Soaring temperatures, intensified flood risks and heightened water stress will threaten 57 U.S. nuclear plants over the next 20 years, forcing operators to take additional resiliency measures, according to a new report.

“The consequences of climate change can affect every aspect of nuclear plant operations—from fuel handling and power and steam generation to maintenance, safety systems and waste processing,” said the analysis, which was published yesterday by Moody’s Investors Service.