Numerical study of transient flow in the preliminary design of fusion power shutdown system

The FPSS (fusion power shutdown system) provides a safety emergency shutdown system terminating the ITER (international thermonuclear experimental reactor). It has a reservoir of impurity gas and a dedicated tube for the impurity gas injection. In the preliminary design stage, the FPSS is studied as a sealed gas injection system, it is a supersonic and high pressure flow field. The transient flow of the system is analyzed with a commercial CFD code, ANSYS® FLUENT in this paper. To satisfy the functional requirement, the injected gas volume of the VV (vacuum vessel) is predicted from a series of tank pressures in 3s. The influence of initial tank pressures, vessel pressure and flow times of the FPSS is quantified. CFD data is compared with the experimental activities and the discrepancy is acceptable. All the results will be used for optimized design of the FPSS.