Overview of reactor systems and operational environments for structural materials in Gen-IV fission reactor

A summary of the operating conditions leading to materials challenges for candidate reactor materials has been provided for the six Gen-IV Reactor concepts. This includes two liquid metal cooled fast reactors (SFR and LFR), two helium cooled reactors (VHTR and GFR), the molten salt cooled reactor (MSR), and the supercritical water cooled reactor (SCWR). The reactor concept with the largest experience base is the SFR although research is underway to further the development of the others. The following chapters provide more detail on development and understanding of improved materials leading to further advancement of these advanced reactor concepts. (authors)