BC Engineering and Design engineers have worked several projects at the Oconee Nuclear Station.
BC Engineering and Design was contracted to verify the rotor hub measurements on one of two of the hydroelectric dam generators while it was removed for stator repairs. This particular opportunity does not often occur. While the rotor was removed, providing access to the hub assembly connection, BC Engineering and Design engineers used a FARO® Laser Tracker portable CMM unit to take accurate measurements on the hub connection relative to the stator assembly.
By performing this measurement task while the opportunity presented itself, Duke engineers were able to ensure that future generator replacement planning could be accurately assessed without an additional removal of the rotor, thus avoiding costly delays.
The pump maintenance division of Duke Energy at the Oconee Nuclear Station had three articulating handling arms for installing and removing the pump seal housings for the Reactor Coolant Pumps.
Due to the size and weight of the seal housings, the operators are required to install the handling fixtures (articulating arms) on the pump base and attach the seal housing.
A new seal design was developed which required an adapter for the handling fixture but no drawings were available for the existing fixture.
Using a FARO® portable CMM Platinum arm, BC Engineering and Design engineers reverse engineered the fixture, developed a 3D model, and 2D ASME drawings for the assembly. The drawings and model were supplied to the vendor developing the new seal assembly. The vendor was able to design an adapter for the existing handling fixture to mate with their new housing.
Duke Energy mechanics required a maintenance platform that would fit around the Low Pressure (LP) turbine when the cover was removed. The platform would be used for maintenance personnel to work on the turbine as well as serve to prevent foreign material from getting into the open condenser below (FME – Foreign Material Exclusion).
The window of opportunity to get accurate measurements was very short without interfering with the shutdown scheduled maintenance.
BC Engineering and Design engineers were able to accurately scan the turbine at six locations around the perimeter in less than two hours using a FARO® FOCUS 3D scanner and get accurate point cloud data which was used for design planning after the plant maintenance was completed the turbine was back in operation. The point cloud data was then imported into 3D software and a 2D outline at various slice thicknesses reproduced the outline up against the turbine.