The Design And Analysis Of CFETR Shield Blanket

Chinese Fusion Engineering Testing Reactor (CFETR) will aim to explore the scientific and technological issues for future fusion reactor. Presently, it is only in the status of conceptual design. CFETR will be a very complicated system, which is composed of lots of in-vessel components including the shield blanket (SB) system. The main function of the shield blanket is to provide the neutron shielding and thermal shielding for other components as well as the environments.According to the spatial structure of the CFETR vacuum vessel (VV), and the engineering and physical requirements in CFETR conceptual design stage, the SB concept, the SB materials and the cooling system are studied, including the structure mechanics. The SB performance is evaluated using MCNP and finite element method (FEM). The analysis indicates that the SB satisfies the design requirements at present stage.Firstly, the overall shield blanket design activities are carried out. The modular design is chosen and the 3D SB structure is built up by CATIA code. In the breeding region, there are 18 toroidal sectors with identical toroidal angular width (20°). Each toroidal sector includes 6 inboard modules,3 upper port modules,8 outboard modules amounting to 17 modules. Each module size adjusts to the spatial characterizations. As for the divertor region, there are 48 toroidal sectors with identical toroidal angular width (7.5°). Each sector has one integrated SB, which is attached to the cassette of the divertor.Secondly, the properties of the 316L(N)-IG, the reduced activated ferritic/martensitic (RAFM) steel F82H and the WC are studied, which are three possible choices for SB structure in future fusion reactor. The F82H, one of the RAFM steels, is selected as the shield material in terms of the physical and the mechanical properties, the corrosion resistance, the radiation resistance and the shielding ability.Then, the SB cooling system is designed based on the neutrons wall load and the design requirements. In terms of SB behind the breeding blanket, best cooling structure is obtained through analysis and optimizing. As for SB in behind the divertor, the cooling structure is simple because of the low neutron wall load.Finally, electromagnetic (EM) analysis in plasma major disruptions event (MDE) has been carried out. In MDE,10MA plasma current cleanses to zero rapidly within milliseconds. This will induce large eddy current in the SB and lead to the huge EM load. Two plasma current decay models are discussed in this paper, performances of the SB in MDE are obtained and the results will benefit the attachments design in next step.In a word, the preliminary design of the SB structure satisfies the design requirements of CFETR SB. The main innovations are made on the SB concept for the future fusion reactor. In particular, the neutronics study on the shield materials, the CFD simulations as well as the EM analysis in MDE on the SB are detailed. The data and results will benefit in next SB design campaign for CFETR as well as other future fusion reactors.