It is useful to deal with the idea that nuclear is a CO2 free fuel. When the entire fuel cycle is considered then Nuclear power is a direct contributor to climate change emissions [i] .  It is then possible to add in additional carbon footprints such as the emissions caused by building and staffing a large plant.  It is also a question worth asking as to when climate change-related pollution became the only standard. There are plenty of other ways of polluting the environment and belching out irradiated gases into the ocean would seem to meet that standard.  [i]