Why bring China here? This has been contentious for years and across many groups, both locals (e.g. japanese fishermen) and foreign (I don't see what gives China precedence over these concerns than any of these groups).

Though I'm no more of a nuclear waste expert than the next shitposter here, last I checked, the amount of radiation was well within safe levels (otherwise this option wouldn't be on the table), water is damn good at shielding against the effects of radiation (hence why almost all the fissile fuel is stored in some form of pool or another), and the active radioisotopes had a very short half-life (meaning that whatever impact it might still have today, it will be marginal a decade from now).

If that holds up against fact checking and scientific evidence, then by all means!