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At 1043 EDT on 7/27/2015, Sequoyah Unit 1 … At 1043 EDT on 7/27/2015, Sequoyah Unit 1 was at 82% power and continuing to perform a startup when the 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 (normal operating temperature and normal operating pressure), approximately 545 F and 2235 psig, with auxiliary feedwater supplying the steam generators and decay heat removal via the condenser steam dumps.</br>The immediate cause of the trip was an electrically-induced turbine trip. Due to fluctuating voltage the main generator voltage regulator was taken to manual; immediately after this the unit tripped.</br>Current Temperature and Pressure - Reactor Coolant System (RCS) temperature is 545 degrees F and stable and RCS pressure is 2235 psig and stable. 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. 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.ensee notified the NRC Resident Inspector. +
14:43:00, 27 July 2015 +
13:44:00, 27 July 2015 +
14:43:00, 27 July 2015 +
At 1043 EDT on 7/27/2015, Sequoyah Unit 1 … At 1043 EDT on 7/27/2015, Sequoyah Unit 1 was at 82% power and continuing to perform a startup when the 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 (normal operating temperature and normal operating pressure), approximately 545 F and 2235 psig, with auxiliary feedwater supplying the steam generators and decay heat removal via the condenser steam dumps.</br>The immediate cause of the trip was an electrically-induced turbine trip. Due to fluctuating voltage the main generator voltage regulator was taken to manual; immediately after this the unit tripped.</br>Current Temperature and Pressure - Reactor Coolant System (RCS) temperature is 545 degrees F and stable and RCS pressure is 2235 psig and stable. 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. 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.ensee notified the NRC Resident Inspector. +
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Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
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