On October 19, 2004, McGuire Nuclear Station Unit 2 experienced an inadvertent actuation of the Turbine Driven
Auxiliary Feedwater (TDCA) Pump. This event occurred when the steam supply valve to the pump failed open due to low pressure in the
nitrogen supply to the valve's actuator. Further evaluation determined that the inadvertent actuation of the TDCA Pump was not in response to actual plant conditions or parameters satisfying the requirements for actuation of the pump. Since the TDCA Pump was not started in response to a valid signal, this represented an invalid actuation reportable per the requirements of
10 CFR 50.73 (a) (2) (iv) (A). However, as per
10 CFR 50.73(a)(1), McGuire is providing a telephone notification of this invalid actuation instead of submitting a written LER.
The following additional information is being provided as part of the telephone notification of this event:
- The Unit 2 TDCA Pump actuated and injected water into all four of the Unit 2 Steam Generators
- The actuation of the Unit 2 TDCA Pump was successful and complete.
The licensee stated the total injection time was approximately 16 minutes and that a very small power increase was observed during the event.
The NRC Resident Inspector has been notified by the licensee.
