Design and optimization of pipeline in vacuum vessel pressure suppression system

The vacuum vessel pressure suppression system (VVPSS) is one of the important safety systems in CFETR, which is designed to protect the vacuum vessel and related components from overpressure damage that may occur under leak accident. The overall design and pipeline optimization of VVPSS is briefly described. With the operating requirements of the CFETR, the connection and function between the various components of VVPSS are mainly introduced; By the finite element analysis software, the pipeline scheme that have the least influence on the fluid flow is obtained in the two pipeline schemes; A preliminary study on whether it is possible to reduce the diameter of the rupture disc by increasing the number of bypass is done, which provide a certain reference basis for the design of rupture discs in nuclear fusion devices in the future. (authors)