This NIA paper by Research Director Dr. Patrick White describes progress by the Nuclear Regulatory Commission (NRC) staff to develop the proposed 10 CFR Part 53 regulatory framework, how the NRC staff and the Commission have incorporated the concept of risk metrics in the proposed rule, the history of risk metrics used by the NRC as a part of licensing activities, the proposed use of a comprehensive risk metric to support technology-inclusive, risk-informed and performance-based (TI-RIPB) regulation in Part 53, and key considerations for the development and implementation of comprehensive risk metric requirements and guidance for NRC staff and prospective applicants. Derivations for the numerical values for the existing NRC’s risk metrics (quantitative health objectives and light water reactor surrogate risk objectives) are provided to highlight significant conservatisms and assumptions in the existing surrogate risk objectives.