Not a nuke tech but I do have a little knowledge on what happens to the water.
I am sure the water is ran through a system to filter it out. Like reverse osmosis, when water is contaminated with chemicals and such is is then ran though a ROWPU (reverse osmosis water purification unit) unit to cleanse.
Not saying that this is what they are doing but....more then likely. I cant see anyone being that stupid as to release radiation into the sea. But who knows, common sense is not a job requirement for most places.
