United States Nuclear Regulatory Commission - Protecting People and the Environment
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Post-Fukushima Safety Enhancements

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Image of a generic nuclear plant highlighting the different Post Fukushima Safety Enhancement including mitigation strategies, flex equipment, containment venting systems, spent fuel pool instrumentation, emergency preparedness and flooding and seismic defense Mitigation Strategies web page hyperlink Containment Venting System web page hyperlink Flooding and Seismic Defense web page hyperlink Flooding and Seismic Defense web page hyperlink Spent Fuel Pool Instrumentation web page hyperlink Emergency Preparedness web page hyperlink Flex Equipment web page hyperlink Flex Equipment web page hyperlink


On March 11, 2011, a 9.0-magnitude earthquake, followed by a 45-foot tsunami, heavily damaged the nuclear power reactors at Japan's Fukushima Dai-ichi facility. Following this accident, the NRC required significant enhancements to U.S. commercial nuclear power plants.1

The enhancements included: adding capabilities to maintain key plant safety functions following a large-scale natural disaster; updating evaluations on the potential impact from seismic and flooding events; new equipment to better handle potential reactor core damage events; and strengthening emergency preparedness capabilities. Combined, these actions ensure that the nuclear industry and the NRC are prepared for the unexpected.

1 Although this information focuses on commercial nuclear power plants, the NRC considered the lessons of the accident for other types of nuclear facilities and required enhancements as appropriate.

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Page Last Reviewed/Updated Friday, January 04, 2019