Advanced nuclear technologies represent a dramatic evolution from conventional reactors in terms of safety and nonproliferation, and the cost estimates from some advanced reactor companies—if accurate—suggest that these technologies could revolutionize the way we think about the cost, availability, and environmental consequences of energy generation. Comparing the cost of future nuclear technologies to current designs (or other generation technologies) requires capturing cost data for advanced nuclear plants in a standardized, comprehensive manner. Using the plant cost accounting framework developed by the Generation IV International Forum, LucidCatalyst and EON created a cost model for this study that includes all potential cost categories for an nth- of-a-kind (NOAK) nuclear plant.