I have only anecdotal experience about this but it may be helpful to share.
Growing up my family lived in a medium sized suburban area right around a lake and not far from a very large city center in the US. The lake is about 50 square miles and we were only 2 minutes away from the waterfront. The entire lake is man made and is used as a heatsink for a local nuclear plant. Thus this water is referred to as “nuclear waste”.
We swam in that water for a great many summer days and the lake is overall very popular, with waterfront property being several million USD depending on which part of the lake. We always joked that we’d eventually find a two-headed catfish but in all reality, that “waste” water has negligible if any radiation left in it. I think the only ‘significant’ byproduct of using it to cool the reactors was that the lake is just a small percentage of a degree warmer than it would be otherwise.
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