Report

FZJ-2016-05881

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Korrosion von graphitischen Hochtemperaturreaktor-Werkstoffen mit Wasserdampf/Helium Mischungen im Druckbereich von 3-55 bar bei Temperaturen von 900-1150°C

Hinssen, H.-K.FZJ* ; Katscher, W.FZJ* ; Loenißen, K.-J.FZJ* ; Moormann, R.FZJ*

1993
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/12688

Report No.: Juel-2747

Abstract: In course of accident examination for High Temperature Reactors (HTR), experiments on the corrosion behavior of graphitie reactor materiale in steam have been performed at total pressures of 3-55bar and temperatures of 900-1150°C (1173-1423K); these experiments and their evaluation are documented here. Reactor materials examined are the structure graphite V483T2 and the tuel element matrices A3-27 and A3-3. In all experiments, the stearn partial pressure was 474rnbar (inert gas helium). The dependence of reaetion rates and density profiles on burn-off, total pressure and temperature has been examined. Experimental reaction rates depending on burn-off are fitted by theoretical curves, a procedure, which allows rate comparison for a weil defined burn-off. Comparing rates as a function of total pressure, V483T2 shows a linear dependence on 1/$\sqrt{p_{total}}$ whereas tor matrix materials a pressure independent rate was found for P$_{total}$< 15bar. The temperature dependence of rates (in-Pore diffusion controlled regime) is characterized by activation energies of 246kJfmol (V483T2) resp . 185kJ/mol (matrix materials). For corroded specimens, density profiles have been measured in order to obtain some information about depth of material damage. In detail depth of penetrations of corrosive attack are 0.2 - 2.5mm tor V483T2, 1 .1 - 2.8r-nm for A3-27 and 1 .5 - >4mm for A3-3.

Note: Zusammenfassender Bericht der Experimente im Institut für Nukleare Sicherheitsforschung (ISF) jetzt Institut für Sicherheitsforschung und Reaktortechnik (ISR)

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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