced solely to maintain condenser vacuum until cooling tower fans were restored. At Catawba, the hotwell is a credited water supply for the auxiliary feedwater system. The unit is currently in a power ascension back to 100%. No other plant equipment was affected by the lightning strike. The licensee will be notifying the state warning points in both North and South Carolina and local warning points in Gaston, York, and Mecklenburg counties. They have notified the NRC Resident Inspector.

  • * * RETRACTION FROM TOM GARRISON TO VINCE KLCO ON 8/4/13 AT 0357 EDT * * *

Catawba Nuclear Station is retracting EN #49161 based on completion of evaluation of auxiliary feedwater system operability. The engineering department performed this evaluation using existing plant conditions during the event to verify existing safety analyses remain bounding and conservative. The evaluation concluded that sufficient volume of secondary condensate was available below the required temperature from the Upper Surge Tanks (USTs), in combination with the hotwell inventory as normally aligned, for the auxiliary feedwater system to remain operable during this event. This condition is not reportable under 10CFR50.72(b)(3)(v)(B). The licensee will notify the NRC Resident Inspector, State and Counties. Notified the R2DO (King).

ENS 4903615 May 2013 15:00:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency 30 day notification for missing licensed material. This event is reportable in accordance with 10CFR20.2201(a)(1)(ii). On April 16, 2013, while performing the required semi-annual source leak check and inventory, Radiation Protection personnel could not locate the source label tag or cable for source RMC-0169 on radiation monitor 1EMF44H (This monitor has not been in use since 1995). The monitor's pre-amplifier box had been removed as well. 1EMH44H was inspected and the source was not found within the housing. A search was conducted for this missing source, however it could not be located. During the previous source leak check and inventory on October 4, 2012, the source was in its expected location. Source RMC-0169 is a 200 milligram depleted uranium source. The total original activity of the source was 9.998E-02 microCuries (3.03E-02 micro curies; U-234; 1.98E-03 microCuries; U-235, 6.77E-02 microCuries; U-238). The reportable limit for U-234 (the shortest-lived isotope in the source is U-234 with a half-live of 2.46E+05 years) is 0.01 microCuries per 10CFR20, Appendix C. Based on the activity of U-234 present in the source of 0.03 microCuries, this 30 day phone notification to the NRC is being provided pursuant to 10CFR22.2201(a)(1)(ii). The external dose to an individual from this source is negligible due to the small quantity and the type of material involved. Therefore, this event has no adverse effect upon the health and safety of employees or the public. The required written report pursuant to 10CFR20.2201(b)(1) will be provided to the NRC within 30 days of the telephone notification. The NRC Resident Inspector has been notified. The licensee with notify State and local authorities. THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf
ENS 4903215 May 2013 02:52:00CatawbaNRC Region 2Westinghouse PWR 4-LoopSample exceeding the industry groundwater protection initiative related to radioactivity in groundwater for which a news release is planned and notification to other government agencies will be made. A leak greater than 100 gallons containing tritium has the potential to reach groundwater. The source has been identified. Actions to isolate this source are being initiated. The licensee has identified a leak in a fiberglass discharge pipe from the turbine building sump. The licensee estimates that greater than 100 gallons of water has been discharged through the leak at the present time. The licensee is in the process of installing a temporary sump pump in the turbine building sump in order to isolate the discharge path. Samples indicate a tritium concentration of 8.964 E-6 uCi/mL. The licensee will notify state and local government agencies. A press release is planned. The licensee will notify the NRC Resident Inspector.
ENS 488782 April 2013 16:25:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non emergency eight hour notification for a loss of Emergency Assessment Capability. This event is reportable in accordance with 10 CFR 50.72(b)(3)(xiii) because the work activity affects the functionality of an emergency response facility. Planned maintenance activities are being performed on 4/3/13 to be Technical Support Center (TSC) HVAC. The work includes removal of a pressurizing ventilation fan and opening ventilation system ductwork. The planned work activity duration is approximately 48 hours. If an emergency is declared requiring TSC activation during this period, the TSC will be staffed and activated using existing emergency planning procedures unless the TSC becomes uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC becomes necessary, the Emergency Director will relocate the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team has been notified of the maintenance and the possible need to relocate during an emergency. The NRC Resident Inspector has been notified. The State of North Carolina will be notified.
