Thermo-hydraulic analysis on in-bed calorimetry in a thin double-layered annulus metal hydride bed
2009
Abstract Korea has been developing the metal hydride beds for the ITER storage and delivery system (SDS). There are two major concerns for the bed: one is the rapid delivery/recovery rate according to the tokamak plasma operation scenarios, and the other is the accurate measurement of tritium inventory using in-bed calorimetry within limited time. One of the bed concepts considering now consists of the thin and double layers of ZrCo which are confined by the cylinder-shaped SUS filter and the primary vessel wall. The primary vessel wall is wound by the heating coils, and has the helium channels for the in-bed calorimetry. In this study, the three-dimensional thermo-hydraulic analysis is performed for the bed to investigate the in-bed calorimetry performance. Based on the transient simulation results with an assumption of complete removal of the decay heat by He-loop, it is found that the bed under pre-cooling condition satisfies the accountancy of ±1 g-T accuracy in 24 h and ±3 g-T accuracy in 8 h.
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