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| Book/Report | FZJ-2016-03084 |
1974
Kernforschungsanlage Jülich GmbH, Zentralbiliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/11451
Report No.: Juel-1111-RG
Abstract: In the scope of the projects "THTR" and "Process Heat Reactor" an experimental facility has been built up as a contribution for the development of high-temperature reactors. Laboratory-scale experiments were performed on boiler and heatexchanger materials. Special attention was given to the assessment of the hydrogen amount delivered into the primary helium coolant circuit. Hydrogen was set free by the oxidation of the metal by the secondary coolant at the inner surface of test tubes. In the next step it permeates the tube wall and reaches the outer surface of the tube which is in contact with the primary coolant. The specimens were capsules made out of tubes of different materials. Furthermore the carburization of boiler materials by low concentrations of carbon monoxide as impurity in the coolant gas was investigated. Supplementary some measurements on hydrogen permeation through such tubes were performed. A brief discussion for the coolant chemistry of helium and water as well as the discussion of some surface phenomena is included. A description of the apparatus and the experimental method follows. The results of hydrogen delivery measurements and of metallographic investigations are presented. lt is shown that under specific conditions the boiler tubes would not carburize. On the contrary, they might, however, be decarburized by hydrogen permeating through the tube wall. The amount of hydrogen delivered into the primary circuit of the THTR under normal conditions can be managed well by means of the gas-purification plant.
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