Establishing Interface Requirements for "Major Portions" Standard Design Approval

This report provides guidance on how advanced reactor vendors can define interface requirements between portions of a plant design when using the “standard design approval” process to seek Nuclear Regulatory Commission review of a major portion of their design. This facilitates a modular and staged approach to licensing that can be useful for some advanced nuclear programs. This report builds on prior NIA work to identify the opportunity associated with the standard design approval process and to provide guidance on how to exercise it.