关键词: 汇集管道, 现场安装, 泄漏检测, 氦喷吹法, 氦吸枪法

Abstract: According to the leak testing requirements defined in the ITER vacuum handbook, the leak testing scheme for the gas fueling manifold of ITER gas injection system during the on-site assembly was proposed. The inner pipes of the gas injection manifold are leak tested by helium spraying method. According to the welding sequence of the port cell, it will be implemented when the welding work of a pipe in each port cell is finished. The maximum pumping time and response time required by the inner pipe leak testing are estimated and results show that maximum pumping time is less than 30 min and response time is less than 10 min for single leak test. The guard pipe of the gas fueling manifold is leak tested by helium sniffing method, which is implemented after all the welding work of the guard pipe is finished.

Key words: Gas fueling manifold, On-site assembly, Leak testing, Helium spraying, Helium sniffing