Leak detection design for ITER GIS gas fueling manifold

Abstract During the ITER plasma operation state, in order to prevent explosion or contamination risk, leaks of the gas supply pipes in the GIS gas fueling manifold especially the hydrogen isotope pipes shall be detected. To detect the leaks of the gas supply pipes, methodology of pressure monitoring and gas composition monitoring are employed, basing on the design of pressure cascade and interspace venting. By comparing the pressure signal of the gas supply pipe and the interspace, leaks of the gas supply pipe could be identified. By setting reasonable flow rate for interspace venting, at the same time monitoring the hydrogen isotope concentration in the venting flow, leaks of the hydrogen isotope pipes could be identified. Pressure alarm and H2/T2 alarm are set respectively, and leak of different dimension is identified.