🧪 PWR Steam Generator Blowdown & Chemistry Control

Steam generator blowdown is essential for maintaining secondary‑side chemistry, preventing corrosion, and ensuring long‑term steam generator integrity. Controlled removal of a portion of the secondary water helps manage impurities, dissolved solids, and corrosion products.

• Impurity Removal: Controls concentration of dissolved solids and sludge‑forming species.
• Corrosion Mitigation: Reduces risk of tube pitting, denting, and stress corrosion cracking.
• Steam Quality Control: Ensures high‑purity steam for turbine protection.
• Sampling & Monitoring: Provides real‑time chemistry data for operators.

• All‑Volatile Treatment (AVT): Uses ammonia or amines to control pH and minimize corrosion.
• Oxygen Control: Maintains reducing conditions to prevent oxidation.
• Condensate Polishing: Removes ionic impurities before feedwater enters the SG.
• Sludge Lancing: Periodic maintenance to remove deposits from tube sheet regions.

• Protects steam generator tubes — a major safety boundary.
• Improves turbine reliability and efficiency.
• Supports long‑term plant chemistry health.