The earthquake and tsunami in 2001 which hit Japan. Casualties from the earthquake and tsunami, and what it did to the nuclear power plant at Fukushima. Examination of the defense in depth and the details of the nuclear reactor construction and components. How reactors are refueled and why that was important at Fukushima. Time sequence of the events and the work done in the aftermath to keep the core and the spent fuel covered. Blast panels: why they are there and what happened to them. Radiation dose at Fukushima and other places by comparison.