ENS 487175 February 2013 12:26:00CatawbaNRC Region 2Westinghouse PWR 4-LoopTechnical Support Center (TSC) ventilation was removed from service on 2/5/13 at 0545 EST to complete scheduled maintenance activities. Without proper ventilation, habitability of the TSC cannot be assured. Work duration is planned to complete today. In the event TSC activation is required, approved procedures are in place to establish an alternate location, if necessary. The licensee will make courtesy notifications to state and local agencies. The licensee notified the NRC Resident Inspector.
ENS 4870629 January 2013 16:46:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis 60-day optional report as allowed by 10 CFR 50.73(a)(1), is being made under the reporting requirement in 10 CFR 50.73(a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Auxiliary Feedwater (AFW) system. On December 22, 2012 at 0142, with Unit 1 in Mode 4, the 1A AFW pump automatically started due to failure to reset the signal created when the 1B Feedwater Pump was tripped for testing. The 1A feedwater pump was already in the 'tripped' condition when the 1B feedwater pump was tripped, resulting in an auto start signal being generated for the AFW system. Both trains of the AFW had the auto start defeat instated at the time of the testing of the 1B Feedwater pump, blocking the start signal. During subsequent alignment of the AFW for standby readiness, the auto start defeat was removed from the 1A AFW system without resetting the system to remove the signal generated during the 1B Feedwater pump testing, resulting in the actuation of the system. The 1B Feedwater Pump had been reset and was in service therefore the signal associated with the trip of both feedwater pumps was not consistent with the actual plant conditions at the time that the auto start defeat was removed from the 1A AFW system. Following the auto start of the 1A motor driven AFW pump, operators confirmed the 1A AFW train experienced a complete actuation and that the 1A AFW Pump and its associated valves functioned as designed. The pump was subsequently secured and the AFW system was returned to standby readiness. This event was entered into the site specific correction action program for resolution. The NRC Resident Inspector has been informed. The licensee will notify the states of North Carolina and South Carolina. Additionally the licensee will notify York, Gaston, and Mecklenburg County.
ENS 4858312 December 2012 19:57:00CatawbaNRC Region 2Westinghouse PWR 4-LoopWhile attempting to swap Technical Support Center (TSC) power supplies the TSC air handling unit circuit breaker tripped rendering the TSC unavailable for emergency assessment. An emergent work order has been planned to restore the TSC air handling unit to operational status. The licensee has notified the NRC Resident Inspector. Licensee also notified state, local and other government agencies.
ENS 4850212 November 2012 14:13:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis non-emergency event report is being made per 10CFR50.72(a)(1)(ii) which requires reporting events that occurred within three years of the date of discovery. Based on operating experience, Engineering personnel reviewed past maintenance activities involving the Technical Support Center (TSC) ventilation system (VH system) and identified 11 occasions between September 2009 and October 2012 (3 years) where the VH system functions could not have been restored within the required facility activation time. The specific instances have been documented in our corrective action program. If an emergency had been declared during these periods and TSC ERO activation was required, the TSC would have been staffed and activated unless the TSC became uninhabitable due to ambient temperatures, radiological or other conditions. If relocation of the TSC staff was necessary, the Station Emergency Coordinator would relocate the staff to an alternate TSC location. Practices and processes have been revised to improve control of TSC maintenance activities and to improve facility availability going forward. In addition, site reporting guidance has been revised to assure timely reporting of these types of events if required. This event is reportable per 10CFR50.72(b)(3)(xiii) as described in NUREG-1022, Rev. 2, since the maintenance activities affected an emergency response facility. The licensee will be notifying the NRC Resident Inspector and state and local authorities in North Carolina and South Carolina.
ENS 4834826 September 2012 22:27:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

Pressurizer Pressure LO Instrument surveillance testing was discovered to not have been completed as required. Existence of an internal jumper on solid state protection system input to logic cards prevented complete circuit testing. Unit 1 and unit 2 entered Technical Specification (TS) 3.0.3 at 1515 hours. Alternate method of surveillance testing on one of the trains was completed and TS 3.0.3 was exited on Unit 1 at 2203 EDT and Unit 2 at 2132 EDT. The licensee plans to complete surveillance testing on the second train before 1515 hours on 9/27/12. The licensee is currently in TS 3.3.2. The licensee has notified the NRC Resident Inspector. The states of North Carolina and South Carolina will be notified. Local county governments of York, Gaston, and Mecklenberg counties will also be notified.

