Activation Calculation And Analysis For CFETR Magnet System

China Fusion Engineering Test Reactor (CFETR),which is the first fusion reactor prepared to be built in China, is still in the design stage.In order to ensure the plan carried out successfully, a series of preparatory tasks are necessary. Among these tasks is the important task of evaluating the safety of CFETR. Considering from the viewpoint of radiation protection for CFETR, simulated calculation for constructing CFETR is of significance. CFETR use superconducting magnets to constrain the core plasma, wherein the sub-activation analysis and calculation for fusion reactor design is an essential part. This paper reports a Monte Carlo study using the MCNPX code to simulate the neutron transport properties of the superconducting magnets of the CFETR device. By using MCNPX, needful neutron parameters including neutron flux, nuclear heat deposition, neutron energy spectrum and so on were calculated based on a simple three-dimension model of full device of CFETR. With the above results of neutron transport, further activation calculations could be calculated. FISPACT is chosen as activation calculations tool in this paper. FISPACT is now used by many groups throughout Europe and has been adopted by the ITER project as the reference activation code.In this paper, FISPACT is used to calculate the activation of superconducting coils at different times under the condition of full power operation for 2 years.The maximum product of neutron fluence and neutron energy appears in the inner part of superconducting magnet which is 3.97×1014 MeV/m2, and the superconducting magnet under this circumstance is applicable at high temperatures superconducting condition. The radioactivation level of magnet component is medium radioactivity standard. The total activity for all materials of magnet component will be 6.14×108Bq/kg in 10 years which decreases two orders of magnitude.