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Adsorption and Desorption Rate of Water on the Various Ceramic Breeder Materials

Yoshinori Kawamura, Masabumi Nishikawa

Fusion Science and Technology / Volume 27 / Number 1 / Pages 25-35

January 1995

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The release behavior of tritium bred in the blanket has been studied with in-situ experiments, and most of the results are analyzed assuming that the overall release process of tritium is mainly controlled with the process of tritium diffusion in the crystal grain. However, quantification of the water adsorption and desorption rate on various ceramic breeder materials is important because the chemical form of release tritium is tritiated water. The current authors carried out the water adsorption and desorption experiments on various ceramic breeder materials using a breakthrough method and the adsorption and desorption rate of water at the surface of various ceramic breeder materials were estimated from the breakthrough curve and release curve of water obtained in this work. The breakthrough curves or desorption curves were expressed assuming that two kinds of adsorption or desorption processes having different mass transfer rates proceed at the same time. The hypothetical tritium diffusivities in the crystal grain evaluated from the water desorption rate obtained in this work were compared with the reported value as the tritium diffusivity in the crystal grain. It is probable that the tritium diffusivity in the crystal grain reported so far is strongly affected by the resistance of surface reaction and the system effect.

 
 
 
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