Originally Posted by
The Clint Eastwood
The Chernobyl plant exploded. That's a total meltdown. It released radioactive particles through a large blast radius, started radioactive forest fires, and released radioactive smoke into the atmosphere, spreading it for thousands of miles.
The area is safe now. It's been cleaned up, and although natural radiation levels for that area are higher than normal, it has little to no health hazard. Small exposure to low but unusual levels of radiation over long periods of time isn't dangerous. What is dangerous are high amounts of radiation exposure at once.
The Chernobyl incident was different, though. It wasn't caused by a power failure in cooling systems. It was caused by running the plant at high power on low power levels. There are ways to cool reactors without the cooling systems, such as liquid nitrogen, carbon dioxide, and various Halon substitutes.