This lecture covers various topics in nuclear engineering, including reactor technology, nuclear physics, fuel cycle, reactor physics, reactor kinetics, thermal hydraulics, radiation protection, nuclear safety principles, design basis accidents, generation-IV reactors, and waste treatment. The instructor discusses the emergency core cooling system, large-break LOCA, hydroaccumulators, containment design, BWR heat removal systems, severe accidents, core flooding tank, and safety analysis assumptions. The lecture also delves into LB-LOCA sequences, containment isolation, core heatup phase, temperature escalation phase, core melt progression, and engineered safety features of a PWR. The Fukushima Daiichi nuclear accident is analyzed, highlighting the severe consequences and lessons learned.