# Presentation: 392099

## NEUTRONICS

**Washington DC**
**August 25, 2005**

**NEUTRONICS**

**Mohamed Sawan**
**University of Wisconsin**
**with input from**
**M. Abdou, M. Youssef, L. El-Guebaly, P. Wilson, T. Tautges, E. Cheng**

## Introduction

- Neutronics is a cross-cutting activity that provides support for all VLT elements
- ITER and machines beyond it are nuclear facilities with components operating under severe nuclear environment
- Nuclear analysis required to determine many parameters with significant impact on 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 the ITER nuclear environment

## 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**

## 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, radiation damage, and shielding requirements for sensitive components (e.g., antennas, insulators, mirrors, windows, fiberoptics, detectors, etc.)
- Evaluate radiation streaming through penetrations in diagnostics and ICH systems and determine shielding requirements for personnel access
**Nuclear support for ITER TBM**
- Nuclear analysis and design of DCLL and HCPB US test articles (TPR, nuclear heating, radiation damage, shielding, activation, etc.)
- Strategy, plans, geometrical and operational requirements, design, instrumentation and cost of neutronics tests in ITER-TBM (effort starting under 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, FENDL, EFF, EAF, JENDL, etc) for Fusion Nuclear Analysis
- 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)
- Identifying data needs and interacting with Nuclear Data Developers to Reduce Deficiencies in Nuclear Data Libraries
- Maintaining and distributing state-of-art codes and data

## Descriptions of Key Thrusts (cont’d)

- Provide nuclear analysis and evaluate 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
- Design well-optimized, high performance shield to protect vital components
- Estimate radiation damage to structural components and their service lifetimes
- Address activation and safety concerns and related issues such as radwaste management and waste stream

- Descriptions of Key Thrusts (cont’d)

## Current Spending on Thrusts

|  | 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 | 
$200 K
$0 K |
| Improving nuclear predictive capabilities
  Code development
  International collaboration on integral experiments, measurement techniques
  Data needs and interaction with developers, data processing 
  Maintaining and providing access to codes and data | 
$125 K
$0 K
$75 K
$118 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 |