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The effect of the orientations of pebble bed in Indian HCSB Module Paritosh Chaudhuri

The effect of the orientations of pebble bed in Indian HCSB Module Paritosh Chaudhuri Institute for Plasma Research Gandhinagar, INDIA CBBI-16, 8 - 10 Sept. 2011, Portland , USA. 1.) Introduction 2.) H elium C ooled C eramic B reeder( HCCB ) concept

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The effect of the orientations of pebble bed in Indian HCSB Module Paritosh Chaudhuri

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  1. The effect of the orientations of pebble bed in Indian HCSB Module Paritosh Chaudhuri Institute for Plasma Research Gandhinagar, INDIA CBBI-16, 8- 10 Sept. 2011, Portland, USA

  2. 1.) Introduction 2.) Helium Cooled Ceramic Breeder(HCCB) concept 3.) Radiation Heat Transfer Analysis using ANSYS 4.) Performance Analysis 5.) Summary, Conclusions and Future Work Outline

  3. Indian Blanket Concepts • Lead-Lithium cooled Ceramic Breeder (LLCB) • Tritium Breeder: Lithium Ceramic pebbles; PbLi • Coolant: PbLi (multiplier and breeder); • FW coolant: Helium Gas; • Structural Material: Reduced Activation FMS • Purge gas: Helium, used for T extraction from CB (LLCB TBM in one half of ITER port) • Helium Cooled Ceramic Breeder (HCCB) • Tritium Breeder: Lithium Ceramic pebbles; • Multiplier : Beryllium Pebbles; • Coolant : helium gas; • Structural Material: Reduced Activation FMS • Purge gas: Helium T extraction from CB (to participate as TBM Partner)

  4. Helium Cooled Ceramic Breeder(HCCB) concept

  5. HCSB Concept (Toroidal-Radial Orientation) • Features: • Similar to other solid breeder concepts. • With slight variance in the Tritium Breeder and Neutron multiplier bed design (Radial increase in the breeder bed thickness) Objective: -To increase the tritium breeding by accommodating more breeder material (with optimization of multiplier material volume) - To minimize the radial temperature gradient in the pebble beds

  6. Grid-Plate Assembly Top-Plate Assembly Inner Back-Plate Outer Back-Plate Pipes (inlets & outlet) First-Wall Breeder Units Supports Keys Bottom-Plate Assembly Flexible supports HCSB TBM (Exploded View)

  7. Input: Neutronic heat generation in HCSB TBM

  8. Performance Analysis

  9. Pebble Bed Arrangement (Toroidal-Radial) Pebble will settle down at the bottom, keeping some void space between the pebbles and top cooling plate.

  10. Temperature Distribution gap with radiative HT no gap gap, no radiation Max. temp. 557 CMax. temp. 813 CMax. temp. 928 C

  11. Temperature Distribution at different Locations

  12. Temperature Distribution in HCSB TBM

  13. Temperature Distribution (Analytical Analysis)

  14. Poloidal-Radial From Toroidal-Radial Poloidal-Radial orientation Toroidal-Radial

  15. Poloidal-Radial Surface Area: 0.097 m2 Toroidal-Radial Comparison between two different orientations

  16. Temperature Distribution in Poloidal-Radial pebble bed Toroidal-Radial view Toroidal-Poloidal view

  17. Transient Thermal Analysis on HCSB TBM

  18. Summary and Conclusions • In Toroidal-Radial orientation of pebble bed, the area of the cooling plate (heat transfer area) attached to the pebble bed is very large. • If the pebbles are settle down at the bottom, creating a finite gap between the cooling plate and the top surface of the pebbles, the large heat transfer area can not involve in transferring heat from CB to coolant. This leads to increase in CB temperature. • In Toroidal-Radial orientation of pebble bed, settling down of pebbles would not effect the heat transfer between the CB and coolant.

  19. Future Work • Effect of the He purge gas to be introduced in the Radiative heat transfer analysis. • Simulation and experimental comparison between various packing arrangements. • Safety analysis of Blanket Modules. • Fabrication of small scale mock-ups to demonstrate structural and pebble bed integrity.

  20. Thank you

  21. Backup Slides

  22. HCSB Concept Schematic of HCCB moduleand breeder unit

  23. HCSB Concept 3/3 2-D representation of radial-poloidal cross section of a breeder unit

  24. First Wall of HCCB HCSB TBM (Preliminary Design) 2/3 Ceramic Breeder: Li4SiO4, Li2TiO3 (pebble form) Multiplier: Beryllium / Beryllides Structure: RAFMS Coolant: Helium Purge Gas: Helium + %H2 FW is cooled by two counter-flowing helium circuits. Circuit 1 of the He flow channels have openings at the edge face of the FW and Circuit 2 has thechannel openings on the inner face of the FW.

  25. FW Slot In C-10 In C-9 Out C-10 In C-15 Out C-9 Out C-15 In C-8 In C-13 Out C-7 Out C-8 In C-6 In C-7 In C-5 Out C-6 In C-12 Out C-5 Out C-12 In C4- In C-11 In C-3 Out C-4 In C-2 Out C-3 Out C-14 Out C-2 Out C-16 In C-14 Out C-1 In C-16 In C-1 FW Slot Helium cooling circuits for FW - Total number of channels: 64 - Number of circuits: 2 - Number of passes per circuit: 8 - Number of channels per passes: 4 - Channel dimension: 20x20 mm - Pitch: 25.5 mm - Rib thickness: 5.5 mm

  26. Helium Flow path in HCCB

  27. Helium Flow Distribution in HCCB

  28. Grid Plate Assembly (HCSB TBM)

  29. Top-Plate 4mm-thk Top-Plate Assembly 538 R30 First-Wall 424 Bottom-Plate 4mm-thk 85 83 83 Inlet 83 Outlet 83 60 101 Inlet 62 Helium-flow path Channels 4mm-thk Top Plate assembly for HCSB TBM

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