Impact of modularization and site staffing on construction schedule of small and large water reactors

• Methodology for estimating the construction duration of nuclear projects. Construction schedules 3 large and small water reactors are estimated. Smaller more insensitive to staffing constraints. sensitive modularization assumptions. Recent project in US Europe were 2.5x their original estimates due productivity misses, supply chain challenges, hiring constraints, other issues. Small modular proposed as a remedy. will require one fourth third person-hours labor leverage common chains, putting less strain on each step process. This study presents methodology projects, so sensitivity concepts constraints can be analyzed. The builds previous overnight capital cost estimation tool Gantt chart out 226 tasks. genetic algorithm assigns resources task minimize time subject peak rate results consistently within 15% seven benchmark durations. Under tighter increased 42% average only 3% reactors. Modularization systems structures reduced durations 60%, but it assumptions because compact layout, power specific ($/kW) was higher, total financial impact smaller costs lower.