This document discusses the special requirements and considerations for forming, welding, and heat treating stainless steel components for nuclear reprocessing plants. Key points include: 1) Stainless steel 304L is used as the primary construction material due to its corrosion resistance in acidic media up to 12M nitric acid and elevated temperatures up to 1200C in radioactive environments. 2) Cold working is minimized to reduce sensitization, and solution heat treatment is used to restore corrosion resistance. Welding uses manual GTAW with strict controls on filler wire composition and residual stresses. 3) Stringent quality controls are applied during all stages of design, fabrication, installation and operation to ensure cleanliness and prevent defects from initiating corrosion. Mock