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| Entered date | Event description | |
|---|---|---|
| ENS 51212 | 8 July 2015 17:43:00 | 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) as the discovered condition affects the functionality of an emergency response facility. A condition impacting functionality of the TSC Ventilation system was discovered on July 7, 2015 at 11:05 EDT. The issue involved a loss of cooling capability of the TSC Ventilation system due to failed ventilation system components. Maintenance started repairs immediately following the discovery of the component failures and completed repairs to restore functionality of the TSC Ventilation system on July 8, 2015 at 17:07 EDT. On July 8, 2015, at approximately 15:30 EDT, further review of the impact of this equipment failure determined that this condition was reportable as a loss of emergency assessment capability. If an emergency were declared requiring TSC activation during the non-functional period, the TSC would have been staffed and activated using existing emergency planning procedures unless the TSC became uninhabitable due to ambient temperature, radiological, or other conditions. If relocation of the TSC became necessary, the Emergency Director would have relocated the TSC staff to an alternate location in accordance with applicable site procedures. The Emergency Response Organization team was notified of the maintenance and the possible need to relocate during an emergency. This condition did not affect the health and safety of the public or station employees. The NRC Resident Inspector has been notified.
An extent of condition review revealed three additional instances of loss of cooling capability of the Technical Support Center due to failed ventilation system components: January 7, 2015; June 20, 2015; and June 30, 2015. Functionality was restored after these conditions were identified. Each of these instances was determined to be reportable in accordance with 10 CFR 50.72(b)(3)(xiii). The NRC Resident Inspectors have been notified. Notified R2DO (Rose). |
| ENS 51178 | 24 June 2015 19:29:00 | On June 16, 2015 at 1145 EDT while in Mode 1 at 100% power steady-state conditions, two fire doors between the Reactor Auxiliary building (RAB) and steam tunnel were opened under administrative controls to support maintenance. These doors are credited in high energy line break equipment qualification and internal flooding analyses and opening of the doors is not addressed in the analyses. A high energy line break in the steam tunnel with the doors open could result in equipment in the RAB experiencing high temperature, pressure, or humidity beyond conditions analyzed for equipment qualification which has the potential to render redundant safety-related equipment inoperable. The event was determined to be reportable on June 24, 2015 at approximately 1550 (EDT). During that reportability evaluation, it was determined that the doors may have been in a similar condition multiple times in the May-June time frame. This condition is reportable in accordance with 10 CFR 50.72(b)(3)(ii)(B) as an unanalyzed condition and in accordance with 10 CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of the safety function of structures or system that are needed to mitigate the consequences of an accident. There was no adverse impact to public health and safety or to plant employees. The NRC Resident Inspector has been notified. |
| ENS 49076 | 29 May 2013 09:59:00 | Loss of one of two National Weather Service (NOAA) Tone Alert Radio Transmitters. This is a non-emergency notification. At 09:34 AM EDT on May 29, 2013, the National Weather Service reported that they plan to remove the National Weather Service (NOAA) Tone Alert Radio Transmitter, WXL-58 located in Chapel Hill, NC., serving the northeast piedmont on 162.550 MHZ, from service for maintenance. The maintenance is expected to last 4 hours. The purpose of the National Weather Service (NOAA) Tone Alert Radio transmitters is a redundant means to the 83 Harris Nuclear Plant Emergency Sirens to warn the public within the 5 mile radius of the plant of an actual event. The 83 Harris Nuclear Plant Emergency Sirens are in service and fully functional to alert the public within the 5 mile radius of the plant of an actual event should an event occur. Compensatory Measure is in place as a back-up route alert to the public within the 5 miles radius (affected counties; Wake, Chatham, Harnett) upon declaration of an event. There is no impact to public health and safety due to this condition. The NRC Resident has been notified. This is the same NOAA Tone Alert Radio Transmitter as reported in NRC Event #49074.
The NOAA Tone Alert Radio Transmitter was returned to service on 5/29/13 at 1538 EDT. The licensee will notify the NRC Resident Inspector. Notified the R2DO (Bonser). |
| ENS 49074 | 28 May 2013 11:36:00 | Loss of one of two National Weather Service (NOAA) Tone Alert Radio Transmitters. This is a non-emergency notification. At 10:52 AM EDT on May 28, 2013, the National Weather Service reported that they plan to remove the National Weather Service (NOAA) Tone Alert Radio Transmitter, WXL-58 located in Chapel Hill, NC., serving the northeast piedmont on 162.550 MHZ, from service maintenance. The maintenance is expected to last 4 hours. The purpose of the National Weather Service (NOAA) Tone Alert Radio transmitters is a redundant means to the 83 Harris Nuclear Plant Emergency Sirens to warn the public within the 5 mile radius of the plant of an actual event. The 83 Harris Nuclear Plant Emergency Sirens are in service and fully functional to alert the public within the 5 mile radius of the plant of an actual event should an event occur. There is no impact to public health and safety due to this condition. The NRC Resident has been notified.
At 1415 EDT on 5/28/13 the Tone Alert Radio Transmitter WXL-58 was returned to service. The licensee will notify the NRC Resident Inspector. Notified R2DO (Bonser). |
| ENS 49004 | 6 May 2013 13:34:00 | At 10:16 AM EDT on May 6, 2013, the National Weather Service (NWS-NOAA) reported a loss of the (NWS-NOAA) Tone Alert Radio Transmitter, WXL-58 located in Chapel Hill, North Carolina, which serves the Northeast Piedmont on 162.550 MHZ. The NWS-NOAA does not have an expected return to service time. The NWS-NOAA Tone Alert Radio Transmitters are in place to provide a redundant means to alert residents within five miles to an emergency at the plant. Eighty-three Alert and Notification System (ANS) sirens are located throughout the ten mile radius of the plant. The ANS sirens have the same function as the Tone Alert Radios, but extend out to ten miles. All ANS sirens are currently in service and fully functional. Therefore, there is a means to alert the public within the 10 mile radius of the plant if an actual emergency were to occur. There is no impact to public health and safety due to this condition. The NRC Resident Inspector has been notified." This report was also made per a requirement of licensee procedure PLP-201. |