JP Nuclear Materials Subprogramme 2 – Innovative high temperature resistant steels Marta Serrano (repl. by L. Malerba) CIEMAT SP2 Coordinator Workshop with Member States’ Stakeholders, Brussels, 10 Sept. 2014
JP Nuclear Materials Focus on components exposed to the harshest conditions (SFR, LFR) Gen IV Cladding tubes SFR: Temperature : 650ºC Diameter mm Dose : > 150 dpa Thickness mm Stress : up to 100 Mpa Thin tubes several meters long (R.E. Logé, CEA) Requirements: -High temperature (creep) resistance -High swelling resistance -Compatibility with coolant (liquid metal) Candidates: -Oxide dispersion strengthened (ODS) steels -Creep strength enhanced ferritic (CSEF) steels (through termomechanical treatments) Both are also candidate fusion materials
JP Nuclear Materials ODS tubes can be fabricated … ODS cladding tube fabrication has been demonstrated: France, Japan, Russia, US … M. Le Flem (CEA) J. Ribis (CEA)
JP Nuclear Materials … but much R&D remains! Increase ductility (ODS tend to be brittle) Control microstructure (reduce anisotropy of thin-walled tubes) Reduce fabrication cost (powder metallurgy or new routes) Scale to industrial fabrication Fully qualify material for application as cladding …
JP Nuclear Materials Research in SP2 Monitoring national programmes European activities on ODS/Enhanced creep alloys “Catalogue” of available materials / producers Exploring new fabrication routes: ( FP7/MATTER ) Improvement of powder metallurgical process and optimization of final thermo- mechanical treatment Conventional steel making techniques (introducing the oxide particles in the melt) Spark plasma sintering techniques ODS cladding tubes characterization ( FP7/MATISSE, FP7/GETMAT follow-up ) Microstructural stability under high temperature and irradiation Anisotropy studies (biaxial mechanical testing) Screening activities under accidental scenario
JP Nuclear Materials ODS PP Capitalization of results within SP2 GETMAT (~1.5 M€ / 50%) ODS fabrication & characterisation MATTER (~0.5 M€ / 50%) Optim. fabrication route MAtISSE (~450 k€ / 50% k€ in-kind) Clad. tube characterisation JPNM/SP2 (~40 PY/Y)
JP Nuclear Materials Next steps & links Identify new industrial partners Dissemination & international cooperation (INERI-USA, IAEA, NEA) Consider other innovative steels: CSEF Validated conventional and/or cheaper fabrication routes Production at industrial scale Optimised ferritic and martensitic ODS cladding tubes: controlled microstructure & mechanical properties Same materials as for fusion: operating conditions & form differ, but fabrication problems and requirements of radiation resistance are similar High temperature resistance is of use also for other energy technologies links with other EERA JPs, EMIRI, ESTEP (for fabrication), …
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