...radioactivity, and because of their ignorance and lack of a shred of scientific knowledge or ethical standing, value the death of say, ten people from radioactivity over tens of millions of people who die from other forms of pollution, the answer is probably "never."
Of course, I find people who think this way intellectually and morally appalling, but that's just me.
These sort of people think that every radioactive atom will tunnel right to their little brains and kill them. They're impossibly ignorant. This is amusing, since neurotransmission involves potassium channels, and all of the potassium on earth is radioactive, from the existence of primordial potassium 40. A 70 kg human being contains about 140 grams of potassium, which contains about 16 milligrams of potassium-40, the radioactive isotope, and as the specific activity of potassium-40, half-life 1.277 billion years, is 251,000 Bequerels per gram, this implies that every thinking and non-thinking person on earth has about 4,200 Bequerel in their flesh, much distributed to brain and nerve tissue.
Fat people like me are even more radioactive, since we contain more potassium than that.
As for the ocean, if one can do simple high school or college level nuclear calculations, one can calculate that the ocean contains about 530 billion curies of potassium-40, or 1.95 X 10^(22) Beq of this isotope, which ignores the radioactivity associated with the decay of the 4.5 billion tons of uranium the ocean contains. Anti-nuke ignorance, and the stupidity of the journalists who picked up on a story about a few atoms of Fukushima cesium in a tuna fish and made it into a international festival of Q-Anon quality paranoia, led to this highly amusing paper in the Proceedings of the National Academy of Sciences: Evaluation of radiation doses and associated risk from the Fukushima nuclear accident to marine biota and human consumers of seafood (Madigan et al., PNAS June 25, 2013 110 (26) 10670-1067). They were responding to the hula boo raised by more than 1000 newspaper articles that covered their fine original paper, which used Cs-134 released by the reactors as a tracer for Tuna migrations, much as cesium-137 from Cold War atmospheric nuclear testing is used as a tracer for soil erosion related to modern agriculture.
I hope I gave you the answer to the question you asked and did so while speaking the language of the dumb assed anti-nukes who are killing the planet by their selective attention.
Now I have a question for you:
When do you think the mercury released by the last 100 years of coal burning, fifty years of which was unnecessary since nuclear energy was commercialized, will stop poisoning the planet?
Any idea?
I read articles in every issue several of the major scientific environmental journals and write articles here about my readings which may be found in my journal, not all of which are about nuclear fuel, although many are, since nuclear fuels are a subject in which I certainly qualify as an expert, as I've been studying them on my free time for over three decades.
It is rare that the contents pages of an issue doesn't contain reference to mercury pollution. If one searches, uses the search terms "mercury" and "environment" in Google Scholar, one gets more than 2.5 million hits in about 70 milliseconds.
Since I care about the environment, and have spent nearly my entire adult life - I'm an old man - thinking and reading about it, I often muse to myself that the reason that people engage Trumpism and similar appeals to ignorance is related to the fact that no one has given a rat's ass about mercury, a well known neurotoxin that can lead to insanity. (This effect famously accounts for the "Mad Hatter" character in Alice in Wonderland, a region in which all of us are now living.) Certainly anti-nukism is insane, perhaps as insane as Trumpism.
As it happens, before the rise of coal use - which has been the fastest rising source of primary energy on this planet in the 21st century - most of the world's mercury was sequestered as mercury sulfide, the mineral known as cinnabar, which can be made to release mercury by heating. In our mad quest to use up all of the world's best ores to rob all future generations of a shred of a chance of leading satisfying lives, we have oxidized almost all of the sulfides on this planet to sulfuric acid.
We're wonderful people, and we love to brag about how "green" we are.
Of course, "green" can be another word for "rube."
History will not forgive us, nor should it.
Have a nice weekend.
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