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At 1918 CST on February 1st 2011, LaSalle … At 1918 CST on February 1st 2011, LaSalle Unit 1 automatically scrammed due to a MPT (Main Power Transformer) trip and subsequent load reject, both RFP (Reactor Feed Pumps) tripped and (the reactor) scrammed on TCV (Throttle Control Valve) fast closure. 'U' safety relief valve actuated in the relief mode on the turbine trip and has subsequently reset with tailpipe temp returning to normal. As a result of the electrical transient, U1 and U2 RWCU (Reactor Water Cleanup) isolated, and this is not reportable due to being a single train system and there was no isolation in multiple systems. The plant is stable with reactor pressure control to the main condenser via the main steam isolation valves. Unit 2 remained at 96% in coastdown throughout the event. The plant is planned to remain in hot shutdown pending investigation of the cause of the MPT trip and load reject.</br>All control rods fully inserted on the reactor scram. The cause of the RFP trips was swelling of the reactor water level as expected after a scram. The first out alarm was "turbine control valve fast closure." The plant is experiencing severe weather which may have influenced the MPT trip.</br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
01:18:00, 2 February 2011 +
22:54:00, 1 February 2011 +
01:18:00, 2 February 2011 +
At 1918 CST on February 1st 2011, LaSalle … At 1918 CST on February 1st 2011, LaSalle Unit 1 automatically scrammed due to a MPT (Main Power Transformer) trip and subsequent load reject, both RFP (Reactor Feed Pumps) tripped and (the reactor) scrammed on TCV (Throttle Control Valve) fast closure. 'U' safety relief valve actuated in the relief mode on the turbine trip and has subsequently reset with tailpipe temp returning to normal. As a result of the electrical transient, U1 and U2 RWCU (Reactor Water Cleanup) isolated, and this is not reportable due to being a single train system and there was no isolation in multiple systems. The plant is stable with reactor pressure control to the main condenser via the main steam isolation valves. Unit 2 remained at 96% in coastdown throughout the event. The plant is planned to remain in hot shutdown pending investigation of the cause of the MPT trip and load reject.</br>All control rods fully inserted on the reactor scram. The cause of the RFP trips was swelling of the reactor water level as expected after a scram. The first out alarm was "turbine control valve fast closure." The plant is experiencing severe weather which may have influenced the MPT trip.</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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