![]() For the fuel-breeder pin concept, even with a roughness of Rz = 260 µm on the surfaces of the annular channel of the fuel-breeder pin, the pressure drop of the blanket unit-slice was about 0.34 bar. The other dimensions of the fuel-breeder pin are shown in Figure 1C-C. The axial length of the fuel-breeder pin is about 570 mm. For completeness, the HCPB blanket is shown in Figure 1. The design status and descriptions of the fuel-breeder pin concept of the HCPB blanket is described elsewhere. The scope is to validate the heat transfer correlations for the smooth and rough annular channels, computational fluid dynamics (CFD) codes, and thermal hydraulics system codes. This present article reports the engineering design of the first-ever breeder zone mockup of the fuel-breeder pin concept of the HCPB breeding blanket. More recently, activities to validate the heat transfer correlations for the smooth and rough annular channels and to investigate the nonuniform flow patterns of the return flow in the annular channel of the fuel-breeder pin concept of the HCPB breeding blanket were started. Experimental campaigns reproducing the DEMO-relevant thermal hydraulics conditions during normal and off-normal situations of the FW of HCPB breeding blanket were done in a large-scale helium loop facility. The PREMUX experimental investigations were done to benchmark the existing finite element method codes used for the thermo-mechanical assessment of the lithium ceramic pebble beds and to measure the thermal conductivity of the lithium ceramic pebble beds. The heat transfer and pressure drop of transverse ribs and V-shaped ribs in the First Wall channel of the HCPB breeding blanket were experimentally studied in a pressurized air facility. ![]() The mass flow distribution of the HCPB TBM coolant system were performed in the GRICAMAN experimental facility. The HETRA experimental campaigns on the helium-cooled First Wall of the HCPB test blanket module (TBM) were conducted to investigate the thermal hydraulic (heat removal and pressure drop) effectiveness of the surface roughness in the First Wall channels in 8 MPa pressure and 300 ☌ temperature conditions. A series of design and experimental activities for testing the components of the HCPB blanket were conducted in the last decade. As we are consolidating the concept, there is an increasing need to proceed to qualify the blanket concept through testing. ![]() Over the last decade, many design activities on the HCPB have been performed. ![]() Within the EUROfusion framework, Karlsruhe Institute of Technology (KIT) is leading the development of the Helium Cooled Pebble Bed (HCPB) breeding blanket, one of the two driver-blanket candidates (e.g., HCPB and the Water Cooled Lead Lithium-WCLL ) selected for DEMO and to be tested in ITER. ![]()
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