Fermi Unit 2 FWH Replacement
Project Highlights
- Sargent & Lundy supported DTE through all project phases by working closely with stakeholders, the implementation team, and vendors.
- All six replacement No. 3, No. 4, and No. 5 feedwater heaters were installed during the Spring 2026 refueling outage.
Project Description
The Fermi 2 North and South No. 3, No. 4, and No. 5 low-pressure FWHs were approaching the end of their operational lives and experienced reduced thermal performance and age-related degradation, resulting in numerous condition reports over several years.
Project Scope
DTE contracted Sargent & Lundy to complete design work for all project phases associated with replacing the North and South No. 3, No. 4, and No. 5 FWHs, including the study, purchase specifications, modification packages, fabrication, and installation support. The No. 5 FWHs were designed to submerge tubes in the condensing zone to provide subcooling and prevent drain-line flashing during future power maneuvers. The replacement scope included all piping rerouting and modifications associated with relocating or reconfiguring replacement FWH nozzles, as well as temporarily removing or permanently resolving interferences involving piping and equipment along the FWH removal and installation path. Additionally, the small-bore vent and drain lines with leakage concerns were redesigned to incorporate dual isolation globe valves for proper isolation.
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