German Contribution to Item 2 of the Agenda “Status of ... - IAEA

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Lehrstuhl für Reaktorsicherheit und –technik Univ.-Prof. Dr. rer. nat. Hans-Josef Allelein Institut für Energie- und Klimaforschung Nukleare Entsorgung und Reaktorsicherheit (IEK-6) Pebble Flow in SHUFLE • The laminar flow paths of fuel pebbles in SHUFLE are simulated by propagating smaller voids which are created at the core bottom when discharging pebbles • SHUFLE processes flow lines measured experimentally of created by a code based on real physics (e.g. DEM) • Main purpose is to display fuel movement in larger framework (e.g. HCP) Fig.: Measured flow paths [1] Fig.: Silo drainage [2] [1] Yang, X.: Experimental Investigation on Feasibility of Two-Region-Designed Pebble-Bed High-Temperature Gas-Cooled Reactor, INET, 2008 [2] Kamrin K., Rycrof C., Bazant M., The stochastic flow rule: a multi-scale model for granular plasticity, MIT. Cambridge, 2007 H.-J. Allelein TWG-GCR-23 March 5-7, 2013, Vienna 38
Lehrstuhl für Reaktorsicherheit und –technik Univ.-Prof. Dr. rer. nat. Hans-Josef Allelein Institut für Energie- und Klimaforschung Nukleare Entsorgung und Reaktorsicherheit (IEK-6) Validation Setup • ANABEK test facility (Siemens-Interatom) • Pebble bed surface is covered with marked test spheres • Pebble bed is shuffled as long as marked spheres are within the vessel • Result: residence time distribution (RTD) „test spheres“ H.-J. Allelein TWG-GCR-23 March 5-7, 2013, Vienna 39
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German Contribution to Item 2 of the Agenda “Status of ... - IAEA

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