Automatic Reactor Trip Due to Feedwater Regulating Valve Failing Closed
At 1725 CDT, a Feedwater Regulating valve failed closed, resulting in a reactor level transient, which initiated a reactor trip, Primary Containment Isolation System signals to valves in Groups 2, 3, and 4 and initiation of High Pressure Coolant Injection and Reactor Core Isolation Cooling. All control rods inserted and level has been restored to normal. The cause of the feedwater valve failure is under investigation. All other systems responded as expected.
This report is being made under 10 CFR 50.72 (b)(2)(iv)(B), (b)(3)(iv)(A) and (b)(2)(iv)(A).
The Senior Resident Inspector has been informed.
Decay heat is being removed via the main condenser and reactor vessel water level is being maintained by the condensate and feedwater systems.