  • * * RETRACTION AT 1652 EDT ON 10/04/12 FROM AARON MICHALSKI TO HUFFMAN * * *

Catawba nuclear station is retracting EN #48348 for both units 1 and 2 based on completion of testing and investigation of system operability. The testing determined that both units respective train 'A' and 'B' pressurizer pressure low were operable and would have functioned as needed. This condition is not reportable under 10 CFR 50.72(b)(3)(ii)(B) and 10 CFR 50.72(b)(3)(v)(D). The licensee has notified the NRC Resident Inspector. R2DO (O'Donohue) notified.

ENS 4830413 September 2012 13:08:00CatawbaNRC Region 2Westinghouse PWR 4-LoopOn 09/13/12 at 0740 (EDT) the TSC ventilation was determined to be non-functional. Investigation is underway to determine the cause of the ventilation failure and make the necessary repairs. While the TSC is unavailable, the Catawba Emergency Plan has provisions to relocate TSC personnel if required to the alternate TSC location. The licensee has notified the NRC Resident Inspector. The licensee will inform State and local agencies as a courtesy.
ENS 4829410 September 2012 21:30:00CatawbaNRC Region 2Westinghouse PWR 4-LoopOn 9-11-12 the Technical Support System (TSC) ventilation will be removed from service for a planned maintenance activity. The ventilation system will be out of service for approximately 9 hours. During this time the TSC will be unavailable should an event involving a radiological release occur. The Catawba Emergency Plan has provisions to relocate TSC personnel if required to the alternate TSC location. The licensee will inform State and local agencies as a courtesy and the NRC Resident Inspector.
ENS 482672 September 2012 09:21:00CatawbaNRC Region 2Westinghouse PWR 4-LoopAs part of preparation for the upcoming Democratic National Convention (DNC), contingencies are in place associated with the common Emergency Operations Facility (EOF) for Catawba, McGuire, and Oconee Nuclear Stations. The common EOF is located in Charlotte, NC. Because of the potential for event security to delay staffing of the facility within the prescribed time frame, Duke Energy is implementing its business continuity plan for the EOF during the period from 12:00 PM (noon) on September 2nd until 24:00 (midnight) on September 6th. If a declared emergency were to occur at Catawba Nuclear Station, the EOF would be set up in the McGuire Alternate Technical Support Center (TSC) location. This facility is used as a backup location for the McGuire TSC as specified in station procedures. This report is being made in accordance with 10CFR50.72, criterion (b)(3)(xiii), and in accordance with NUREG-1022, Revision 2, as a condition that may impair the functionality of an Emergency Response Facility. The licensee will notify the State of North Carolina, State of South Carolina, York County, Gaston County, and Mecklenburg County. The licensee has notified the NRC Resident Inspector.
ENS 4821320 August 2012 19:54:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThe control room received a 4911 notification (emergency on-site 911 call) regarding an employee illness where the employee was unresponsive. Site Medical Emergency Response Team responded, and requested offsite assistance via ambulance. The employee was transported to Piedmont Medical Center via ambulance where he was pronounced deceased. A notification to OSHA (Occupational Safety and Health Administration) was made at 1645 EDT on 8/20/12 due to the on-site fatality. The employee had gone to a meeting and feeling ill went to the break room on-site. When the on-site medical team arrived at the break room they were unsuccessful in resuscitating the employee. The licensee will be notifying the state and local agencies. The licensee has notified the NRC Resident Inspector.
ENS 4812624 July 2012 11:04:00CatawbaNRC Region 2Westinghouse PWR 4-LoopOn July 23, 2012, at 0508 EDT, the Technical Support Center (TSC) ventilation was tagged out for routine maintenance. It was believed that only the cooling function was affected and that the TSC ventilation system was still capable of performing its intended function of pressurization and filtration. A review by operations today determined that the TSC filtration and pressurization portion was also affected. Under certain accident conditions, the TSC may become unavailable due to the inability of the filtration system to maintain a habitable atmosphere. Compensatory measures exists to relocate the TSC to an alternate location. Currently it is expected that the TSC ventilation system maintenance will be completed by the end of the day shift today and turned over to operations. Operations should start up the system early during night shift (7/24). This is reportable to the NRC per 10 CFR 50.72 (b)(3)(xiii) as an eight hour non-emergency notification. The event had no effect on plant operations and no impact on public health and safety has been identified. The licensee will notify the NRC Resident Inspector, States and Counties.
ENS 480705 July 2012 14:06:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis is a non-emergency notification regarding an extremely small amount of Special Nuclear Material (SNM) which is unaccounted for. On 6/21/2012, it was determined that two nuclear instrumentation incore detectors could not be accounted for at Catawba. Detectors of this type are used to measure incore neutron flux (intensity of neutron radiation) inside the reactor vessel. This determination was made following the completion of a scheduled inventory of nuclear instrumentation incore detectors in storage. This is being reported under 10 CFR 20.2201(a)(1)(ii) (reports of theft or loss of licensed material). According to Catawba documentation, there should be 54 such detectors in storage. Only 52 detectors could be physically located on site. There is no evidence of theft or diversion of these detectors. According to site documentation, one or both of the detectors may have been shipped to Barnwell in 1986. Detectors of this type contain very small amounts of Uranium-235 (0.0041 grams/detector), which qualifies them as SNM. The most likely location for the detectors is either in one bunker located on site and within the radiological controlled area or at Barnwell via a low level radioactive waste shipment. The search for these detectors was suspended based on a determination that the additional dose to plant workers involved in the search was not justified by an equivalent offsetting safety benefit. It is unlikely that these detectors could have left the site other than in a radioactive waste shipment as the radiation monitoring equipment in place would likely have identified the presence of the detectors. This event had no effect on plant operations and no impact on public health and safety has been identified. A written report will be made in accordance with 10 CFR 20.2201(b)(1)(i-vi). The licensee will notify the NRC Resident Inspector. Usually, spent incore detectors are stored in a locked high radiation area at the facility. This was the first physical inventory of sources performed by the licensee. THIS MATERIAL EVENT CONTAINS A "LESS THAN CAT 3" LEVEL OF RADIOACTIVE MATERIAL Sources that are "Less than IAEA Category 3 sources," are either sources that are very unlikely to cause permanent injury to individuals or contain a very small amount of radioactive material that would not cause any permanent injury. Some of these sources, such as moisture density gauges or thickness gauges that are Category 4, the amount of unshielded radioactive material, if not safely managed or securely protected, could possibly - although it is unlikely - temporarily injure someone who handled it or were otherwise in contact with it, or who were close to it for a period of many weeks. For additional information go to http://www-pub.iaea.org/MTCD/publications/PDF/Pub1227_web.pdf This source is not amongst those sources or devices identified by the IAEA Code of Conduct for the Safety & Security of Radioactive Sources to be of concern from a radiological standpoint. Therefore is it being categorized as a less than Category 3 source
ENS 478054 April 2012 20:25:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

