Not to be rude but I think you're highly overestimating the effects this could have globally. The ocean is really big, and it's not like radioactivity is contagious. As for the local effects, who knows...

EDIT: by who knows, I just mean I'm not aware of the scale, I could imagine it getting pretty bad. It's just that with all the sensationalism and non comprehension of basic statistics in some articles, I feel pretty misinformed on the subject.