N-1CI C0080150 – TUC1 HP Turbine Refurbishment - $2,527,606 - Redacted
8 passages
DESCRIPTION: This project is for the detailed inspection and refurbishment of the Tufts Cove Unit 1 (TUC1) High Pressure (HP) turbine components, including the rotor, diaphragms, glands and bearings, to eliminate turbine vibration and to r...
AI summary The project involved inspecting and refurbishing Tufts Cove Unit 1's high-pressure turbine components to eliminate vibration and restore stable operation. Disassembly revealed issues requiring rotor refurbishment through grit blasting and balancing, which successfully resolved vibration problems post-reassembly.
Plant/Unit: TUFTS COVE-1 Siemens Energy Limited provided technical field advisors required to complete the work scope. The work schedule was two 10-hour shifts per day, 6 days a week. This schedule was maintained throughout the outage. The...
AI summary The outage at TUFTS COVE-1 involved Siemens Energy Limited providing technical field advisors, with labor provided by Nova Scotia Power and Fundy millwrights. The work schedule was two 10-hour shifts per day, six days a week, maintained throughout the outage.
Action Taken HP paddle glands were removed, cleaned, inspected, measured and reinstalled; replaced paddle gland piping gaskets. HP expansion rings were removed, cleaned, NDE inspected and reinstalled. As Left bottom leads were recorded on...
AI summary Maintenance activities included removal, cleaning, inspection, and reinstallation of HP paddle glands and expansion rings, with NDE inspections conducted. Measurements and sealing compound application were performed during HP outer cylinder setup, and cover gaps were recorded for both unbolted and bolted conditions.
Action Taken Four dowels were fabricated for the inner cylinder as the originals were lost. Recorded HP inner cylinder distortion on the diaphragms using Metronor. As Left bottom leads were recorded on the diaphragms and glands. Half joint...
AI summary Maintenance actions on TUFTS COVE-1 Unit included fabricating dowels for the HP inner cylinder, measuring distortion with Metronor, cleaning and sealing the cylinder, and recording cover gaps under unbolted and bolted conditions. Technical procedures focused on structural integrity and alignment.
Recommendations Replace damaged/worn seals. PCM recommended adjusting diaphragm radial clearances to bring them closer to design specification during the next available HP outage. Metronor distortion checks were conducted on the inner cyli...
AI summary The text recommends replacing damaged seals, adjusting diaphragm radial clearances during the next HP outage, and rechecking Metronor distortion measurements if there is a significant difference between previous and current outages.
As Found Plant/Unit: TUFTS COVE-1 As Found clearances were recorded, the vast majority were outside of tolerance. Gland seals were removed, cleaned and staged for inspection. Visual inspection of the gland seals revealed wear and damage on...
AI summary Inspection of TUFTS COVE-1 revealed most clearances were outside tolerance, with gland seals showing wear and damage from steam erosion and age, necessitating removal for assessment.
Action Taken Diaphragms were removed, grit blasted and NDE inspected. The diaphragm airfoils were blended by a Siemens Energy blader to sharpen the blade edges as well as blend out the indications discovered during NDE inspections. Two ind...
AI summary Diaphragms underwent NDE inspection, grit blasting, and blending. Two indications were found, with diaphragm 4 developing a void during blending. The customer halted further blending and returned the diaphragms to service, while diaphragm 6's indication was successfully blended.
Activity Plant/Unit: TUFTS COVE-1 Disassemble, clean, inspect and reassemble.
AI summary Maintenance activities at TUFTS COVE-1 plant unit involve disassembling, cleaning, inspecting, and reassembling equipment as part of operational procedures.