At 2003 EDT on 4/4/12 Catawba Unit 1 automatically tripped due to a loss of offsite power. The licensee declared a Notice of Unusual Event due to entry into EAL 4.5.U.1, 'AC Electrical Power from All Offsite Sources Has Been Lost for Greater Than 15 Minutes.' Power is still available from onsite sources. All four Emergency Diesel Generators (EDG) started and powered their respective safety buses. The EAL poses no threat to the safety of the public. The Unit 1 control rods fully inserted, there is no known primary to secondary leakage, and the auxiliary feedwater water system automatically started. The licensee notified the NRC Resident Inspector Notified: DHS SWO, FEMA, DHS NICC, USDA, HHS, DOE, EPA, and Nuclear SSA via email.

  • * * UPDATE AT 0150 EDT ON 04/05/12 FROM DARRYL HELTON TO S. SANDIN * * *

Catawba Nuclear Generating Station exited the Unusual Event at 0137 EDT after restoring offsite power at 0135 EDT to the Unit 1A and Unit 2B essential busses. The EDGs powering these busses have been secured and returned to Standby. The Unit 1B and Unit 2A essential busses remain energized by their respective EDGs. The licensee does not have an estimate as to when offsite power will be restored for these busses. Additional information provided as follow-up includes: 4-hour notification per 10CFR50.72(b)(2)(iv)(B) due to the Unit 1 Reactor Protection System (RPS) actuation (Rx Trip), 4-hour notification per 10CFR50.72(b)(2)(xi) for offsite notifications to the States of North and South Carolina and the counties of York, Gaston and Mecklenburg, 8-hour notification per 10CFR50.72(b)(3)iv)(A) due to the Unit 1 Rx Trip, Unit 1 Auxiliary Feedwater automatic start, Unit 1A and 1B and Unit 2A and 2B EDG auto starts. 8-hour notification per 10CFR50.72(b)(3)(v)(B) due to the loss of Residual Heat Removal (RHR) cooling on the initial loss of power. Unit 2 RHR was restored in less than three (3) minutes when the essential busses were re-energized by the EDGs. The licensee informed the NRC Resident Inspector. Notified R2IRC, EO (Nelson), IRD (Gott) and FEDS (DHS SWO, DOE Ops Center, FEMA, HHS Ops Center, DHS NICC, USDA Ops Center, EPA EOC) and NuclearSSA via email.

