Fukushima [has] ... pumped out huge amounts of radioactive iodine 129 – which has a half-life of 15.7 million years. Fukushima has also dumped up to 900 trillion becquerels of radioactive strontium-90 – which is a powerful internal emitter which mimics calcium and collects in our bones – into the ocean. And the amount of radioactive fuel at Fukushima dwarfs Chernobyl … and so could keep leaking for decades, centuries or millennia.
TEPCO graphics of the Fukushima plants even appear to show water directly flowing from the plant to the ocean.
The bottom line is that the reactors have lost containment. There are not “some leaks” at Fukushima. “Leaks” imply that the reactor cores are safely in their containment buildings, and there is a small hole or two which need to be plugged. But scientists don’t even know where the cores of the reactors are. That’s not leaking. That’s even worse than a total meltdown.