Browse wiki
Jump to navigation
Jump to search
At 06:45 EST on 3/2/2015, Sequoyah Unit 2 … At 06:45 EST on 3/2/2015, Sequoyah Unit 2 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 2 is currently being maintained in Mode 3 at NOT/NOP (normal operating temperature and pressure), approximately 548 F and 2235 psig, with auxiliary feedwater supplying decay heat removal via the steam generators and condenser steam dumps.</br>The immediate cause of the trip was a main generator C phase differential relay actuation. There was no associated work in progress related to this and all systems were normally aligned. It is currently not understood why the relay actuated.</br>Current Temperature and Pressure - temperature is 548 degrees F and stable, pressure is 2235 psig and stable. There is no indication of any primary/secondary leakage. All rods are inserted. Electrical alignment is normal, supplied from Off-Site power. The 2B Emergency Diesel Generator is currently unavailable for planned maintenance and will be returned to service prior to unit restart. There is no operational impact to Unit 1. Unit 1 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" and the state.</br>No primary or secondary safety valves lifted during this event.ry safety valves lifted during this event. +
11:45:00, 2 March 2015 +
10:22:00, 2 March 2015 +
11:45:00, 2 March 2015 +
At 06:45 EST on 3/2/2015, Sequoyah Unit 2 … At 06:45 EST on 3/2/2015, Sequoyah Unit 2 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 2 is currently being maintained in Mode 3 at NOT/NOP (normal operating temperature and pressure), approximately 548 F and 2235 psig, with auxiliary feedwater supplying decay heat removal via the steam generators and condenser steam dumps.</br>The immediate cause of the trip was a main generator C phase differential relay actuation. There was no associated work in progress related to this and all systems were normally aligned. It is currently not understood why the relay actuated.</br>Current Temperature and Pressure - temperature is 548 degrees F and stable, pressure is 2235 psig and stable. There is no indication of any primary/secondary leakage. All rods are inserted. Electrical alignment is normal, supplied from Off-Site power. The 2B Emergency Diesel Generator is currently unavailable for planned maintenance and will be returned to service prior to unit restart. There is no operational impact to Unit 1. Unit 1 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" and the state.</br>No primary or secondary safety valves lifted during this event.ry safety valves lifted during this event. +
Has query"Has query" is a predefined property that represents meta information (in form of a <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Subobject">subobject</a>) about individual queries and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
100 +
00:00:00, 2 March 2015 +
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>.
22:18:18, 24 September 2017 +
10:22:00, 2 March 2015 +
true +
-0.0575 d (-1.38 hours, -0.00821 weeks, -0.00189 months) +
11:45:00, 2 March 2015 +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.