ENS 477952 April 2012 11:45:00CatawbaNRC Region 2Westinghouse PWR 4-LoopAt 0624 EDT on 04/02/2012 the control room was notified by a plant operator that there was a fire in the plant vital battery room area on Unit 2. The fire was located in the lower compartment of inverter 2KUI. This equipment supplies power to 120V AC non-safety related components. The fire brigade captain was dispatched along with the site fire brigade. When the fire brigade captain arrived the operator was staged near the inverter with a CO2 (carbon dioxide) fire extinguisher. The fire brigade captain instructed the NLO (non-licensed operator) to extinguish the fire with the extinguisher. The fire was immediately extinguished once the CO2 was applied from the extinguisher. At 0633 EDT the fire brigade captain reported to the control room that the fire was extinguished. Upon further investigation it appears that transformer in the lower compartment of the inverter had caught fire. The fire was confined to the lower compartment of the inverter and did not affect any other components in the area. Due to the loss of the inverter the loads automatically swapped to the alternate AC source as designed and no indications or equipment were lost due to the loss of the inverter. At the time of this event Unit 1 was at 100% power and Unit 2 was shutdown in Mode 6 with reactor coolant system drained to 8% level with 2B Residual Heat Removal pump supplying core cooling. There was no impact to either unit as a result of this event. All equipment required to maintain core cooling, AC and DC power, and reactor coolant inventory on Unit 2 was maintained during this event. The licensee notified the NRC Resident Inspector.
ENS 4778028 March 2012 12:55:00CatawbaNRC Region 2Westinghouse PWR 4-LoopPlanned maintenance activities are in progress on Catawba Nuclear Station's Technical Support Center (TSC) Emergency Ventilation System. These planned activities include replacement of a relay and relay base that render the ventilation system temporarily inoperable. The planned maintenance window is not expected to exceed 24 hours. This report is being made in accordance with 10CFR50.72, criterion (b)(3)(xiii), and in accordance with NUREG-1022, Revision 2, as a condition that may impair the functionality of an Emergency Response Facility. The licensee has notified the NRC Resident Inspector.
ENS 4769523 February 2012 14:28:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThe Technical Support Center will be unavailable for approximately 10 hours due to planned maintenance on motor control center SMXE. Maintenance is expected to begin at 0500 on February 24, 2012. The licensee will notify the NRC Resident Inspector.
ENS 4752515 December 2011 10:41:00CatawbaNRC Region 2Westinghouse PWR 4-LoopControl room area chilled water system 'B' train tripped while control room area chilled water system 'A' train was isolated for maintenance. Unit 1 and Unit 2 entered technical specification 3.0.3 at 0739 EST. Unit 1 shutdown commenced at 1030 EST. Unit 2 shutdown is scheduled to commence at 1100 EST. This plant condition also requires a notification under 10CFR50.72(b)(3)(v). The licensee is investigating the cause of the trip on the 'B' train and is taking actions to restore the 'A' train to service and exit the shutdown. The electrical lineup is normal and all safety systems are operable. The NRC Resident Inspector has been notified. The states of North Carolina and South Carolina will be notified. Local county governments of York, Gaston, and Mecklenberg counties will also be notified.
ENS 4684011 May 2011 07:30:00CatawbaNRC Region 2Westinghouse PWR 4-LoopGreater than 25% of the Catawba offsite Alert and Notification Sirens are unavailable due to severe thunderstorm related power outages in the area. As of approximately 0200 EDT, 40 of 89 sirens were unavailable. Power restoration efforts in the area are underway. As of 0730 EDT, 27 of the 89 sirens remain out of service. The licensee notified the State of North Carolina including Mecklenburg and Gaston Counties, and the State of South Carolina including York County. They also will be notifying the NRC Resident Inspector.
ENS 4678023 April 2011 12:37:00CatawbaNRC Region 2Westinghouse PWR 4-LoopAt 0921 (EDT) on 4/23/11, CNS Unit-1 received an auxiliary feedwater pump auto start due to low-low level in the 1B steam generator. The 1A auxiliary feedwater pump started and restored steam generator level to the normal operating band. A cooldown was in progress at the time of the event and the tagout isolated feedwater flow to the 1B steam generator. The licensee notified the NRC Resident Inspector. The states of North and South Carolina, and York, Gaston, and Mecklenburg Counties will be notified.
ENS 4667817 March 2011 13:58:00CatawbaNRC Region 2Westinghouse PWR 4-LoopVehicle fire outside the protected area in the owner controlled area. Offsite fire department contacted and responded to site. Fire has been extinguished. Fire was limited to vehicle and no plant equipment was affected. Event had no affect on plant operation. The licensee notified the State of North Carolina, the State of South Carolina, York county, Gaston county, and Mecklenburg county. The licensee notified the NRC Resident Inspector.
ENS 4593820 May 2010 17:11:00CatawbaNRC Region 2Westinghouse PWR 4-LoopNotification (was made) to make the NRC aware of a call to Bethel Fire Department for assistance in extinguishing a grass fire on Catawba property. The fire was caused by an arc flash, resulting from a large bird coming in contact with a York cooperative power line. (The) fire is extinguished. Fire was outside the owner controlled area. (The area burned) is approximately 100' x 100'. (There was) no property damage (to the site). Both units were unaffected by this event and maintained 100% reactor power. The fire was located in a brush field located in Catawba Park and took approximately 30 minutes to distinguish. The licensee notified the NRC Resident Inspector. The licensee also notified Mecklenburg, Gaston, and York counties as well as the state of North Carolina and South Carolina.
ENS 4571018 February 2010 19:42:00CatawbaNRC Region 2Westinghouse PWR 4-LoopCatawba Nuclear Station is making an 8 hour notification due to a pressure boundary leak on the A loop of the Unit 1 Reactor Coolant System. The leak was found to be originating from 1A Reactor Coolant System hot leg (Resistance Temperature Detector) RTD penetration. Since the allowance for pressure boundary leakage is zero, this is being considered a degraded principal safety barrier. No safety signals were received and no actuations occurred as a result of this leak. The amount of the leak is small and is contained inside containment. No release to the environment occurred and there is no danger to the public. Repair will require the plant to enter Mode 5. The pressure boundary leakage is 0.08 GPM. The licensee is in a 36 hour LCO 3.4.13(B)(2), and plans to be in Mode 5 this evening. The licensee has notified the NRC Resident Inspector.
ENS 451918 July 2009 23:25:00CatawbaNRC Region 2Westinghouse PWR 4-LoopA non-contaminated individual was transported by ambulance from the Catawba Nuclear Station parking lot to a local hospital due to a personal illness. The individual was pronounced dead at the hospital. Catawba Nuclear Station is notifying (Occupation Safety Health Administration) OSHA of an on-site fatality. Licensee has notified the NRC Resident Inspector.
ENS 4514218 June 2009 19:26:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

