North Anna NGS Project
The job was to perform a weld overlay repair on the entry nozzle of a steam generator, a large tapered nozzle approximately 42" in diameter. My role was to design the nozzle coupon, the portion of the mock-up holding the coupon, the grinding head used to smooth the weld overlay for inspection, the track mounted to the pipe on which the weld and grinding heads ran, and to process the laser scan data from the field. The laser scan data was converted into a surface model and compared to a nominal model created from the plant's construction drawings. Supplemented by field measurements, this ensured that the mock-up clearances accurately represent the field conditions. The work was ultimately completed on time and the repair was a success. The power plant is currently providing power to the northern Virginia area.