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内容記述 |
The water-cooled ceramic breeder (WCCB) test blanket module (TBM), developed by Japan, is planned for installation in the ITER #18 equatorial port. This initiative aims to validate tritium breeding and extraction, guiding the exploration of breeding blankets for DEMO. The TBM consists of 56 submodules, a header, and supporting structures, all designed for tritium breeding, fluid management (including cooling water and helium purge gas), and mechanical connections to the TBM shield. The primary structural material for the TBM will be a Japanese reduced activation ferritic martensitic steel known as F82H. The WCCB requires coolant conditions similar to those of a Pressurized Water Reactor (PWR), with normal operation at 15.5 MPa and 280°C, to withstand the thermal load from ITER. Thus, the thermal-hydraulic performance of the WCCB TBM needs to be quantitatively analyzed to ensure adequate heat removal capability in the current structural design. In this study, a physical mock-up of the WCCB TBM, constructed from F82H, will be tested under PWR-like coolant conditions. The testing aims to measure surface temperatures and pressure loss between the inlet and outlet of the mock-up. A computational fluid dynamics (CFD) analysis will also be performed to assess the pressure loss of the physical mock-up and flow velocity, supporting further design work. The physical mock-up is designed based on the current structural design of the WCCB TBM and will be evaluated in a vacuum environment of 10^-4 Pa. The coolant conditions will simulate PWR conditions. Pressure gauges and thermocouples will be installed at the inlet and outlet of the mock-up. A three-dimensional CFD analysis will be conducted using the commercial software ANSYS Fluent, employing a steady flow analysis with a k-ω viscosity model for the coolant channels. The experimental results indicate a homogeneous temperature distribution on the physical mock-up, with no hot spots observed. The monitored surface temperatures corroborate the CFD results regarding flow velocity. The measured pressure loss between the inlet and outlet matches the values predicted by the CFD analysis. A detailed description of the investigation procedures and a discussion of the experimental and CFD analysis results will be presented. |