On June 17, 2009, Catawba prepared a radioactive waste shipment cask for transportation to the Barnwell low level waste disposal facility. The shipment consisted of miscellaneous spent filters and the shipment was made on the same day. On June 18, 2009, Catawba discovered that all of the required conditions of approval in the Certificate of Compliance for the shipping container were not observed in making the shipment. Specifically, Catawba failed to conduct all of the required leak rate tests for the container prior to shipment. According to procedure, leak rate tests of the container's primary lid, secondary lid, and vent line are required to be performed. Contrary to this requirement, leak rate tests of the secondary lid and vent line were not performed. This event will require a written report to the NRC within 60 days pursuant to 10 CFR 71.95(c). Catawba is making this ENS notification as a courtesy notification. There is no requirement for Catawba to notify any government agency of this event. However, the State of South Carolina Department of Health and Environmental Control (SC DHEC) will ultimately be made aware of this event by Energy Solutions at Barnwell. There is no evidence that the affected shipping container has actually leaked or is leaking. The secondary lid and vent line were successfully leak rate tested at Barnwell following notification and a request by Catawba management on June 18, 2009. Catawba has notified the NRC Senior Resident Inspector of this event.

  • * * UPDATE FROM WAYNE JARMAN TO JOE O'HARA AT 1442 ON 6/19/09 * * *

The licensee intends to notify the state warning point as well as York, Gaston, and Mecklenburg Counties. Notified the R2DO(Bartley).

