Fukushima has three 1000 percent meltdowns and catastrophic fuel pool fires that are significant players in the releases . Unit 3 aka Reactor 3 at Fukushima was using a mixture known as MOX FUEL .MOX FUEL is considered by media and experts to be 2 Million times worst than any other Reactor's Nuclear Cores Fuel on the planet only because it used MOX FUEL . MOX FUEL is not for power we don,t need those kind of isotopes to make energy , EVER. Power is a by product of the chain reaction.
Chernobyl by comparison was 1/3 the size of Unit 3 at Fukushima . Chernobyl's single Reactor was a 30 percent melt down and never had spent nuclear cores aka fuel rods or fuel pools above it that were Atomized & Aerosolized like Fukushima .
Reactor 3 at Fukushima had many spent insidiously dangerous nuclear cores sitting in the pools for many years cooling . THOSE FUEL POOLS ARE MISSING ALONG WITH THE NUCLEAR CORES THAT WERE STORED THERE !! Just because they were not going through the chain reaction at the time doesn,t mitigate their part in these equations of releases they have to always be factored into the models but have never been factored in .