In fusion blankets, the pebble bed form offers several attractive features, including simpler assembly into complex geometries, a uniform pore network and low sensitivity to cracking or irradiation damage. Ceramic breeder pebbles have been a focus for several research groups. In general, the database is similar to that of monolithic pellets for ...

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The EU Fusion Programme develops for the short term of fusion power technology two breeding blanket conceptual designs both helium cooled. One uses Li-ceramic material (HCPB, Helium-Cooled Pebble Bed) and the other a liquid metal eutectic alloy (Pb15.7Li) (HCLL, Helium-Cooled Lithium Lead). Both are Li-6 enriched materials.

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The helium-cooled pebble bed (HCPB) blanket for a fusion DEMO reactor is based on the use of separate small lithium orthosilicate and beryllium pebble beds placed between radial toroidal cooling plates. The cooling is provided by helium at 8 MPa. The tritium produced in the pebble beds is purged by the flow of helium at 0.1 MPa.

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You can switch between different properties groups using "Select property set" button in the menu on top. After choosing alloy you are interested in, please click on its symbol ( i.e. CuMg0,5) to look through all properties. If you are interested in specific property click on the mark to go directly to it.

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PEBBLE BED MODULAR REACTORS (PBMR) Of the more innovative Generation III reactor types, the best known is the Pebble Bed Modular Reactor (PBMR). (Thomas, 1999; Harding, 2004; Hirsch et al., 2005.) PBMRs are helium cooled and graphite moderated and intended to be built in small modules.

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Thermal‐hydraulic characteristics in the pebble bed reactor core are of great significance to the safety evaluation and design of such reactors. Experimental investigations on the thermal‐hydraulics of different fluids in the pebble‐bed‐type of nuclear reactor core have been reviewed in this paper.

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China has proposed several concepts of breeder blanket for future fusion reactor, one of which is the helium-cooled pebble bed (HCPB) blanket. HCPB blanket is a cellular design with solid breeder units (BUs) and other structural components to achieve its functional requirements. BU of the HCPB blanket consists of lithium ceramic breeders and beryllium pebble beds separated by cooling …

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X-energy. (link is external), located just outside the nation's capital in Rockville, Maryland, is working on a pebble bed, high-temperature gas-cooled reactor that the company says can't melt down. The company's Xe-100 reactor and specialized uranium-based pebble fuel could be available in the market as early as the late 2020s.

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"Influence of bed conditions on the effective thermal conductivity of ceramic breeder pebble beds using thermal DEM (TDEM)." Fusion Engineering and Design 159 (2020): 111767. Peeketi, Akhil Reddy, Desu, Raghuram Karthik, Pramod Kumbhar and Annabattula, Ratna Kumar.

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The pebble bed reactor was developed by Professor Rudolf Schulten in Germany, where a small test reactor, the above-mentioned AVR, operated for over 20 years. Later a full-scale power reactor was built, the 300 megawatt THTR, which was designed to be able to operate with a combination uranium-thorium fuel.

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The latest pebble bed reactor designs using Thorium solve a great deal of the perceived problems of waste and safety. Research into nuclear fusion is moving apace, an will, perhaps in my lifetime, have a solution that produces no nuclear waste, completely safely.

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As the world's first pebble-bed modular high-temperature gas-cooled reactor, the demonstration project used more than 2,000 sets of equipment for the first time, and more than 600 sets of innovative equipment, including the world's first high-temperature gas-cooled reactor spiral-coil once-through steam generator.

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Gas-gap (eurofer floating plates and pebble beds) detection by pebble-bed infiltration Pebble bed deformation to estimate compaction Pebble deformation (if possible number of contacts and contact area's etc.) For the verification of the HCPB concept Pebble fragmentation, porosity, tritium release for ceramic and beryllium pebbles

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For a reliable design of fusion blankets with breeding pebble beds it is important to have validated computational tools for predicting the thermomechanical conditions like stresses, strains, or heat transfer. An early blanket using pebble beds as breeding material had been proposed by Dalle Donne, Fischer, Norajitra, Reimann and Reiser (1995).

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the pebble fuel reaches 1873K, ranges from 5.5 to 80 hours. Additionally, it is illustrated that, fundamentally, the LOCA characteristics of pure fission pebble beds and fusion-fission pebble beds are different. Namely, the former depends on the pebble fuel's large thermal capacity,

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Tanigawa H. et al 2005 Effective thermal conductivity of a compressed Li 2 TiO 3 pebble bed Fusion Eng. Des. 75-79 801. Crossref Google Scholar. Tanigawa H. et al 2007 Measurement of thermal expansion of Li 2 TiO 3 pebble beds Fusion Eng. Des. 82 2259. Crossref Google Scholar.

