Just to be clear, they are dumping a few grams of a relatively benign element which is regularly & safely discharged into the ocean during the normal operations of nuclear facilities worldwide, diluted in an extremely large volume of seawater.
"it could affect all the life that live there and consequently human life that feeds of it" is not supported by any science, it's just fear, the same fear that leads us to keep running coal power plants that kill people on a daily basis.