OMAHA, Neb. (AP) — Regulators have told the utilities that own Nebraska’s two nuclear power plants not to worry about some unlikely scenarios under which upstream dams might fail, even though regulator had ordered the utilities to study the flood risks facing the plants.

The Omaha and Nebraska Public Power Districts are re-examining flood threats at their nuclear plants that sit on the Missouri River as part of an industrywide review of unlikely safety threats after the 2011 meltdowns at the Fukushima Dai-ichi plant in Japan.