Yes they do ..the Tsunami caused leakage of spent isotope,rods that were never disposed of properly..so it's been leaking since then...into the pacific ocean contaminating it..and the airstream over North America.
It is leaking Radioiode..aka. I-131..a known cause of thyroid cancer..
Well what causes steam?
What causes heat
Got the answer yet?
Its Fooked, my best guess.
I'd say it's because there's radioactive hot water underneath a leak in the roof !!