Plutonium is a byproduct of nuclear reactions that is also part of the fuel mix at the plant 's No . 3 reactor . The material found is comparable to fallout from old nuclear reactors . Tokyo Electric says the material poses no risk to humans . But company says it will increase the ` ` just in case ''
The material found is comparable to fallout from old nuclear reactors . Tokyo Electric says the material poses no risk to humans . But company says it will increase the ` ` just in case ''