VLT MeetingWashington DCAugust 25, 2005

NEUTRONICS

Mohamed Sawan

University of Wisconsinwith input from

M. Abdou, M. Youssef, L. El-Guebaly, P. Wilson, E. Cheng

IntroductionNeutronics 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 environmentNuclear 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

Key Neutronics Thrust Areas

1) Nuclear analysis for ITER procurement packages

2) Nuclear support for ITER TBM3) Improving nuclear predictive

capability4) Nuclear analysis for advanced

designs in future facilities

Descriptions of Key Thrusts1) 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.

2) 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)

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)

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

Descriptions of Key Thrusts (cont’d)

Current Annual Spending

Nuclear analysis for ITER procurement packages Full ITER modeling

Diagnostics

ICH

Mod.18

$0 K

$0 K

$0 K

$0 K

Nuclear support for ITER TBM Nuclear Analysis and Design of test articles

Nuclear Test Plan, design, instrumentation and cost

$200 K

$0 K

Improving nuclear predictive capabilities Code development

Data needs and interaction with developers, data processing

Maintaining and providing access to codes and data

International collaboration on integral experiments, measurement techniques

$125 K

$75 K

$118 K

$0 K

Nuclear analysis for advanced designs in future facilities $150 K

Current Spending on Thrusts

Characterization of thrusts to VLT missions

Support US Contribution to ITER

Additional R&D needed for ITER to be successful

ITER utilization as test bed (TBM, etc)

Next generation technology (for current and future machines)

Longer Term R&D (for machines beyond ITER)

Nuclear analysis for ITER Procurement Packages

x x

Nuclear support for ITER TBM

x x

Improving nuclear predictive capabilities

x x x x x

Nuclear Analysis for advanced designs in future facilities

x x