VLT Meeting Washington DC August 25, 2005

1. NEUTRONICS Mohamed Sawan University of Wisconsin with input from M. Abdou, M. Youssef, L. El-Guebaly, P. Wilson, E. Cheng VLT Meeting Washington DC August 25, 2005

2. Introduction • Neutronics is a cross-cutting activity that provides support to all VLT elements • ITER and machines beyond it are nuclear facilities with components operating in severe nuclear environment • Nuclear analysis required to determine many parameters with significant impact on the performance of these fusion facilities (tritium breeding, nuclear heating, radiation shielding, streaming, radiation damage, transmutation, radioactivity, decay heat, radwaste, personnel accessibility) • Need to upgrade neutronics predictive capabilities for efficient and accurate determination of nuclear parameters • Top priority in next 5 years is to provide needed neutronics support for the US ITER procurement packages (ICH , Diagnostics, Module 18, …) and the ITER TBM program to ensure that US delivers components with great confidence in their successful performance in ITER nuclear environment

3. Key Neutronics Thrust Areas • Nuclear analysis for ITER procurement packages • Nuclear support for ITER TBM • Improving nuclear predictive capability • Nuclear analysis for advanced designs in future facilities

4. Descriptions of Key Thrusts • Nuclear analysis for ITER procurement packages • Collaborate with ITER team on generating a global geometrical model of the entire machine with detailed source profile for nuclear analysis • Provide neutronics support for design and construction of ICH, diagnostics, and module 18 procurement packages • Perform 3-D neutronics calculations using the full ITER model to determine nuclear heating and radiation damage and shielding requirements for sensitive components (e.g., antennas, insulators, etc.) • Evaluate radiation streaming through penetrations in diagnostics and ICH systems and determine adequate shielding for personnel access. • Nuclear support for ITER TBM • Nuclear analysis and design of US test articles for DCLL and HCPB (TPR, nuclear heating, radiation damage, shielding, activation, etc.) • Set strategy, plans, geometrical and operational requirements, design, instrumentation and cost of neutronics tests in ITER-TBM (effort has started under the IEA Implementing Agreement on the Co-operative Program on the Nuclear Technology of Fusion Reactors- Neutronics)

5. Descriptions of Key Thrusts (cont’d) 3) Improving nuclear predictive capabilities • Developing improved codes for nuclear analysis. Integrating the CAD, neutronics and activation codes in a single system to allow efficient and accurate determination of nuclear parameters in complex system • Disseminating, acquiring, and processing up-to-date nuclear data (ENDF/B-VII, FEND, EFF, EAF, JENDL, etc) for Fusion Nuclear Analysis • Identify data needs and interact with Nuclear Data Developers to Reduce Deficiencies in Nuclear Data Libraries • Maintaining and distributing state-of-art codes and data • International collaboration on Integral Neutronics Experiments to validate codes and data using existing 14 MeV facilities (FNS, FNG, etc) for mockups of ITER TBM and advanced designs • International collaboration on Measurement Techniques Development and Inter Comparison (heating, spectra, activation measurement)

6. Descriptions of Key Thrusts (cont’d) 4) Nuclear support for advanced designs in future fusion devices • Provide nuclear analysis and assess advanced design options for future devices beyond ITER(CTF, DEMO, Power plants) that have potential for achieving tritium self-sufficiency, efficient extraction of high grade heat and safe and reliable operation under elevated flux and fluence conditions

7. Current Spending on Thrusts

8. Characterization of thrusts to VLT missions