I have heard that this image surprises the viewers there [in the West]. They wonder why Japanese people, who experienced the atomic bombs, can swim in such a place, which is more or less likely to be contaminated: “What if the children drink that water?” They think that those Japanese are too careless. It is evident here: they are careless indeed.
Photo by Higuchi Kenji 樋口健二 (and his description, trans. Akai Yasuo)
I think the plant pictured is Mihama 美浜発電所