ENS 451081 June 2009 10:07:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

On 04/22/09 Whole Effluent Toxicity test for Outfall 002 failed. South Carolina Department of Health and Environmental Control has been notified. Follow-up testing was completed and passed by the licensee.

No media release is expected from this event. The licensee has notified the NRC Resident Inspector, and will be notifying the States of North Carolina and South Carolina.

ENS 4509326 May 2009 13:56:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThe quarterly National Pollutant Discharge Elimination System whole effluent toxicity testing for Outfall #001 failed for the 2nd quarter of 2009. This required notification to the South Carolina Environmental Agency. The system is the Low Pressure Service Water (RL) discharge. The licensee will be contacting the NRC Resident Inspector. A toxicity evaluation is being performed by an outside lab. In addition to South Carolina, the licensee notified the State of North Carolina and York, Gaston, and Mecklenburg counties.
ENS 4494430 March 2009 09:35:00CatawbaNRC Region 2Westinghouse PWR 4-Loop

A licensee employee, working in the Outage Command Center (office environment), which is located inside the Protected Area, had symptoms of a heart attack. On-site emergency personnel responded and the individual was transported off-site to Piedmont Medical Center. Piedmont Medical Center notified the licensee at 0445 hours that the heart attack was fatal. The licensee notified OSHA. The licensee does not plan to make a media or press release. The licensee notified the NRC Resident Inspector.

  • * * UPDATE AT 1453 EDT ON 03/30/09 FROM STEVE CHRISTOPHER TO S. SANDIN * * *

This notification is being made to supplement today's 0935 (EDT) notification. The offsite notification to OSHA occurred at 0847 (EDT), placing the 0935 (EDT) notification to the NRC within the 4 hours required by 10 CFR 50.72 (b)(2). The licensee informed state/local agencies and the NRC Resident Inspector. Notified R2DO (Vias).

ENS 444582 September 2008 17:55:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThe quarterly National Pollutant Discharge Elimination System whole effluent toxicity testing for outfall #002 failed for August 2008. This required notification to the South Carolina Environmental Agency. The system is the Conventional Waste (WC) system. The licensee will be contacting the NRC Resident Inspector. A toxicity report is being performed by an outside lab." The licensee took a water flea controlled sample and determined that the water flea reproduction rate in the sample is not the same as the rate in the discharge stream. The licensee will also inform York County, Gaston County, Mecklenberg County, and the State of North Carolina.
ENS 4441113 August 2008 17:17:00CatawbaNRC Region 2Westinghouse PWR 4-LoopNotification to SCDHEC (South Carolina Department of Health and Environmental Controls) and the National Response Center (# 880488) due to a release of approximately 0.5 gallons of hydraulic fluid to Lake Wylie Discharge Canal from a hydraulic line failure on a piece of equipment. The hydraulic fluid reached Lake Wylie via yard drain. The fluid reaching Lake Wylie was contained by oil booms in place in the discharge canal. The licensee will notify the NRC Resident Inspector.
ENS 443947 August 2008 19:21:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThe quarterly National Pollutant Discharge Elimination System whole effluent toxicity testing for outfall #002 failed for July 2008. This required notification to the South Carolina Environmental Agency." The system was the Conventional Waste (WC). The licensee will be notifying the NRC Resident Inspector.
ENS 4435217 July 2008 10:48:00CatawbaNRC Region 2Westinghouse PWR 4-LoopThis 60-day optional report, as allowed by 10 CFR 50.73 (a)(1), is being made under the reporting requirement in 10 CFR 50.73 (a)(2)(iv)(A) to describe an invalid actuation of a specified system, specifically the Main Steam (SM) System. On June 9, 2008, at 1631 with Unit 1 in Mode 5, an invalid signal was generated on Train B of the SM system during Engineered Safety Features testing. During the performance of returning the Solid State Protection System (SSPS) to 'normal', the SSPSB mode selector switch was placed to operate. A Unit 1 Feedwater and Main Steam isolation occurred. Part of the 'return to normal' sequence is to place the SSPS Input Error Inhibit switch to the inhibit position. The technician failed to insure the inhibit switch 'snapped' into position and trip signals were generated when the Output Test relay switch was placed to Operate. The SM system was returned to standby readiness. This was considered a partial system/train actuation. During this event, the SM system performed as expected. This event was entered into the site specific corrective action program for resolution. The licensee has notified the NRC Resident Inspector, and will be notifying the State, local and other government agencies.