The Reliability Analysis and FMECA Analysis of Cryogenic Distribution System for Cryogenic System of HL-3

The cryogenic technology was widely used in superconducting devices to provide supercritical helium or superfluid helium. As a vital constituent of the helium cryogenic system, the cryogenic distribution system plays an indispensable role in supplying helium to superconducting devices. HL-3 Tokamak has established the 500 W@4.5 K cryogenic system to provide supercritical helium through the cryogenic distribution system. To maintain the stable operation of the cryogenic distribution system, the FMECA analysis(Failure Mode, Effects and Criticality Analysis) has evaluated 17 failure models and proposed mitigation measures to reduce risks. Meanwhile, the reliability analysis was conducted to analyze the reliability and availability of the cryogenic distribution system. The research results indicated that the reliability of this helium cryogenic distribution valve system was 96.7% in 3 months, 95.9% in 6 months, as well as the availability was 99.93% in 3 months, 99.91% in 6 months, which could maintain the stable operation.