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NERI-C Contract:Radioactive Particle Tracking for PBR

NERI-C Contract:Radioactive Particle Tracking for PBR. Introduction of NERI-C contractMission in CEAR NCSUSome related previous workExperiment set upExperiment resultsPebble bed Reactor Model (KL). Program on Very High Temperature Reactors. University of Missouri-ColumbiaSudarshan K. loyalka

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NERI-C Contract:Radioactive Particle Tracking for PBR

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    1. NERI-C Contract:Radioactive Particle Tracking for PBR

    2. NERI-C Contract:Radioactive Particle Tracking for PBR Introduction of NERI-C contract Mission in CEAR NCSU Some related previous work Experiment set up Experiment results Pebble bed Reactor Model (KL)

    3. Program on Very High Temperature Reactors University of Missouri-Columbia Sudarshan K. loyalka, PI Washington University, St.Louis Muthana al -Dahhad NCSU, Raleigh Robin P. Gardner

    4. The Pebble Bed Reactor Graphite-moderated, gas-cooled. One of the six classes nuclear reactors in the Generation IV (after 2030).

    5. Program Objectives Fission product (FP) transport phenomena. (experiment) Measure the accumulation of condensable radionuclides. Dust transport computational simulation and experiment. Component materials measurement (bare and oxidized) Particles flow motion pattern experiment and model.

    6. PBMR

    7. Gatt’s Experiment

    8. Gatt’s experiment Conclusion useful for us 1.The optimum pebble bed height would approximately 27.5 in with the above pebbles. 2. The optimum base angle would be 45’ or greater. Then with 25’ 3.Seeding radius from 3-12 in the transit number mean and Std deviation are relatively unaffected. but 12-14.5 vessel wall region would sharply affected by R. 4. Recirculation rate from one per two minutes to 50,000 per minute has little or no effect on the pebble flow pattern

    9. Pebble flow experiment in MIT 1 to 10 ratio of the actual size.(30cm/D;6mm/d) Half model and 3-D model

    10. Pebble flow experiment in MIT Useful conclusions Streamlines in the straight section are not significantly affected by changes in cone angle, refueling pattern, or drainage hole diameter. Material properties, include friction, do not appear strong influence the flow pattern.

    11. 3- D particle tracking system in NCSU

    12. Model PBR

    13. Experiment results and targets An activated identical pebble is put in an known initial position from the top of the bed. Particle tracking system locks the activated pebble, then starts the recirculating system. Tracking the path of the target pebble. Sufficient data for pebbles flow patterns The original positions Geometry effects Packing types

    14. References A new method for radioactive paticle tracking. S. Ashraf Ph.D thesis 2005 Flow of spheres and near spheres in cylindrical vessels, F.C. Gatt 1970. A research proram on very high temperature reactors(VHTRs) S. K. loyalka, M. al-Dahhad, and R.P. Gardner,2007 Pebble flow experiments for pebble bed reactors. A. C. Kadak,M.Z. Bazant,2004

    16. Introduction to Granular Dynamics Kinematic Model Continuum Mechanics Discrete Finite Method (DEM) Outline the model of Packing Pebbles Tracking

    18. Introduction to Granular Dynamics Large number of individual solid particles Classical interactions between particles Inter-particle forces only during contact Interaction forces are dissipative Friction, restitutional losses from collisions Qualitative similarity of fluid, gas and solid states

    20. Introduction to Granular Dynamics

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