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On 12/15/10 at 0148 (CST) Control room per … On 12/15/10 at 0148 (CST) Control room personnel initiated a manual reactor trip in order to abort a startup in progress with the Unit 2 Reactor subcritical.</br>During the performance of OP-1B, Reactor Startup for Unit 2 both Rod Control System Urgent and Non-Urgent alarms were received. Shortly after receiving the alarms multiple groups of control rods fell into the core as indicated by Individual Rod Position Indicators (IRPl's) and rod bottom lights. Based on these indications a manual reactor trip was initiated. All systems functioned as expected, with all control rods fully inserting. The plant is currently in Mode 3 and operating in accordance with normal plant procedures.</br>The cause of the control rod alarms is under investigation.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector. +
07:48:00, 15 December 2010 +
46,482 +
05:40:00, 15 December 2010 +
07:48:00, 15 December 2010 +
On 12/15/10 at 0148 (CST) Control room per … On 12/15/10 at 0148 (CST) Control room personnel initiated a manual reactor trip in order to abort a startup in progress with the Unit 2 Reactor subcritical.</br>During the performance of OP-1B, Reactor Startup for Unit 2 both Rod Control System Urgent and Non-Urgent alarms were received. Shortly after receiving the alarms multiple groups of control rods fell into the core as indicated by Individual Rod Position Indicators (IRPl's) and rod bottom lights. Based on these indications a manual reactor trip was initiated. All systems functioned as expected, with all control rods fully inserting. The plant is currently in Mode 3 and operating in accordance with normal plant procedures.</br>The cause of the control rod alarms is under investigation.</br>The licensee informed the NRC Resident Inspector.ensee informed the NRC Resident Inspector. +
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00:00:00, 15 December 2010 +
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