[1L15-18] Tritium in DEMO/LHD/JET

[1L17] Scenario of tritium decontamination on plasma-facing components in Fusion DEMO

*Naoko Ashikawa^1,2, Yuji Torikai³, Kazuaki Kasai³, Yoji Someya⁴, Akira Taguchi⁵, Kiyohiro Yabuuchi⁶ (1. NIFS, 2. SOKENDAI, 3. Ibaraki Univ., 4. QST, 5. U. of Toyama, 6. Kyoto Univ.)

Keywords:Tritium decontamination, Fusion DEMO, Operational Scenario

The tritium (T) decontamination scenario before the beginning of periodic maintenance is critical for obtaining the constructional and operational licenses of DEMO. This study classifies the available methods for tritium decontamination in DEMO reactors into three categories, and provides examples based on the candidate parameters and each operational phase of DEMO. Laboratory scale experiments demonstrated that the presence of moisture in working gas significantly enhanced T desorption. Moreover, a part of T in W with radiation damage could be desorbed in the temperature range near 623 K by the isothermal desorption method.