Fuel rods were found ejected 2 miles away from the site of the plant. Plutonium has been found aerosolized next to the plant and very radioactive isotopes heavier than uranium (ameresium) have been found as far away as New England!
He says this is evidence that the fuel became damaged and volatilized at Fukushima in the explosion at Unit 3. He says a hydrogen explosion, alone could not have caused this. He believes the hydrogen explosion triggered an atomic explosion from the fuel pool.