Amazing footage - but don't believe the "no danger to public" message. We've already seen what happens when nuclear plants are inundated (see Fukushima). A 1993 flood at Nebraska's Cooper atomic reactor (an identical twin to Fukushima Daiichi Units 1 to 4 -- a GE BWR Mark 1), also on the Missouri River, caught plant operators flat-footed, and came precariously close to disabling safety significant systems, as well as spreading radioactive contamination. Severe weather, including floods, due to climate destabilization will make nuclear power ever more unsafe, unreliable, and untenable, as summarized in a Beyond Nuclear backgrounder.
A fire at Fort Calhoun, reported by John Sullivan at ProPublica, temporarily disrupted cooling in the plant's high-level radioactive waste storage pool. In just 88 hours without cooling water circulation, Fort Calhoun's storage pool would boil dry, and the high-level radioactive waste would catch on fire.