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Various Strategies for DCLL in US Technology Program

This text outlines different scenarios for the deployment and testing of Dual-Coolant Lithium Lead (DCLL) Test Blanket Modules (TBMs) in the US technology program for fusion energy. It discusses the potential benefits and costs associated with each scenario and highlights the need for further definition of the "Good" and "Optimum" scenarios for cost evaluation.

garyfarmer
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Various Strategies for DCLL in US Technology Program

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  1. Various Strategies for DCLL in the US Technology Program Return on ITER Investment Cost Spectrum Poor ITER utilization (Lowest Cost Scenario) - Support EU HCLL effort, no independent DCLL TBM e.g. Contribute R&D in areas of unique US expertise (e.g. MHD, Tritium, etc.) in return for access to data – little or no other parallel R&D Good ITER utilization (Moderate Cost Scenario) – Highly shared and staged TBM effort with small, independent DCLL TBMs e.g. Small number of TBMs sharing space and ancillary systems with EU-HCLL e.g. Strong partnership with China and possibly Korea sharing R&D and TBM costs Optimum ITER Utilization (Full Resource Scenario): Full US TBM program (comparable to EU and Japan) coupled in parallel with R&D on longer term issues e.g. day-1, half-port DCLL testing with independent loops and multiple specialized TBMs while working on tritium strippers, advanced SiC, high temperature HX and TX tubes. We need to better define more completely the “Good” and “Optimum” scenarios for the cost evaluation

  2. DCLL TBM variables that affect cost of TBM development and testing program • Number and size of TBMs (quarter or half port, 2 to 6 units) • Operation temperature (for TBM, ancillary equipment and diagnostics) • Choice of materials in TBM and ancillary equipment • Complexity and number of diagnostic measurement hardware and interfaces • Standardization and sharing of QA testing facilities and ancillary equipment • Sharing tasks with other parties • Sharing tasks with similar efforts within ITER

  3. The current DCLL DDD documentation lies between Good and Optimum ITER utilization • The baseline assumption underlying the current US planning and TBWG documentation is: • a series of vertical half-port DCLL-TBMs, • with dedicated ancillary equipment systems in transporter casks behind the bioshield and in space in the TCWS building, • during the period of the first 10 years of ITER operation. • The strategy for US testing progresses from basic structural and MHD validation tests to more integrated module tests as a function of the ITER operational phases • It should be noted that this test program is developed assuming successful testing in previous phases and must remain flexible to deal with negative results • The US is actively looking for and developing collaboration and sharing opportunities with all parties. • The US ITER-TBM team has evolved a strategy with considerable flexibility to adjust to different budget scenarios

  4. US DCLL TBM Testing Schedule during first decade of ITER operation

  5. DCLL TBM R&D and Deployment Schedule for Current DDD Planning

  6. DCLL TBM Program Requirements • Key Near Term R&D (needed over next 4 years) • Feasibility and Design Issues (experimental and modeling) • Thermofluid MHD models: pressure drop, velocity profiles, flow distribution, and temperatures • Basic SiC corrosion in non-isothermal system • FCI response and effectiveness in chemical and thermofluid system • Evolving conceptual design of Integrated and EM/S modules (modeling and analysis) • Validated thermofluid MHD flow models • Validated Helium circulation scheme and FW/structure cooling • Complete 3D Neutronics model • Complete 3D Structural behavior model • Validated Tritium behavior model (with EU) • Development of fabrication techniques for full scale TBM (with EU) • Development of required purification and tritium removal systems from all coolants (with EU) • Accepted safety analysis for ITER operation • Evolving testing plan (analysis) • Integrated Testing and QA (begin in 2 years) • Specification, design and fabrication of needed integrated testing facilities (US, China, EU) • Mockup design and fabrication and testing program • TBM and diagnostic design and fabrication  (begin in 6 years) • Final Engineering Design of TBMs (or 4 to 6 articles) • Fabrication of TBM structure (staged over several years, first one to begin by FP-4) (with EU) • Ancillary Loop Equipment (Helium loop and PbLi loop components, tritium systems) (with EU, China) • Diagnostic systems for TBM, Ancillary loops and computer interfaces (with EU, China) • Integration into Test Port (all TBM, with their associated ancillary equipment and diagnostics)

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