Includes bibliographical references (pages 191-199). Includes bibliographical references.

"The U.S. Congress asked the National Academy of Sciences to conduct a technical study on lessons learned from the Fukushima Daiichi nuclear accident for improving safety and security of commercial nuclear power plants in the United States. This study was carried out in two phases: Phase 1, issued in 2014, focused on the causes of the Fukushima Daiichi accident and safety-related lessons learned for improving nuclear plant systems, operations, and regulations exclusive of spent fuel storage. This Phase 2 report focuses on three issues: (1) lessons learned from the accident for nuclear plant security, (2) lessons learned for spent fuel storage, and (3) reevaluation of conclusions from previous Academies studies on spent fuel storage"--Publisher's description. Introduction -- Fukushima Daiichi nuclear accident: lessons learned for spent fuel storage -- Fukushima Daiichi Nuclear accident: lessons learned for nuclear plant security -- Reevaluation of findings and recommendations from previous NAS reports -- Security risk assessment -- Loss-of-coolant events in spent fuel pools -- Expedited transfer of spent fuel from pools to dry casks -- References -- Appendix A: Committee and staff biographies -- Appendix B: Presentations -- Appendix C: Conversions and units -- Appendix D: Acronyms.