There have been quite a few nuclear accidents, and probably the worst one was the one in Russia, the 1986 Chernobyl disaster. It left a measurable contamination in a 15,000 square mile area that will last for 300 years!! Just think, that is a larger area than some of our states, in fact it is larger than nine of them.
There have been others. Three Mile Island was in Pennsylvania, but it was well contained, unlike the one at the Fukushima, Japan when it had a meltdown. In the area near it they found deformed butterflies and monkeys with a low red and white cell blood count. So, one may surmise that it had a bad influence on all life around the area. Not so, spiders seemed to benefit from the disaster, probably because the radiation slowed down the insects that they prey on. Also, there was a fungus that flourished since it contained melanin that helps convert gamma rays into energy. So, unless you are spider or a fungus, try not to get exposed to radiation and have a great day, you hear?