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| Entered date | Event description | |
|---|---|---|
| ENS 48276 | 5 September 2012 10:54:00 | This (report) is being issued in advance of a planned activity. Today, 9/5/2012, the (TSC) Technical Support Center Emergency Ventilation System will be removed from service to support preventative maintenance activities. The Emergency Ventilation System will not be available and cannot be restored within the time period (75 minutes) required to staff and activate the Emergency Response Organization (ERO). This work is scheduled to complete today. If an emergency is declared and the TSC ERO activation is required, the TSC will be staffed and activated unless the TSC becomes uninhabitable due to ambient temperature, radiological conditions, or other conditions. If relocation of the TSC staff becomes necessary, the Station Emergency Director will relocate the staff to an alternate TSC location. The licensee has notified the NRC Resident Inspector. |
| ENS 44869 | 23 February 2009 05:46:00 | The Turbine Driven Auxiliary/Emergency Feedwater pump auto started when power was lost to the steam admittance solenoid valves. Additional feedwater to the steam generators caused an increase in power; in response, turbine load was manually decreased. At no time were any power limits exceeded. Power level is currently at 87% and stable. Maximum power, as determined by core delta temperatures, did not exceed 100%. The licensee has notified the NRC Resident Inspector.
Event Report 44869 Retraction: On February 23, 2009, McGuire Nuclear Station notified the NRC of an inadvertent actuation of the Unit 1 Turbine Driven Auxiliary/Emergency Feedwater (TDAFW) Pump (reference Event Report 44869). This event occurred when power was removed to the steam admittance solenoid valves for the Unit 1 TDAFW Pump prior to isolating the steam supply to the pump. Removing power to the steam admittance valves caused them to fail open, starting the pump. As per the requirements of 10 CFR 50.72(b)(3)(iv)(A), this event was reported as a valid actuation of the Unit 1 TDAFW Pump. Further evaluation of the event concluded that the actuation of the Unit 1 TDAFW Pump was not the result of a valid signal initiated in response to actual plant conditions or parameters satisfying the requirements for initiation of the safety function provided by the pump. In addition, the actuation of the Unit 1 TDAFW Pump was not the result of an intentional manual initiation. Therefore, actuation of the Unit 1 TDAFW Pump represented an invalid actuation which is not reportable per the requirements of 10 CFR 50.72(b)(3)(iv)(A). Therefore, McGuire is retracting Event Report 44869. Note that McGuire will report this event in accordance with the requirements of 10 CFR 50.73. The licensee has notified the Resident Inspector. Notified R2DO (Musser). |
| ENS 44618 | 31 October 2008 13:45:00 | Initial conditions: Low Power Physics Testing after outage. Performing Dynamic Rod Worth measurements. Single dropped rod (K-2) on Control Bank B occurred after movement disagreement between rod groups. Entered AP-14, 'Rod Control Malfunction'. Performed a manual reactor trip and manual start of Auxiliary Feedwater as directed by Normal Operating Procedures for unit shutdown. Feedwater isolation occurred due to Low T-Ave concurrent with reactor trip. All control rods were fully inserted. Licensee has notified NRC Resident Inspector. |
| ENS 44339 | 7 July 2008 16:54:00 | Alert Notification sirens (60 of 67) failed to operate properly and therefore required licensee to report this per 10 CFR 50.72(b)(3)(xiii). All Emergency Planning Zone counties have been notified and placed on backup route alerting, which means notification will be performed by local authorities. Investigation of this matter is ongoing. Licensee has notified NRC Resident Inspector.
A bad radio in the test shop created interference with the Alert Notification sirens, thus preventing them from operating properly. At 1425 EDT all Emergency Planning Zone counties were notified and the backup route alerting was cancelled. The sirens were tested satisfactorily multiple times. Licensee has notified NRC Resident Inspector. Notified R2DO (Guthrie)
Telecom investigation revealed that all 67 ANS sirens were in fact available and ANS siren failure did not occur. The polling feature of the ANS sirens feedback signal experienced radio interference from a standby radio. This interference in the feedback system of the radio/siren system did not interfere with the activation of the sirens. The ANS sirens were fully functional and available during this time, therefore notification 44339 is being retracted. The licensee notified the NRC Resident Inspector. Notified R2DO (Payne) |