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Assuming a pebble bed is a continuum medium, the phenomenological model, as the second approach, describes the typical overall behaviour of the material under fusion-relevant conditions.

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Advancements in the helium cooled pebble bed breeding blanket for the EU DEMO: holistic design approach and lessons learned Fusion Sci. Technol., 75 ( 2019 ), pp. 352 - 364 CrossRef View Record in Scopus Google Scholar

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The pebble packed bed can be generated using three methods. The first method consists of running a soft body simulation with STARCCM+®. The resulting packed bed is very realistic, but lacks the conformality with respect the neutronic simulations and is computationally intensive.

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in many fusion blankets. Pebble beds are used in many applications, such as nuclear reactor fuel rods, thermal insulation, heat exchangers, chemical catalysts, automotive catalytic converters, and recently, fusion blankets. The pebble bed consists of two phases: solid phase which is the pebbles and the filling gas. Using pebble beds in

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The pebble-bed reactor ( PBR) is a design for a graphite- moderated, gas-cooled nuclear reactor. It is a type of very-high-temperature reactor (VHTR), one of the six classes of nuclear reactors in the Generation IV initiative . Sketch of a pebble-bed reactor. Graphite pebble for reactor.

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tritium breeder pebble bed for fusion blanket B.P. Gong, H. Cheng, L. Wang, Y.J. Feng, X.Y. Wang Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China [email protected] •Fabrication and characterization of the tritium breeder Li 4 SiO 4 pebbles were summarized. •Mechanical properties and fragmentation behaviors of ceramic ...

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By optimizing the filling process of the pebble bed, the packing factor of the binary-sized pebble bed has reached 0.8, but the uniformity of the binary-sized bed is poor. Key words： Solid tritium breeder blanket Tritium breeder pebble bed Packing behavior Packing factor Discrete element method.

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reactors, with for instance the commissioning of the pebble bed research reactor HTR-10 in China in 2002 and the operation of the 30 MW t hexagonal fuel block HTTR in Japan since 1998. These research programs were built on the experience gained by previous reactor experiments such as Fort Saint-Vrain in the US from 1976 to 1989 and the

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Figure 1.2.1: Cutaway view of magnetic confinement fusion reactor 3 concept. Figure 1.2.2: A simplified vertical cross section of a representative 4 fusion reactor. Figure 3.1.1: Helium-cooled pebble bed concept (exploded view). 9 Figure 3.1.2: View of the plates of the stiffening grid. 10

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Ying a, et al., Status of ceramic breeder pebble bed thermo-mechanics R&D and impact on breeder material mechanical strength, Fusion Eng. Des. 2012, 87:1130–1137 2 . X.Y. Wang, et al., Current design and R&D progress of the Chinese helium cooled ceramic breeder test blanket system, Nucl.

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The use of lithium ceramic pebble beds has been considered in many blanket designs for the fusion reactors. Lithium ceramics have received a significant interest as tritium breeders for the fusion blankets during the last three decades. The thermal performance of the lithium ceramic pebble beds plays a key role for the fusion blankets.

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pebble bed reactors, fusion reactors, and spallation sources. In 2011 he received the German Whistleblower Prize for publications on widely unknown problems and accidents in German pebble bed reactors. R. Scott Kemp is the MIT Class of '43 Associate Professor of Nuclear Science and Engineering and Director of the MIT Laboratory for Nuclear ...

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ELSEVIER Fusion Engineering and Design 27 (1995) 167-178 Fusion Engineer!ng and Design Ceramic pebble bed development for fusion blankets P. Gierszewski a, M. Dalle Donne b, H. Kawamura c, M. Tillack d a CFFTP, Mississauga, Canada b Kernforschungszentrum Karlsruhe, P.O. Box 3640, D-76201 Karlsruhe, Germany c Japan Atomic Energy Research Institute, Oarai, Japan d …

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Answer (1 of 4): There are lots of types of reactors you might consider including fission types: * Traditional light water reactors (which isn't sci-fi at all) * Heavy water reactors * Graphite cooled * Liquid metal cooled * CANDU types (which are still light water) * Breeders including per...

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