Study for behavior of tritium adsorption and desorption on the material surface

Kobayashi, Kazuhiro; Hayashi, Takumi; Yamanishi, Toshihiko; Oya, Yasuhisa*; Okuno, Kenji*

In a fusion reactor of high safety and acceptability, safe confinement of tritium is one of key issues for the fusion reactor. Tritium should be well-controlled and not excessively released to the environment and to prevent workers from excess exposure. Especially, the hot cell and tritium facilities of ITER will use various construction materials. For tritium desorption processes, so-called "soaking" effect is important. This effect is based on sorption of tritiated water vapor on the materials and subsequent desorption from them. Therefore, in order to develop for the optimal desorption technique, the desorption experiment was carried out as a function of water vapor concentration in the purging gas for organic materials. As the result, the effect of adding water vapor was found on the decontamination for organic materials.