Anyone who thinks Fukushima and Chernobyl are the only nuclear disasters needing cleanup, and we're safe in the USA has really not studied the issue.
Hanford (in southeastern Washington State, USA) was closed down decades ago but isn't even close to being cleaned up. In fact, just a few years ago a major new underground water contamination was discovered that threatens the entire Columbia River system downstream -- all the way down to Portland, which is the largest city in Oregon.
Most reactors in the U.S. are built to less stringent standards than Fukushima was, and rely on rare (but historically proven to happen) events never happening, such as tsunamis or 9.0-strength earthquakes never occuring in the eastern U.S. which defies historic record. In 1811 and continuing into 1812, for instance, a series of earthquakes estimated to have been around 9.0 strength struck with their epicenters near the Kentucky/Missouri state borders; these quakes were so strong, in fact, they generated a tsunami on the Mississippi River, uplifting the terrain such that a portion of the river reversed course, backfilling and creating a (then) brand new permanent lake, now named Reelfoot Lake. Less than 60 years prior, in 1755 a similarly estimated 9.0-strength earthquake struck off the coast of Portugal in Europe, generating a tsunami that crossed the Atlantic, causing damage from Ireland to the Caribbean. Were a tsunami to strike anywhere in the Atlantic today, there would be no warning because the Atlantic ocean, unlike the Pacific, has no tsunami detection -- and, as mentioned, U.S. Atlantic seaboard cities and nuclear reactors (many of which are on rivers, as most nuclear reactors like Fukushima require water) are not designed to withstand even moderate earthquakes nor tsunamis. Even a heavy storm surge from a potent hurricane would be sufficient to essentially repeat the Fukushima disaster in many U.S. reactors, knocking out pumps and generators required to keep water flowing which is what keeps nuclear reactors from melting down (and this was the essential cause of the Fukushima disaster: the tsunami generated by the quake knocked out the water pumps, cutting off the essential water supply required to keep the reactor cool and with no cooling system, the Fukushima reactor melted down).