The biggest environmental issue facing us today is radiation; from reactors, nuclear bombs, bomb sites, nuclear manufactures. Nuclear submarines, Uranium mines, waste shipments and by-products from all of the above and more.
The NRC states that small amounts of radiation are prevalent in the exhaust of the cooling systems. Furthermore, they state that it is considered safe as it's diluted into the oceans and air. Unfortunately the "hot shoots", hot water discharge does not always reach the oceans first, but rather it can accumulate in pools or is dammed up.
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