Abstract
Abstract The use of sodium as a heat transfer agent in nuclear power plants has resulted in a new phase of corrosion technology to evaluate the surface properties of materials of construction for high temperature, irradiated, liquid metal cooled heat transfer systems. In pure sodium, engineering alloys may be subject to mass transport effects, preferential solution of alloying constituents and diffusion welding of mating surfaces. Trace amounts of impurities which are difficult to remove result in damaging oxidation and also act to accentuate preferential solution phenomena, particularly decarburization and intergranular attack. The resistnce of alloys to attack by sodium has been investigated in static and dynamic laboratory tests and in pilot plant heat transfer systems. Extensive laboratory data and service performance indicate that the design engineer has a wide selection of materials of construction that will give satisfactory service in high temperature sodium systems.
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