Increasing the feedwater pH by increasing the ammonia concentration is one way of minimizing the transport of corrosion products to steam generators and also reducing the risks of erosion-corrosion of carbon and low alloy components in the secondary circuit. The increased ammonia load could cause difficulties with full-flow condensate purification plants, where the quality and quantity of treated water must be retained. Investigational work has enabled a range of possible operating options to be identified. These arise from advances in the chemistry of ion exchange processes and a consideration of relevant plant factors