Abstract
This paper deals with tasks, structure and experience gained from the two helium test facilities, EVA II and KVK, which are part of the main tools within the framework of component development for a high-temperature reactor. Special techniques (internal insulation, cooling by using cold gas) for the components became necessary to separate high temperatures (950°C) from the pressure-loaded component parts. The question of helium atmosphere and its interaction with high-temperature materials could be sufficiently investigated. Well-developed oxide layers were obtained on the helium side. Excellent reliability and flexibility of the facilities have been obtained. The following components have been tested in due time and at moderate costs: • • Steam reformers • • Helium heat exchangers • • Steam generators • • Hot gas valves • • Hot gas ducts • • Blowers In addition to the experimental results practical experience gained with helium technology is of essential importance for further work relating to HTR development and design.
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