This report presents the reflections of members of the MIT Nuclear Science and Engineering faculty on the accident at Fukushima, and is offered as a contribution to the debate on the implications of the accident for the nuclear industry. Our purpose is twofold: we identify and discuss technical issues arising from the accident; and we begin a review of how the lessons learned can be used to improve the safety of current and future plants. The information is organized in six sections: “Emergency Power following Beyond-Design-Basis External Events”, “Emergency Response to Beyond-Design-Basis External Events”, “Containment”, “Hydrogen Management”, “Spent Fuel Pools”, “Plant Siting and Site Layout”. For each area, we present key issues observed at Fukushima and corrective actions that should be evaluated for implementation in current and future plants.