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On Tuesday, May 22, 2012 at 1311 hours (ED … On Tuesday, May 22, 2012 at 1311 hours (EDT), with the reactor at approximately 35% core thermal power, during a planned power reduction to support thermal backwash of the main condenser, a manual reactor scram was inserted due to degrading main condenser vacuum. The cause of the degraded vacuum is currently 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. Standby Gas Treatment System Train 'B,' which is designed to shutdown 65 seconds after the Group II signal is received if the Standby Gas Treatment Train 'A' is in service, continued to operate until manually secured. With this exception, all other plant systems responded as designed.</br>Currently reactor pressure is being maintained at 920 psig with the Mechanical Hydraulic Control System (turbine by-pass valves). 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).</br>This event had no impact on the health and/or safety of the public. The NRC Senior Resident Inspector has been notified." </br>The licensee has notified the Massachusetts Emergency Management Agency.Massachusetts Emergency Management Agency. +
17:11:00, 22 May 2012 +
47,945 +
16:33:00, 22 May 2012 +
17:11:00, 22 May 2012 +
On Tuesday, May 22, 2012 at 1311 hours (ED … On Tuesday, May 22, 2012 at 1311 hours (EDT), with the reactor at approximately 35% core thermal power, during a planned power reduction to support thermal backwash of the main condenser, a manual reactor scram was inserted due to degrading main condenser vacuum. The cause of the degraded vacuum is currently 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. Standby Gas Treatment System Train 'B,' which is designed to shutdown 65 seconds after the Group II signal is received if the Standby Gas Treatment Train 'A' is in service, continued to operate until manually secured. With this exception, all other plant systems responded as designed.</br>Currently reactor pressure is being maintained at 920 psig with the Mechanical Hydraulic Control System (turbine by-pass valves). 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).</br>This event had no impact on the health and/or safety of the public. The NRC Senior Resident Inspector has been notified." </br>The licensee has notified the Massachusetts Emergency Management Agency.Massachusetts Emergency Management Agency. +
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