After the devastating earthquake and tsunami at Fukushima, Japan, the NRC required all U.S. nuclear power plants re-evaluate their flood vulnerability, with the evaluations to be completed within three years. GZA was retained to characterize flood hazards at 35 percent of U.S. nuclear power plants.
GZA introduced state-of-the-art technologies such as region-specific meteorology studies, probabilistic analysis of flooding due to storm surge, and hydrodynamic computer modeling for analysis and visualization of river, storm surge and waves, and local precipitation flooding.
GZA’s studies assessed the flood hazard of most U.S. major river watersheds, the Gulf of Mexico and the U.S. East Coast. Twenty-three power plants were evaluated in three years, meeting NRC’s schedule. The results are being used to assess the vulnerability of these critical facilities and to create flood mitigation measures and response plans.