This report describes an invalid actuation of the Unit 2 Turbine Driven
Auxiliary Feedwater Pump that occurred on October 31, 2019. This report is being made in accordance with
10CFR50.73(a)(1), which states, in part, 'In the case of an invalid actuation reported under
10CFR50.73(a)(2)(iv), other than actuation of the
Reactor Protection System (
RPS) when the reactor is critical, the licensee may, at its option, provide a telephone notification to the NRC Operations Center within 60 days after discovery of the event instead of submitting a written LER.'
On October 31, 2019, Comanche Peak Nuclear Power Plant Unit 2 was in Mode 1 operating at 100% power. At 1919 CDT, the Main Steam Line 2-01 steam supply valve to the TDAFWP opened due to a loss of continuity between the fuse supplying control power to the valve positioner and the fuse clips. Operators initiated a 50MW load reduction to maintain power less than 100%. The steam supply to the TDAFWP was closed, the TDAFWP was stopped, and the fuse clips were tightened. Unit 2 was returned to full power at 2055 CDT.
The specific train and system that actuated was the third AFW train on Unit 2. The train actuation was complete and during the TDAFWP start the system started and functioned correctly.
The NRC Resident Inspector was notified.
