Seismic and random vibration analysis of internal cryogenic lines of cold valve box

To ensure proper forced flow cooling of superconducting magnetsin nuclear fusion reactor, sufficient mass flow rate with proper pressure head of cryogen is one of the critical parameters with respect to the operation scenarios involved. Under this condition, the role of cold circulating pump (CCP) is vital as it operates across the operation spectrum often without any redundancy. Consequently, a test is proposed in cryogenic test facility at Japan to simulate the thermo-hydraulic conditions with CCP, before actual operational deployment. Essential components for test are housed in a Cold Valve Box (CVB). Internal piping system of CVB is prone to experience random vibration during transport and installation in addition to ground acceleration during seismic event. The paper presents conceptual design as well as the associated seismic and random vibration analysis of CVB to ensure design safety within the relevant response spectrum likely to occur during its operational life.