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There's a certain amount of decay, but the active reaction has been stopped. The steam is from residual heat, which will be a problem for quite some time. The worst problem is with putting the emergency generators below the high water mark. The plant survived the earthquake and the tsunami. It was simple water damage to the generators that caused the disaster.
In Japan the radiation levels outside the plant are negligible. By the time you reach Tokyo they're nearly non-existent. In America you need very sensitive equipment to detect any change from normal background radiation.
And as for Radon in the basement, the most important safety equipment you need is good lighting, since the greatest danger is falling down the steps.
When I was young I had a radium dial watch and I rolled mercury around in my palm because it was fun to play with. I had no idea that I died a dozen times over form the toxic life I was living.
Claude