Officials say a turbine trip triggered the shutdown at the Salem 2 nuclear plant at 2:28 p.m. on Friday. Plant operators have spent the weekend troubleshooting the problem, trying to determine what caused an electrical issue with the digital controls which are used to control the speed of the turbine.
- At 1429 hrs. EDT with RCPs 23 and 24 tripped the 21 and 22 steam generators (SG) dipped below the lo-lo level setpoints and caused an AFW actuation to occur.
- At 1457 hrs. EDT 23 turbine driven AFW pump was stopped in accordance with operating procedures.
- At 1509 hrs. EDT the 21 SG cleared the low level setpoint and at 1513 hrs. EDT the 22 SG cleared the low level setpoint.
- At 1523 hrs. EDT the 22 SG dipped below the lo-lo level setpoint and caused an AFW actuation to occur.
- The two motor drive AFW pumps continued to run throughout this event.
There is no estimated time when the plant will return to service.