PWR model steam generator corrosion studies. Final report

The results of a series of high-temperature heat-transfer corrosion tests are reported. The secondary environments consisted primarily of volatile additives faulted with various site cooling waters. The objectives of the program focused on a laboratory production of tube denting and the role of specific impurities relative to the accelerated corrosion of carbon-steel support structures. The effects of ionic elution and resin loss from a condensate polisher on the subsequent corrosion of heat-transfer tubing was examined via several long-term model boiler tests. Saturated resin fines, when injected into the test boiler, resulted in an aggressive environment which accelerated corrosion of both the carbon-steel support plate and the alloys 600 and 800 heat-transfer tubes. Corrosion observed consisted of tube denting, wastage, and intergranular attack