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On May 22, 2011, at 1444 hours, the Fermi … On May 22, 2011, at 1444 hours, the Fermi 2 Control Room was notified by the Central System Supervisor that the switchyard voltage for both the 345kV (Division II) and 120kV (Division I) offsite power circuits following a generator trip would not be sufficient to sustain operability of the safety-related loads. Technical Specification (TS) 3.8.1 'AC-Sources Operating,' Condition E was entered at 1444 hours. At 1535, both offsite power circuit voltages were at acceptable levels and the offsite circuits were declared operable. Technical Specification (TS) 3.8.1, Condition E was exited at 1535 hours. Abnormal Operating Procedure (AOP) 20.300 GRID was entered. The Emergency Diesel Generators (EDG) remained operable during the degraded voltage condition. The ability of the EDGs to fulfill their design function was not affected by this condition.</br>The event is being reported per 50.72(b)(3)(V)(A), as any event or condition that at the time of discovery could have prevented fulfillment of the safety function of structures or systems that are needed to shutdown the reactor and maintain it in a safe shutdown condition.</br>The NRC Resident Inspector was notified.</br>* * * RETRACTION FROM JEFF GROFF TO HOWIE CROUCH AT 1458 EDT ON 6/7/2011 * * *</br>This event is retracted. The original report was based on calculated unit trip voltage drop results reported to Detroit Edison by ITC Transmission Company that exceeded acceptance criteria. ITC has subsequently informed Fermi 2 that this notification was in error due to a software feature of their real time contingency analyzer that resulted in inappropriately high results. Based on the results of other similar real time contingency analyzers employed at that time, without the problematic software feature, none of the acceptance criteria were exceeded and both divisions of offsite power were capable of supporting operability of safety-related loads. Additionally, Fermi 2 has determined that even at the inappropriately high voltage drop originally reported, the Division II system could have performed its safety related functions. Therefore, there was no loss of safety function.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Lara). Resident Inspector. Notified R3DO (Lara).
18:44:00, 22 May 2011 +
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18:44:00, 22 May 2011 +
On May 22, 2011, at 1444 hours, the Fermi … On May 22, 2011, at 1444 hours, the Fermi 2 Control Room was notified by the Central System Supervisor that the switchyard voltage for both the 345kV (Division II) and 120kV (Division I) offsite power circuits following a generator trip would not be sufficient to sustain operability of the safety-related loads. Technical Specification (TS) 3.8.1 'AC-Sources Operating,' Condition E was entered at 1444 hours. At 1535, both offsite power circuit voltages were at acceptable levels and the offsite circuits were declared operable. Technical Specification (TS) 3.8.1, Condition E was exited at 1535 hours. Abnormal Operating Procedure (AOP) 20.300 GRID was entered. The Emergency Diesel Generators (EDG) remained operable during the degraded voltage condition. The ability of the EDGs to fulfill their design function was not affected by this condition.</br>The event is being reported per 50.72(b)(3)(V)(A), as any event or condition that at the time of discovery could have prevented fulfillment of the safety function of structures or systems that are needed to shutdown the reactor and maintain it in a safe shutdown condition.</br>The NRC Resident Inspector was notified.</br>* * * RETRACTION FROM JEFF GROFF TO HOWIE CROUCH AT 1458 EDT ON 6/7/2011 * * *</br>This event is retracted. The original report was based on calculated unit trip voltage drop results reported to Detroit Edison by ITC Transmission Company that exceeded acceptance criteria. ITC has subsequently informed Fermi 2 that this notification was in error due to a software feature of their real time contingency analyzer that resulted in inappropriately high results. Based on the results of other similar real time contingency analyzers employed at that time, without the problematic software feature, none of the acceptance criteria were exceeded and both divisions of offsite power were capable of supporting operability of safety-related loads. Additionally, Fermi 2 has determined that even at the inappropriately high voltage drop originally reported, the Division II system could have performed its safety related functions. Therefore, there was no loss of safety function.</br>The licensee has notified the NRC Resident Inspector. Notified R3DO (Lara). Resident Inspector. Notified R3DO (Lara).
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