Activation Calculation And Analysis For CFETR

China is designing the first fusion reactor of China-China Fusion Engineering Test Reactor(CFETR),the neutron activation analysis plays a important role in the assessment and inspection of CFETR, and provides data for designing other related systems and assessment of nuclear waste. This paper considers the current CFETR design, and simplify it to a one-dimensional model. With the multi-particle transport code FLUKA, the neutron activation character of the tritium breeding blanket, shielding layer, vacuum vessel material and TFC of CFETR has been calculated to verify the radiation safety of the present design. The related results provides data reference for designing the components of CFETR and for further neutron activation analysis and calculation.Firstly, to reduce the computational complexity, CFETR is simplified to a one-dimensional model according to the present design. The neutron-flux density changes in radial direction is calculated with FLUKA code assuming the fusion reactor operates in max fusion power, which provides the basis for the after neutron activation calculation.Secondly, under the condition of CFETR has been operating in200MW fusion power for one year and shutdown, the specific activity and total activity of each region of the fusion reactor is calculated. After that, the total activity of each region is figured out.Finally, the main radionuclide in different region and different time is analyzed. The neutron activation character of the tritium breeding blanket, shielding layer, vacuum vessel material and TFC is acquired.The calculation results show that under the circumstances of one year operation with200WM fusion power, the total radioactivity is1.05×1019Bq after shutdown and1.03×1017Bq after cooling for ten years. The primary residual nuclide is55Fe after decaying for ten years. It shows that there isn’t seriously activation safety issue.