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At 1351 EDT on 7/24/2015, Sequoyah Unit 1 … At 1351 EDT on 7/24/2015, Sequoyah Unit 1 reactor/turbine automatically tripped.</br>Following the reactor trip, all safety-related equipment operated as designed. Auxiliary Feedwater automatically initiated as expected from the Feedwater Isolation Signal.</br>Unit 1 is currently being maintained in Mode 3 at NOT/NOP, approximately 548 F and 2235 psig, with auxiliary feedwater supplying the steam generators and decay heat removal via the condenser steam dumps. The immediate cause of the trip was an electrically-induced turbine trip. There was no associated work in progress related to this and all systems were normally aligned.</br>There is no indication of any primary/secondary leakage. All rods fully inserted on the reactor trip and remain inserted. The electrical alignment is normal with shutdown power supplied from off-site power. The 2B-B Emergency Diesel Generator is currently in service for the performance of an unrelated surveillance. There is no operational impact to Unit 2. Unit 2 continues to operate in Mode 1 at 100%.</br>There was no impact on public health and safety. Post-trip investigation is in progress and planned restart timeline has not yet been determined.</br>The licensee notified the NRC Resident Inspector.</br>The cause of the main generator lockout is under investigation. generator lockout is under investigation. +
17:51:00, 24 July 2015 +
51,259 +
17:04:00, 24 July 2015 +
17:51:00, 24 July 2015 +
At 1351 EDT on 7/24/2015, Sequoyah Unit 1 … At 1351 EDT on 7/24/2015, Sequoyah Unit 1 reactor/turbine automatically tripped.</br>Following the reactor trip, all safety-related equipment operated as designed. Auxiliary Feedwater automatically initiated as expected from the Feedwater Isolation Signal.</br>Unit 1 is currently being maintained in Mode 3 at NOT/NOP, approximately 548 F and 2235 psig, with auxiliary feedwater supplying the steam generators and decay heat removal via the condenser steam dumps. The immediate cause of the trip was an electrically-induced turbine trip. There was no associated work in progress related to this and all systems were normally aligned.</br>There is no indication of any primary/secondary leakage. All rods fully inserted on the reactor trip and remain inserted. The electrical alignment is normal with shutdown power supplied from off-site power. The 2B-B Emergency Diesel Generator is currently in service for the performance of an unrelated surveillance. There is no operational impact to Unit 2. Unit 2 continues to operate in Mode 1 at 100%.</br>There was no impact on public health and safety. Post-trip investigation is in progress and planned restart timeline has not yet been determined.</br>The licensee notified the NRC Resident Inspector.</br>The cause of the main generator lockout is under investigation. generator lockout is under investigation. +
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