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- W2119991454 abstract "The first wall in a fusion power plant is usually designed to accommodate a steady-state heat flux up to 1.0 MW/m, meeting the design criteria, including: (1) material temperature limits for avoiding embrittlement and thermal creep strength, (2) primary stress intensity limit in the elastic regime (Sm limit of the ASME code), and the sum of the primary and secondary stresses under 3 Sm, (3) coolant pumping power influencing the cost of electricity. In our ARIES-CS and ARIES-ST power plant studies, the temperatures and stresses are very close to the limits for the selected reduced-activation ferritic steel (RAFS) as structural material and He as coolant with operating pressure of 8 MPa and a surface heat flux of 0.76 MW/m. However, there are indications that transient peak heat fluxes up to ~ 2 MW/m for time periods up to a few seconds can occur at certain regions of the FW, accompanied by substantially higher erosion in such regions. In order to avoid intolerable damage during such transients, it is necessary to find a kind of the FW armor that can survive in such regions. It is mandatory that such transients do not require the FW exchange because this could lower the availability of the power plant to intolerable values. This paper presents the innovative FW armor design concept similar to the micro-brush concept developed for ITER divertor target. It is a combination of the pure W or W-alloy (such as WL10) and 12YWT ODS-steel for an assumed transient heat flux of 2 MW/m over a 5 second period of time." @default.
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- W2119991454 date "2011-07-01" @default.
- W2119991454 modified "2023-09-28" @default.
- W2119991454 title "Innovative First Wall Concept Providing Additional Armor at High Heat Flux Regions" @default.
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- W2119991454 doi "https://doi.org/10.13182/fst11-a12371" @default.
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