This chapter: (1) identifies the structural integrity issues in the ASME Boiler & Pressure Vessel Code, including Section II, Section III, Subsection NH (Class 1 Components in Elevated Temperature Service), Section VIII, and Code Cases that must be resolved to support licensing of Generation IV (Gen IV) nuclear reactors, if for very high temperature gas-cooled reactors; and (2) describes how the Code addresses these issues; and (3) identifies the needs for additional criteria to cover unresolved structural integrity concerns for very high temperature service.