Hi. There does not appear to be suitable tags available for nuclear reactors which are not power plants (scientific nuclear reactors, primarily). How can this be improved?
I don’t know: this is the one which I know best: https://www.openstreetmap.org/way/191447189.
Ideally tagging would allow many of the same tags which are used with power plants. The ILL reactor used to be about 57 MW (with current output on a large display in the Guide Hall). Additionally there are development reactors for both military & civil power (e.g., test reactors at Dounreay), and reactors used for generating medical isotopes.
Tentatively I’d suggest man_made=nuclear_reactor.
Should add there’s another former reactor just to the E of ILL https://fr.wikipedia.org/wiki/Silo%C3%A9_(r%C3%A9acteur)
There are also much lower power research reactors, housed in ordinary buildings.