TBM Structure, Materials and Fabrication Collaboration Issues

1. TBM Structure, Materials and Fabrication Collaboration Issues R.J. Kurtz1, and A.F. Rowcliffe2 1Pacific Northwest National Laboratory 2Oak Ridge National Laboratory ITER TBM Planning & Costing Meeting March 9, 2006

2. Existing and Proposed Fusion Materials Collaborations - I • IEA Implementing Agreement on Fusion Materials • Existing - working groups on RAFM steels, SiC composites, vanadium alloys, ceramic insulators, Be technology, SSTT, and theory & modeling are in place. • Proposed - development of a qualified materials data base, development of design rules and acceptance criteria for TBMs. • DOE/MEXT • Existing - determine the effects of radiation on candidate SiC composites for FCI applications (18J experiment). • Proposed (post JUPITER-II) - explore the synergistic effects of neutron and tritium radiation on bonded dissimilar materials (Be/RAFM, W/RAFM, RAFM HIP & weld joints, SiC/SiC).

3. Existing and Proposed Fusion Materials Collaborations - II • DOE/JAEA • Existing - determine the effects of neutron radiation on RAFM and cast austenitic steels at 300 - 500°C to 1-5 dpa (15J/16J & rabbit experiments). • Proposed - evaluate the radiation performance of new heats of laboratory prepared F82H HIP and weld joints, evaluate the radiation performance of commercially produced joints. • US/EU • Existing - determine the effects of He on microstructure and mechanical properties of RAFM steels via isotopic tailoring (54Fe). • Proposed - see next two viewgraphs.

4. Potential US/EU TBM R&D Collaborations - I • Development of structural design criteria and stress analysis methods including flaw tolerance (NDE detection limits) and lifetime analyses. • Development of standardized test methods for evaluating the integrity and mechanical properties of materials, including dissimilar metal joints, creep-fatigue, etc. • Development of the materials data base (unirradiated and irradiated properties) on Eurofer base metal at 500-550°C and joints. • Advanced characterization techniques for evaluating HIP fabricated structures (NDE and destructive techniques). • Development of in-situ diagnostics for TBMs beyond simple temperature and coolant flow measurements.

5. Potential US/EU TBM R&D Collaborations - II • Development of adherent corrosion-resistant oxide films on structural materials such as superalloys, some of which may serve as tritium permeation barriers in piping and ancillary equipment. • Investigation of LiPb compatibility and RAFM steel/LiPb stress corrosion cracking issues. • Assessment of alternative mockup fabrication techniques. • SiC composite fabrication techniques, physical and mechanical properties. • Joining techniques for Be/ferritic steel and Be/W (divertor applications). • Characterization of as-fabricated ceramic breeder pellets and investigation of ceramic pebble bed thermomechanics.

6. Potential TBM Materials Collaboration Topics • RAFM steel fabrication technology development (see next viewgraph for caveats). • Small specimen test technology - test methods for property evaluations - particularly joints. Development of a qualified materials data base. • Design rules and acceptance criteria (scope of US TBM effort assumes collaboration). • Joining of Be to RAFM steels (HIP, braze, plasma spray). • Nondestructive examination techniques and procedures. • Corrosion barriers, LiPb/RAFM steel compatibility and SCC?

7. Collaboration Issues • Work partitioning (e.g. RAFM steel fabrication technology development) • Development of different components (FW structure, internal cooling plates, manifolds). • Development of alternative fabrication routes (HIP versus investment casting). • Support process development by performing radiation experiments and PIE. • Technology sharing • Involvement of industry may require nondisclosure agreements - protection of proprietary information. • State-of-the-art technology may be subject to export controls. • Need to develop industrial capacity to manufacture components for future fusion power systems.