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On August 6, 2011, at approximately 1119 M … On August 6, 2011, at approximately 1119 MST, the Palo Verde Unit 1 reactor tripped from approximately 100% rated thermal power due to a valid Reactor Protection System (RPS) actuation. The actuation was caused by a dropped Shutdown Group Control Element Assembly (CEA) during surveillance testing to exercise the CEAs. Following the reactor trip, one Regulating Group CEA indicated a failure to insert, however the CEA subsequently indicated fully inserted with no additional operator actions approximately 2 minutes after the trip. All CEAs are currently inserted fully into the reactor core. With the exception of the delayed indication of one CEA to fully insert, this was an uncomplicated reactor trip. No emergency classification was required per the Palo Verde Emergency Plan. No automatic or manual ESF actuations occurred and none were required. Safety related electrical buses remained energized during and following the reactor trip. The Emergency Diesel Generators did not start and were not required. The offsite power grid is stable. No major equipment was inoperable prior to the event that contributed to the event.</br>Unit 1 is stable at normal operating temperature and pressure in Mode 3." </br>Decay heat is being removed via the steam generators to the main condenser using the turbine bypass valves. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
18:19:00, 6 August 2011 +
47,133 +
17:41:00, 6 August 2011 +
18:19:00, 6 August 2011 +
On August 6, 2011, at approximately 1119 M … On August 6, 2011, at approximately 1119 MST, the Palo Verde Unit 1 reactor tripped from approximately 100% rated thermal power due to a valid Reactor Protection System (RPS) actuation. The actuation was caused by a dropped Shutdown Group Control Element Assembly (CEA) during surveillance testing to exercise the CEAs. Following the reactor trip, one Regulating Group CEA indicated a failure to insert, however the CEA subsequently indicated fully inserted with no additional operator actions approximately 2 minutes after the trip. All CEAs are currently inserted fully into the reactor core. With the exception of the delayed indication of one CEA to fully insert, this was an uncomplicated reactor trip. No emergency classification was required per the Palo Verde Emergency Plan. No automatic or manual ESF actuations occurred and none were required. Safety related electrical buses remained energized during and following the reactor trip. The Emergency Diesel Generators did not start and were not required. The offsite power grid is stable. No major equipment was inoperable prior to the event that contributed to the event.</br>Unit 1 is stable at normal operating temperature and pressure in Mode 3." </br>Decay heat is being removed via the steam generators to the main condenser using the turbine bypass valves. </br>The licensee notified the NRC Resident Inspector.ensee notified the NRC Resident Inspector. +
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