Abstract
Two-phase erosion corrosion is a world-wide problem and has been experienced in steam-generating plants in both Europe and the USA. In the UK, carbon steel boiler tubes in a number of Magnox Power Stations, operated by Nuclear Electric, have suffered from failures caused by two-phase erosion corrosion. Following a comprehensive investigation of the phenomenon, Nuclear Electric has solved this problem by changing to amine-dosed feedwater in place of the original ammonia treatment. This investigation included laboratory and large-scale rig studies together with a plant trial, which lead to a successful outcome. This paper describes in detail the important part ion chromatography has played in this project. The analytical procedures are described and calibration curves are included. Examples of practical results obtained in the laboratory, in rig tests and in a plant trial are given. Further examples of cation chromatography will demonstrate application to product purity determination and thermal break-down behaviour under simulated and real plant conditions.
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