Parametric analysis of the helium flow for the in-bed calorimetry of metal hydride bed

Korea has been developing several concepts of the metal hydride beds for the ITER storage & delivery system (SDS). A thin double-layered annulus metal hydride bed is under development. It consists of the thin and double layers of ZrCo which are confined by the cylinder-shaped SUS filter and the primary vessel wall. The helium channels for the in-bed calorimetry are drilled at the primary vessel wall. Three-dimensional numerical simulation of the in-bed calorimetry of the metal hydride bed is performed. The temperature and flow rates are the major parameters of the helium flow condition of the in-bed calorimetry. The optimal helium flow condition determines the performance of the in-bed calorimetry which is evaluated by the time to steady state of heat exchange and the accuracy achieved. The various helium flow conditions are investigated and the pressure drop of helium flow is monitored. Based on the simulation results, the operation scenario of in-bed calorimetry of metal hydride bed is obtained. The results will be compared with the experimental test results on in-bed calorimetry performance of the 1:1 full scale mock-up bed.