The Proliferation Resistance and Physical Protection Working Group (PRPPWG) was established to develop, implement, and foster the use of an evaluation methodology to assess Generation IV (Gen-IV) nuclear energy systems with respect to the GIF proliferation resistance (PR) and physical protection (PP) goal:
“Generation IV nuclear energy systems will increase the assurance that they are very unattractive and the least desirable route for diversion or theft of weapons-usable materials and provide increased physical protection against acts of terrorism.”