> In not-so-ancient times "experts" were also OK with ocean disposal.
The link you gave did not list the effects of ocean disposal; elevated and measurable are not the same as significant or harmful unless you are a firm believer in LNT, although at the bottom of the ocean the background radiation dose from cosmic rays will be less.
Whatever they believe or not isn't impeding others' lifes.
The underlying point is about how much renewables and how much nuclear may we build in order to tackle current challenges (climate, pollution...), one of the criteria is waste and renewables win hands down.
> ocean disposal
AFAIK no expert now states that ocean disposal is OK, this is a settled matter since at least 1972 ( https://en.wikipedia.org/wiki/London_Convention_on_the_Preve... ), therefore a bunch of assessments of the current situation for stuff dangerous for at least hundred years doesn't seem pertinent to me.
> Whatever they believe or not isn't impeding others' lifes.
The principle is that we don't seek unanimity before proceeding with something.
> this is a settled matter since at least 1972
Disposal of small amounts of radioactive material at sea and into the air happens (e.g. reprocessing plant water releases, power station tritiated water releases).
An international convention does not settle the science behind ocean disposal. The lack of supporters perhaps reflects the difficulty in carrying out such research, and the problems of trying to change international agreements.
> we don't seek unanimity before proceeding with something.
> this is a settled matter since at least 1972
This is an opinion. My (dissenting) one is that the more someone is or could be impacted, the more we have to take his/her opinion into account.
> Disposal of small amounts of radioactive material at sea and into the air happens
It doesn't imply that it is an adequate way to dispose of it.
> An international convention does not settle the science behind ocean disposal
"The main objective of the London Convention is to prevent indiscriminate disposal at sea of wastes that could be liable for creating hazards to human health; harming living resources and marine life; damaging amenities; or interfering with other legitimate uses of the sea." ( https://en.wikipedia.org/wiki/London_Convention_on_the_Preve... )
> The lack of supporters perhaps reflects the difficulty in carrying out such research, and the problems of trying to change international agreements.
Nuclear-waste long-term repositories projects are very expensive and difficult (to the point of many attempts failing flat) everywhere, therefore attempting to convince that ocean-dumping is OK would be useful.
In not-so-ancient times "experts" were also OK with ocean disposal. https://en.wikipedia.org/wiki/Ocean_disposal_of_radioactive_...
AFAIK few experts now judge adequate to use such mines, and many nations build dedicated repositories.