At 1024 EDT a
reactor trip occurred during maintenance activities involving the
control rod drive trip breakers. All
control rods fully inserted. The unit is currently stable with
decay heat removal via the
main steam system through the
turbine bypass valves to the
main condenser. Post trip response was normal with the following exceptions noted:
1. #4 main turbine stop valve may not have fully closed.
2. A #2 Steam Generator Safety Valve may be lifting early (lifted at 1010 psi rather than the 1050 psi setpoint).
3. Turbine Bypass valve SP13A3 stuck slightly open - isolated.
All offsite power lines have been verified operable and both
EDGs are available in standby, if needed. The licensee informed the local sheriff's department as required whenever a
Steam Generator Safety valve lifts and the NRC Resident Inspector.
