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On Thursday, January 10, 2013 at 1534 hour … On Thursday, January 10, 2013 at 1534 hour (EST), with the reactor at 100% core thermal power, both recirculation pumps spuriously tripped and a manual reactor scram was inserted as required by station procedures. The cause of the recirculation pump trip is under investigation.</br>Following the reactor scram, all rods were verified to be fully inserted and the Primary Containment Isolation System Group II (Reactor Building) and Group VI (Reactor Water Cleanup System) actuations occurred as designed due to the expected reactor water level shrink associated with the scram signal. All other plant systems responded as designed.</br>Currently reactor pressure is being maintained between 900 and 1050 psig with the Mechanical Hydraulic Control System (turbine by-pass valves). The Reactor Protection System has been reset; Reactor Water Cleanup System and normal reactor building ventilation have been restored. Reactor water level is being maintained in normal bands with the Condensate and Feedwater System. Off-site power is being supplied to the station by the Start-up Transformer (normal power supply for shutdown operations) and the switchyard ring bus has been restored.</br>This event had no impact on the health and/or safety of the public.</br>The USNRC Senior Resident Inspector is on-site and has been notified.</br>This 4-hour notification is being made in accordance with 10 CFR 50.72 (b)(2)(iv)(B).</br>The scram was uncomplicated and decay heat is being released to the main condenser via the turbine by-pass valves. condenser via the turbine by-pass valves. +
20:34:00, 10 January 2013 +
48,664 +
19:05:00, 10 January 2013 +
20:34:00, 10 January 2013 +
On Thursday, January 10, 2013 at 1534 hour … On Thursday, January 10, 2013 at 1534 hour (EST), with the reactor at 100% core thermal power, both recirculation pumps spuriously tripped and a manual reactor scram was inserted as required by station procedures. The cause of the recirculation pump trip is under investigation.</br>Following the reactor scram, all rods were verified to be fully inserted and the Primary Containment Isolation System Group II (Reactor Building) and Group VI (Reactor Water Cleanup System) actuations occurred as designed due to the expected reactor water level shrink associated with the scram signal. All other plant systems responded as designed.</br>Currently reactor pressure is being maintained between 900 and 1050 psig with the Mechanical Hydraulic Control System (turbine by-pass valves). The Reactor Protection System has been reset; Reactor Water Cleanup System and normal reactor building ventilation have been restored. Reactor water level is being maintained in normal bands with the Condensate and Feedwater System. Off-site power is being supplied to the station by the Start-up Transformer (normal power supply for shutdown operations) and the switchyard ring bus has been restored.</br>This event had no impact on the health and/or safety of the public.</br>The USNRC Senior Resident Inspector is on-site and has been notified.</br>This 4-hour notification is being made in accordance with 10 CFR 50.72 (b)(2)(iv)(B).</br>The scram was uncomplicated and decay heat is being released to the main condenser via the turbine by-pass valves. condenser via the turbine by-pass valves. +
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