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ITER In-Vessel Coils (IVC) Interim Design Review Thermal Structural FEA of Feeders A Brooks July 27, 2010 July 26-28, 20101ITER_D_353BL2
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Middle and Lower ELM Feeders Analysis Status Overview Geometry Modeling & Meshing –Feeders –Background Field Coils Material Properties Boundary Conditions –Temperature –Implied Structural Supports Loading –Ohmic Heating –Nuclear Heating –Lorentz Forces –Water Pressure Preliminary Results Stress Allowables and Acceptance Criteria (TBD) Ongoing Analyses Issues and Resolution Plan 2ITER IVC IDR 26-28 July 2010
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Feeder Geometry Modeling Interface is up to but not including Couplings CATIA Model Exported as Step File and Imported into ProE 3ITER IVC IDR 26-28 July 2010
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Modeling Modeling used section data and sweeping curves from CAD Model to create mesh using FORTRAN Codes 4ITER IVC IDR 26-28 July 2010
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PF and TF Field Drivers PF Coils Modeled Explicitly in ANSYS TF Coil uses 1/R from Center Filament to Provide 5.3T at 6.2m Initial Scenario Data Used Other Scenarios need to be considered 5ITER IVC IDR 26-28 July 2010
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Material Properties Preliminary Analysis – Using Linear Properties 6ITER IVC IDR 26-28 July 2010
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Boundary Conditions Preminary Analyses Assumed MgO bonded to Cu Tube and SS Sheath –Impact of debonding to be addressed using low shear modulus Supports not modeled explicidly, constraints added at support locations –Initial runs assumed tee fully bonded to VV structurally but isolated thermally (conservative?) –Tube Ends Fully Constrained at Couplings (assumes support will exist) Only Cooling from Water Tubes –ID held at fixed temperature: 100C at inlet, 130 at outlet –Radiation from outer surfaces to VV and surroundings not included –Conduction cooling to VV ignored 7ITER IVC IDR 26-28 July 2010
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Loading Ohmic Heating 15 kA DC Current in Cu –Directions chosen to induce worse moments of Tee Section – Top Turns in one direction, bottom opposite –Note: Since Temperature is constrained at ID (perfect cooling) Ohmic heating has only small effect on Cu transverse temperature gradients. Nuclear Heating assumes 1.4 MW/m2 at Plasma facing surface and decays as e -x/ where cm Lorentz Forces from 15kA crossed with local field from OH/PF and TF (see plots) 4.4 MPa (638psi) Water Pressure in Tubes 8ITER IVC IDR 26-28 July 2010
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Applied Nuclear Heating Heat Generation Rates 9ITER IVC IDR 26-28 July 2010
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Resulting Steady State Temperatures 10ITER IVC IDR 26-28 July 2010 Mid Section of Feeders
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Resulting Steady State Temperatures at ends of Feeder Tees ITER IVC IDR 26-28 July 201011 With Cold Inlet Water in Bottom Turn, Hot Spot is on Top With Cold Inlet Water in Top Turn, Hot Spot is on Bottom
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Water Pressure in Tubes 12ITER IVC IDR 26-28 July 2010
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Toroidal Field 13ITER IVC IDR 26-28 July 2010 1/R Field plus self field from feeders
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Vertical Field 14ITER IVC IDR 26-28 July 2010 Without PlasmaWith Plasma Initial Results ignored plasma field, but for outboard components vertical field is increased
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Radial Field 15ITER IVC IDR 26-28 July 2010 Without PlasmaWith Plasma As is radial field
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Global Von Mises Stresses 16ITER IVC IDR 26-28 July 2010
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Global Displacements ITER IVC IDR 26-28 July 201017
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ITER IVC IDR 26-28 July 201018 EM Thermal EM vs Thermal Loads Impact on Von Mises Stress View from Back
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ITER IVC IDR 26-28 July 201019 EMThermal EM vs Thermal Loads Impact on Displacements
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Von Mises Stress at Mid Section 20ITER IVC IDR 26-28 July 2010 Temperature Gradient Between base and VV And assumption of fixed Support causes large stress
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Von Mises Stress at Lower End Section 21ITER IVC IDR 26-28 July 2010 Local stress concentration at weld
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Von Mises Stress in Tubes at Mid ELM 22ITER IVC IDR 26-28 July 2010 High Outer fiber stress From bending of Unsupported tube
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Von Mises Stress at Mid Section with Perfect Thermal Contact to VV ITER IVC IDR 26-28 July 201023 Stress in SS base drops significantly 278=>150 MPa
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ITER IVC IDR 26-28 July 201024 Von Mises Stress at Lower Section with Perfect Thermal Contact to VV Local stress concentration at weld still persists
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Von Mises Stress at Lower Section with Perfect Thermal Contact to VV ITER IVC IDR 26-28 July 201025 Only minor change in Outer fiber stress From bending of Unsupported tube
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Stress Allowables and Acceptance Criteria Need to ensure compliance with Appendix D of the In-Vessel Component Criteria specifies the Stress Acceptance Criteria. Not there yet for unsupported tubes and welds. MgO TBD ITER IVC IDR 26-28 July 201026 Calculated Stress in Fully Supported Section (left) SmEndurance Limit (No Defects) Conductor, Intermediate Strength CuCrZr 74 MPa133 MPa96 MPa Conduit, 316LN131 MPa147 MPa196 MPa Support, 316LN150 MPa147 MPa196 Mpa MgO163 MPa??
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Ongoing Analyses Alternate Support Concepts need to be evaluated to reduce stresses –For Tee –For Tubes Additional Load Cases need to be identified and run –Normal Operating Scenarios –Disruption Scenarios –Transient Response Characterization of MgO, which is in progress, needs to be folded into analyses –Material Properties –Interface behavior with Cu Tube and SS Casing ITER IVC IDR 26-28 July 201027
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Issues and Resolution Plan IssueResolutionPre/Post October High Stresses in unsupported region of tubes Design will need to provide additional supports while not over constraining and restrict thermal expansion Pre High Stresses in WeldsRefine modeling and/or increase weld section. Solving above support of tubes may also relieve local stress Pre High Stresses in Base Support if poor thermal connection to VV while rigidly held Need to ensure supports to VV provide adequate heat sinking. Pre Uncertainty in MgO properties and behavior Characterization of MgO from testing underway needs to be folded into analysis Pre? 28ITER IVC IDR 26-28 July 2010
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